Fail - Unable to verify

[0xZXDX]

Describe the bug

Fail - Unable to verify

Steps To Reproduce

$ npx truffle migrate --network ftmtestnet

Compiling your contracts...
===========================
✔ Fetching solc version list from solc-bin. Attempt #1
✔ Fetching solc version list from solc-bin. Attempt #1
> Everything is up to date, there is nothing to compile.

Starting migrations...
======================
> Network name:    'ftmtestnet'
> Network id:      4002
> Block gas limit: 281474976710655 (0xffffffffffff)

1_initial_migration.js
======================

   Deploying 'Migrations'
   ----------------------
   > transaction hash:    0xc5d4145d5e443464a716d6f1ce61a8c1e8743f0468fc9ede456b790e3e62bb20
   > Blocks: 0            Seconds: 0
   > contract address:    0x21BBb6AF1f908895183d12Bd4b27c45A35807cC7
   > block number:        7452344
   > block timestamp:     1644494088
   > account:             0x3247EA903162fB3CD5B612D4F0AcA92e6Eb623BD
   > balance:             67.7886381087932
   > gas used:            159090 (0x26d72)
   > gas price:           200.0144 gwei
   > value sent:          0 ETH
   > total cost:          0.031820290896 ETH

   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:      0.031820290896 ETH

2_deploy_rarity.js
==================

   Deploying 'core_rarity'
   -----------------------
   > transaction hash:    0x2e828ea911ed5b5db12c456911da8f498ad5ebb2d0e9aa48d7e26ffb48872ddd
   > Blocks: 0            Seconds: 0
   > contract address:    0x2586f25c1e9a2bd8bE5AAE502761c4C5D62a3eD9
   > block number:        7452348
   > block timestamp:     1644494092
   > account:             0x3247EA903162fB3CD5B612D4F0AcA92e6Eb623BD
   > balance:             67.3603002706892
   > gas used:            2094703 (0x1ff66f)
   > gas price:           200.0144 gwei
   > value sent:          0 ETH
   > total cost:          0.4189707637232 ETH

   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:     0.4189707637232 ETH

Summary
=======
> Total deployments:   2
> Final cost:          0.4507910546192 ETH

$ npx truffle run verify core_rarity --network ftmtestnet --debug
DEBUG logging is turned ON
Running truffle-plugin-verify v0.5.21
Retrieving network's chain ID
Verifying core_rarity
Reading artifact file at xxx/WorkSpaces/rarity/build/contracts/core_rarity.json
Retrieving constructor parameters from https://api-testnet.ftmscan.com/api?apiKey=xxx&module=account&action=txlist&address=0x2586f25c1e9a2bd8bE5AAE502761c4C5D62a3eD9&page=1&sort=asc&offset=1
Constructor parameters retrieved: 0x
Sending verify request with POST arguments:
{
  "apikey": "xxx",
  "module": "contract",
  "action": "verifysourcecode",
  "contractaddress": "0x2586f25c1e9a2bd8bE5AAE502761c4C5D62a3eD9",
  "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/contracts/core/rarity.sol\":{\"content\":\"/**\\n *Submitted for verification at FtmScan.com on 2021-09-05\\n*/\\n\\n// SPDX-License-Identifier: MIT\\npragma solidity ^0.8.7;\\n\\ninterface ICoreRarityERC721 {\\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\\n\\n    function balanceOf(address owner) external view returns (uint256 balance);\\n\\n    function ownerOf(uint256 tokenId) external view returns (address owner);\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) external;\\n\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) external;\\n\\n    function approve(address to, uint256 tokenId) external;\\n\\n    function getApproved(uint256 tokenId) external view returns (address operator);\\n\\n    function setApprovalForAll(address operator, bool _approved) external;\\n\\n    function isApprovedForAll(address owner, address operator) external view returns (bool);\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes calldata data\\n    ) external;\\n}\\n\\nlibrary LCoreRarityStrings {\\n    function toString(uint256 value) internal pure returns (string memory) {\\n        if (value == 0) {\\n            return \\\"0\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 digits;\\n        while (temp != 0) {\\n            digits++;\\n            temp /= 10;\\n        }\\n        bytes memory buffer = new bytes(digits);\\n        while (value != 0) {\\n            digits -= 1;\\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\\n            value /= 10;\\n        }\\n        return string(buffer);\\n    }\\n}\\n\\ninterface ICoreRarityERC721Receiver {\\n    function onERC721Received(\\n        address operator,\\n        address from,\\n        uint256 tokenId,\\n        bytes calldata data\\n    ) external returns (bytes4);\\n}\\n\\ncontract CoreRarityERC721 is ICoreRarityERC721 {\\n    using LCoreRarityStrings for uint256;\\n\\n    mapping(uint256 => address) private _owners;\\n    mapping(address => uint256) private _balances;\\n    mapping(uint256 => address) private _tokenApprovals;\\n    mapping(address => mapping(address => bool)) private _operatorApprovals;\\n\\n    function balanceOf(address owner) public view virtual override returns (uint256) {\\n        require(owner != address(0), \\\"ERC721: balance query for the zero address\\\");\\n        return _balances[owner];\\n    }\\n\\n    function ownerOf(uint256 tokenId) public view virtual override returns (address) {\\n        address owner = _owners[tokenId];\\n        require(owner != address(0), \\\"ERC721: owner query for nonexistent token\\\");\\n        return owner;\\n    }\\n\\n    function _baseURI() internal view virtual returns (string memory) {\\n        return \\\"\\\";\\n    }\\n\\n    function approve(address to, uint256 tokenId) public virtual override {\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n        require(to != owner, \\\"ERC721: approval to current owner\\\");\\n\\n        require(\\n            msg.sender == owner || isApprovedForAll(owner, msg.sender),\\n            \\\"ERC721: approve caller is not owner nor approved for all\\\"\\n        );\\n\\n        _approve(to, tokenId);\\n    }\\n\\n    function getApproved(uint256 tokenId) public view virtual override returns (address) {\\n        require(_exists(tokenId), \\\"ERC721: approved query for nonexistent token\\\");\\n\\n        return _tokenApprovals[tokenId];\\n    }\\n\\n    function setApprovalForAll(address operator, bool approved) public virtual override {\\n        require(operator != msg.sender, \\\"ERC721: approve to caller\\\");\\n\\n        _operatorApprovals[msg.sender][operator] = approved;\\n        emit ApprovalForAll(msg.sender, operator, approved);\\n    }\\n\\n    function _isContract(address account) internal view returns (bool) {\\n        uint256 size;\\n        assembly {\\n            size := extcodesize(account)\\n        }\\n        return size > 0;\\n    }\\n\\n    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\\n        return _operatorApprovals[owner][operator];\\n    }\\n\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) public virtual override {\\n        //solhint-disable-next-line max-line-length\\n        require(_isApprovedOrOwner(msg.sender, tokenId), \\\"ERC721: transfer caller is not owner nor approved\\\");\\n\\n        _transfer(from, to, tokenId);\\n    }\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) public virtual override {\\n        safeTransferFrom(from, to, tokenId, \\\"\\\");\\n    }\\n\\n    /**\\n     * @dev See {IERC721-safeTransferFrom}.\\n     */\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) public virtual override {\\n        require(_isApprovedOrOwner(msg.sender, tokenId), \\\"ERC721: transfer caller is not owner nor approved\\\");\\n        _safeTransfer(from, to, tokenId, _data);\\n    }\\n\\n    /**\\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\\n     *\\n     * `_data` is additional data, it has no specified format and it is sent in call to `to`.\\n     *\\n     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     * - `tokenId` token must exist and be owned by `from`.\\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _safeTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) internal virtual {\\n        _transfer(from, to, tokenId);\\n        require(_checkOnERC721Received(from, to, tokenId, _data), \\\"ERC721: transfer to non ERC721Receiver implementer\\\");\\n    }\\n\\n    /**\\n     * @dev Returns whether `tokenId` exists.\\n     *\\n     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\\n     *\\n     * Tokens start existing when they are minted (`_mint`),\\n     * and stop existing when they are burned (`_burn`).\\n     */\\n    function _exists(uint256 tokenId) internal view virtual returns (bool) {\\n        return _owners[tokenId] != address(0);\\n    }\\n\\n    /**\\n     * @dev Returns whether `spender` is allowed to manage `tokenId`.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must exist.\\n     */\\n    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {\\n        require(_exists(tokenId), \\\"ERC721: operator query for nonexistent token\\\");\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));\\n    }\\n\\n    /**\\n     * @dev Safely mints `tokenId` and transfers it to `to`.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must not exist.\\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _safeMint(address to, uint256 tokenId) internal virtual {\\n        _safeMint(to, tokenId, \\\"\\\");\\n    }\\n\\n    /**\\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\\n     */\\n    function _safeMint(\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) internal virtual {\\n        _mint(to, tokenId);\\n        require(\\n            _checkOnERC721Received(address(0), to, tokenId, _data),\\n            \\\"ERC721: transfer to non ERC721Receiver implementer\\\"\\n        );\\n    }\\n\\n    /**\\n     * @dev Mints `tokenId` and transfers it to `to`.\\n     *\\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must not exist.\\n     * - `to` cannot be the zero address.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _mint(address to, uint256 tokenId) internal virtual {\\n        require(to != address(0), \\\"ERC721: mint to the zero address\\\");\\n        require(!_exists(tokenId), \\\"ERC721: token already minted\\\");\\n\\n        _beforeTokenTransfer(address(0), to, tokenId);\\n\\n        _balances[to] += 1;\\n        _owners[tokenId] = to;\\n\\n        emit Transfer(address(0), to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Destroys `tokenId`.\\n     * The approval is cleared when the token is burned.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must exist.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _burn(uint256 tokenId) internal virtual {\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n\\n        _beforeTokenTransfer(owner, address(0), tokenId);\\n\\n        // Clear approvals\\n        _approve(address(0), tokenId);\\n\\n        _balances[owner] -= 1;\\n        delete _owners[tokenId];\\n\\n        emit Transfer(owner, address(0), tokenId);\\n    }\\n\\n    /**\\n     * @dev Transfers `tokenId` from `from` to `to`.\\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\\n     *\\n     * Requirements:\\n     *\\n     * - `to` cannot be the zero address.\\n     * - `tokenId` token must be owned by `from`.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _transfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual {\\n        require(CoreRarityERC721.ownerOf(tokenId) == from, \\\"ERC721: transfer of token that is not own\\\");\\n        require(to != address(0), \\\"ERC721: transfer to the zero address\\\");\\n\\n        _beforeTokenTransfer(from, to, tokenId);\\n\\n        // Clear approvals from the previous owner\\n        _approve(address(0), tokenId);\\n\\n        _balances[from] -= 1;\\n        _balances[to] += 1;\\n        _owners[tokenId] = to;\\n\\n        emit Transfer(from, to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Approve `to` to operate on `tokenId`\\n     *\\n     * Emits a {Approval} event.\\n     */\\n    function _approve(address to, uint256 tokenId) internal virtual {\\n        _tokenApprovals[tokenId] = to;\\n        emit Approval(CoreRarityERC721.ownerOf(tokenId), to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\\n     * The call is not executed if the target address is not a contract.\\n     *\\n     * @param from address representing the previous owner of the given token ID\\n     * @param to target address that will receive the tokens\\n     * @param tokenId uint256 ID of the token to be transferred\\n     * @param _data bytes optional data to send along with the call\\n     * @return bool whether the call correctly returned the expected magic value\\n     */\\n    function _checkOnERC721Received(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) private returns (bool) {\\n        if (_isContract(to)) {\\n            try ICoreRarityERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {\\n                return retval == ICoreRarityERC721Receiver(to).onERC721Received.selector;\\n            } catch (bytes memory reason) {\\n                if (reason.length == 0) {\\n                    revert(\\\"ERC721: transfer to non ERC721Receiver implementer\\\");\\n                } else {\\n                    assembly {\\n                        revert(add(32, reason), mload(reason))\\n                    }\\n                }\\n            }\\n        } else {\\n            return true;\\n        }\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any token transfer. This includes minting\\n     * and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\\n     * transferred to `to`.\\n     * - When `from` is zero, `tokenId` will be minted for `to`.\\n     * - When `to` is zero, ``from``'s `tokenId` will be burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual {}\\n}\\n\\n\\n\\n\\n\\n\\n\\n/**\\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\\n * @dev See https://eips.ethereum.org/EIPS/eip-721\\n */\\ninterface ICoreRarityERC721Enumerable is ICoreRarityERC721 {\\n    /**\\n     * @dev Returns the total amount of tokens stored by the contract.\\n     */\\n    function totalSupply() external view returns (uint256);\\n\\n    /**\\n     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\\n     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\\n     */\\n    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);\\n\\n    /**\\n     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\\n     * Use along with {totalSupply} to enumerate all tokens.\\n     */\\n    function tokenByIndex(uint256 index) external view returns (uint256);\\n}\\n\\n\\n/**\\n * @dev This implements an optional extension of {ERC721} defined in the EIP that adds\\n * enumerability of all the token ids in the contract as well as all token ids owned by each\\n * account.\\n */\\nabstract contract CoreRarityERC721Enumerable is CoreRarityERC721, ICoreRarityERC721Enumerable {\\n    // Mapping from owner to list of owned token IDs\\n    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;\\n\\n    // Mapping from token ID to index of the owner tokens list\\n    mapping(uint256 => uint256) private _ownedTokensIndex;\\n\\n    // Array with all token ids, used for enumeration\\n    uint256[] private _allTokens;\\n\\n    // Mapping from token id to position in the allTokens array\\n    mapping(uint256 => uint256) private _allTokensIndex;\\n\\n    /**\\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\\n     */\\n    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {\\n        require(index < CoreRarityERC721.balanceOf(owner), \\\"ERC721Enumerable: owner index out of bounds\\\");\\n        return _ownedTokens[owner][index];\\n    }\\n\\n    /**\\n     * @dev See {IERC721Enumerable-totalSupply}.\\n     */\\n    function totalSupply() public view virtual override returns (uint256) {\\n        return _allTokens.length;\\n    }\\n\\n    /**\\n     * @dev See {IERC721Enumerable-tokenByIndex}.\\n     */\\n    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {\\n        require(index < CoreRarityERC721Enumerable.totalSupply(), \\\"ERC721Enumerable: global index out of bounds\\\");\\n        return _allTokens[index];\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any token transfer. This includes minting\\n     * and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\\n     * transferred to `to`.\\n     * - When `from` is zero, `tokenId` will be minted for `to`.\\n     * - When `to` is zero, ``from``'s `tokenId` will be burned.\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual override {\\n        super._beforeTokenTransfer(from, to, tokenId);\\n\\n        if (from == address(0)) {\\n            _addTokenToAllTokensEnumeration(tokenId);\\n        } else if (from != to) {\\n            _removeTokenFromOwnerEnumeration(from, tokenId);\\n        }\\n        if (to == address(0)) {\\n            _removeTokenFromAllTokensEnumeration(tokenId);\\n        } else if (to != from) {\\n            _addTokenToOwnerEnumeration(to, tokenId);\\n        }\\n    }\\n\\n    /**\\n     * @dev Private function to add a token to this extension's ownership-tracking data structures.\\n     * @param to address representing the new owner of the given token ID\\n     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address\\n     */\\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\\n        uint256 length = CoreRarityERC721.balanceOf(to);\\n        _ownedTokens[to][length] = tokenId;\\n        _ownedTokensIndex[tokenId] = length;\\n    }\\n\\n    /**\\n     * @dev Private function to add a token to this extension's token tracking data structures.\\n     * @param tokenId uint256 ID of the token to be added to the tokens list\\n     */\\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\\n        _allTokensIndex[tokenId] = _allTokens.length;\\n        _allTokens.push(tokenId);\\n    }\\n\\n    /**\\n     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\\n     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\\n     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).\\n     * This has O(1) time complexity, but alters the order of the _ownedTokens array.\\n     * @param from address representing the previous owner of the given token ID\\n     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\\n     */\\n    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\\n        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\\n        // then delete the last slot (swap and pop).\\n\\n        uint256 lastTokenIndex = CoreRarityERC721.balanceOf(from) - 1;\\n        uint256 tokenIndex = _ownedTokensIndex[tokenId];\\n\\n        // When the token to delete is the last token, the swap operation is unnecessary\\n        if (tokenIndex != lastTokenIndex) {\\n            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\\n\\n            _ownedTokens[from][tokenIndex] = lastTokenId;\\n            // Move the last token to the slot of the to-delete token\\n            _ownedTokensIndex[lastTokenId] = tokenIndex;\\n            // Update the moved token's index\\n        }\\n\\n        // This also deletes the contents at the last position of the array\\n        delete _ownedTokensIndex[tokenId];\\n        delete _ownedTokens[from][lastTokenIndex];\\n    }\\n\\n    /**\\n     * @dev Private function to remove a token from this extension's token tracking data structures.\\n     * This has O(1) time complexity, but alters the order of the _allTokens array.\\n     * @param tokenId uint256 ID of the token to be removed from the tokens list\\n     */\\n    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\\n        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\\n        // then delete the last slot (swap and pop).\\n\\n        uint256 lastTokenIndex = _allTokens.length - 1;\\n        uint256 tokenIndex = _allTokensIndex[tokenId];\\n\\n        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\\n        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\\n        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\\n        uint256 lastTokenId = _allTokens[lastTokenIndex];\\n\\n        _allTokens[tokenIndex] = lastTokenId;\\n        // Move the last token to the slot of the to-delete token\\n        _allTokensIndex[lastTokenId] = tokenIndex;\\n        // Update the moved token's index\\n\\n        // This also deletes the contents at the last position of the array\\n        delete _allTokensIndex[tokenId];\\n        _allTokens.pop();\\n    }\\n}\\n\\ncontract core_rarity is CoreRarityERC721Enumerable {\\n    uint public next_summoner;\\n    uint constant xp_per_day = 250e18;\\n    uint constant DAY = 1 days;\\n\\n    string constant name = \\\"Rarity Manifested\\\";\\n    string constant symbol = \\\"RM\\\";\\n\\n    mapping(uint => uint) public xp;\\n    mapping(uint => uint) public adventurers_log;\\n    mapping(uint => uint) public class;\\n    mapping(uint => uint) public level;\\n\\n    event summoned(address indexed owner, uint class, uint summoner);\\n    event leveled(address indexed owner, uint level, uint summoner);\\n\\n    function adventure(uint _summoner) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        require(block.timestamp > adventurers_log[_summoner]);\\n        adventurers_log[_summoner] = block.timestamp + DAY;\\n        xp[_summoner] += xp_per_day;\\n    }\\n\\n    function spend_xp(uint _summoner, uint _xp) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        xp[_summoner] -= _xp;\\n    }\\n\\n    function level_up(uint _summoner) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        uint _level = level[_summoner];\\n        uint _xp_required = xp_required(_level);\\n        xp[_summoner] -= _xp_required;\\n        level[_summoner] = _level + 1;\\n        emit leveled(msg.sender, level[_summoner], _summoner);\\n    }\\n\\n    function summoner(uint _summoner) external view returns (uint _xp, uint _log, uint _class, uint _level) {\\n        _xp = xp[_summoner];\\n        _log = adventurers_log[_summoner];\\n        _class = class[_summoner];\\n        _level = level[_summoner];\\n    }\\n\\n    function summon(uint _class) external {\\n        require(1 <= _class && _class <= 11);\\n        uint _next_summoner = next_summoner;\\n        class[_next_summoner] = _class;\\n        level[_next_summoner] = 1;\\n        _safeMint(msg.sender, _next_summoner);\\n        emit summoned(msg.sender, _class, _next_summoner);\\n        next_summoner++;\\n    }\\n\\n    function xp_required(uint curent_level) public pure returns (uint xp_to_next_level) {\\n        xp_to_next_level = curent_level * 1000e18;\\n        for (uint i = 1; i < curent_level; i++) {\\n            xp_to_next_level += curent_level * 1000e18;\\n        }\\n    }\\n\\n    function tokenURI(uint256 _summoner) public view returns (string memory) {\\n        string[7] memory parts;\\n        parts[0] = '<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" preserveAspectRatio=\\\"xMinYMin meet\\\" viewBox=\\\"0 0 350 350\\\"><style>.base { fill: white; font-family: serif; font-size: 14px; }</style><rect width=\\\"100%\\\" height=\\\"100%\\\" fill=\\\"black\\\" /><text x=\\\"10\\\" y=\\\"20\\\" class=\\\"base\\\">';\\n\\n        parts[1] = string(abi.encodePacked(\\\"class\\\", \\\" \\\", classes(class[_summoner])));\\n\\n        parts[2] = '</text><text x=\\\"10\\\" y=\\\"40\\\" class=\\\"base\\\">';\\n\\n        parts[3] = string(abi.encodePacked(\\\"level\\\", \\\" \\\", toString(level[_summoner])));\\n\\n        parts[4] = '</text><text x=\\\"10\\\" y=\\\"60\\\" class=\\\"base\\\">';\\n\\n        parts[5] = string(abi.encodePacked(\\\"xp\\\", \\\" \\\", toString(xp[_summoner] / 1e18)));\\n\\n        parts[6] = '</text></svg>';\\n\\n        string memory output = string(abi.encodePacked(parts[0], parts[1], parts[2], parts[3], parts[4], parts[5], parts[6]));\\n\\n        string memory json = LCoreRarityBase64.encode(bytes(string(abi.encodePacked('{\\\"name\\\": \\\"summoner #', toString(_summoner), '\\\", \\\"description\\\": \\\"Rarity is achieved via an active economy, summoners must level, gain feats, learn spells, to be able to craft gear. This allows for market driven rarity while allowing an ever growing economy. Feats, spells, and summoner gear is ommitted as part of further expansions.\\\", \\\"image\\\": \\\"data:image/svg+xml;base64,', LCoreRarityBase64.encode(bytes(output)), '\\\"}'))));\\n        output = string(abi.encodePacked('data:application/json;base64,', json));\\n\\n        return output;\\n    }\\n\\n    function classes(uint id) public pure returns (string memory description) {\\n        if (id == 1) {\\n            return \\\"Barbarian\\\";\\n        } else if (id == 2) {\\n            return \\\"Bard\\\";\\n        } else if (id == 3) {\\n            return \\\"Cleric\\\";\\n        } else if (id == 4) {\\n            return \\\"Druid\\\";\\n        } else if (id == 5) {\\n            return \\\"Fighter\\\";\\n        } else if (id == 6) {\\n            return \\\"Monk\\\";\\n        } else if (id == 7) {\\n            return \\\"Paladin\\\";\\n        } else if (id == 8) {\\n            return \\\"Ranger\\\";\\n        } else if (id == 9) {\\n            return \\\"Rogue\\\";\\n        } else if (id == 10) {\\n            return \\\"Sorcerer\\\";\\n        } else if (id == 11) {\\n            return \\\"Wizard\\\";\\n        }\\n    }\\n\\n    function toString(uint256 value) internal pure returns (string memory) {\\n        // Inspired by OraclizeAPI's implementation - MIT license\\n        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\\n\\n        if (value == 0) {\\n            return \\\"0\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 digits;\\n        while (temp != 0) {\\n            digits++;\\n            temp /= 10;\\n        }\\n        bytes memory buffer = new bytes(digits);\\n        while (value != 0) {\\n            digits -= 1;\\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\\n            value /= 10;\\n        }\\n        return string(buffer);\\n    }\\n}\\n\\n/// [MIT License]\\n/// @title Base64\\n/// @notice Provides a function for encoding some bytes in base64\\n/// @author Brecht Devos <brecht@loopring.org>\\nlibrary LCoreRarityBase64 {\\n    bytes internal constant TABLE = \\\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\\\";\\n\\n    /// @notice Encodes some bytes to the base64 representation\\n    function encode(bytes memory data) internal pure returns (string memory) {\\n        uint256 len = data.length;\\n        if (len == 0) return \\\"\\\";\\n\\n        // multiply by 4/3 rounded up\\n        uint256 encodedLen = 4 * ((len + 2) / 3);\\n\\n        // Add some extra buffer at the end\\n        bytes memory result = new bytes(encodedLen + 32);\\n\\n        bytes memory table = TABLE;\\n\\n        assembly {\\n            let tablePtr := add(table, 1)\\n            let resultPtr := add(result, 32)\\n\\n            for {\\n                let i := 0\\n            } lt(i, len) {\\n\\n            } {\\n                i := add(i, 3)\\n                let input := and(mload(add(data, i)), 0xffffff)\\n\\n                let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))\\n                out := shl(224, out)\\n\\n                mstore(resultPtr, out)\\n\\n                resultPtr := add(resultPtr, 4)\\n            }\\n\\n            switch mod(len, 3)\\n            case 1 {\\n                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))\\n            }\\n            case 2 {\\n                mstore(sub(resultPtr, 1), shl(248, 0x3d))\\n            }\\n\\n            mstore(result, encodedLen)\\n        }\\n\\n        return string(result);\\n    }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":true,\"runs\":200},\"evmVersion\":\"london\",\"libraries\":{}}}",
  "codeformat": "solidity-standard-json-input",
  "contractname": "/contracts/core/rarity.sol:core_rarity",
  "compilerversion": "v0.8.11+commit.d7f03943",
  "constructorArguements": ""
}
Checking status of verification request 6y4qps2xisgtp78bnv3xti6thsapxxujb1brj5mdid42bxaxqf
Fail - Unable to verify
Failed to verify 1 contract(s): core_rarity

Environment information

• Operating System: (macOS 12.2)
• Node version: (v16.13.1)
• Truffle version: (v5.4.30)
• truffle-plugin-verify version: (0.5.21)

Debug output

$ npx truffle run verify core_rarity --network ftmtestnet --debug
DEBUG logging is turned ON
Running truffle-plugin-verify v0.5.21
Retrieving network's chain ID
Verifying core_rarity
Reading artifact file at xxx/WorkSpaces/rarity/build/contracts/core_rarity.json
Retrieving constructor parameters from https://api-testnet.ftmscan.com/api?apiKey=xxx&module=account&action=txlist&address=0x2586f25c1e9a2bd8bE5AAE502761c4C5D62a3eD9&page=1&sort=asc&offset=1
Constructor parameters retrieved: 0x
Sending verify request with POST arguments:
{
  "apikey": "xxx",
  "module": "contract",
  "action": "verifysourcecode",
  "contractaddress": "0x2586f25c1e9a2bd8bE5AAE502761c4C5D62a3eD9",
  "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/contracts/core/rarity.sol\":{\"content\":\"/**\\n *Submitted for verification at FtmScan.com on 2021-09-05\\n*/\\n\\n// SPDX-License-Identifier: MIT\\npragma solidity ^0.8.7;\\n\\ninterface ICoreRarityERC721 {\\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\\n\\n    function balanceOf(address owner) external view returns (uint256 balance);\\n\\n    function ownerOf(uint256 tokenId) external view returns (address owner);\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) external;\\n\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) external;\\n\\n    function approve(address to, uint256 tokenId) external;\\n\\n    function getApproved(uint256 tokenId) external view returns (address operator);\\n\\n    function setApprovalForAll(address operator, bool _approved) external;\\n\\n    function isApprovedForAll(address owner, address operator) external view returns (bool);\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes calldata data\\n    ) external;\\n}\\n\\nlibrary LCoreRarityStrings {\\n    function toString(uint256 value) internal pure returns (string memory) {\\n        if (value == 0) {\\n            return \\\"0\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 digits;\\n        while (temp != 0) {\\n            digits++;\\n            temp /= 10;\\n        }\\n        bytes memory buffer = new bytes(digits);\\n        while (value != 0) {\\n            digits -= 1;\\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\\n            value /= 10;\\n        }\\n        return string(buffer);\\n    }\\n}\\n\\ninterface ICoreRarityERC721Receiver {\\n    function onERC721Received(\\n        address operator,\\n        address from,\\n        uint256 tokenId,\\n        bytes calldata data\\n    ) external returns (bytes4);\\n}\\n\\ncontract CoreRarityERC721 is ICoreRarityERC721 {\\n    using LCoreRarityStrings for uint256;\\n\\n    mapping(uint256 => address) private _owners;\\n    mapping(address => uint256) private _balances;\\n    mapping(uint256 => address) private _tokenApprovals;\\n    mapping(address => mapping(address => bool)) private _operatorApprovals;\\n\\n    function balanceOf(address owner) public view virtual override returns (uint256) {\\n        require(owner != address(0), \\\"ERC721: balance query for the zero address\\\");\\n        return _balances[owner];\\n    }\\n\\n    function ownerOf(uint256 tokenId) public view virtual override returns (address) {\\n        address owner = _owners[tokenId];\\n        require(owner != address(0), \\\"ERC721: owner query for nonexistent token\\\");\\n        return owner;\\n    }\\n\\n    function _baseURI() internal view virtual returns (string memory) {\\n        return \\\"\\\";\\n    }\\n\\n    function approve(address to, uint256 tokenId) public virtual override {\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n        require(to != owner, \\\"ERC721: approval to current owner\\\");\\n\\n        require(\\n            msg.sender == owner || isApprovedForAll(owner, msg.sender),\\n            \\\"ERC721: approve caller is not owner nor approved for all\\\"\\n        );\\n\\n        _approve(to, tokenId);\\n    }\\n\\n    function getApproved(uint256 tokenId) public view virtual override returns (address) {\\n        require(_exists(tokenId), \\\"ERC721: approved query for nonexistent token\\\");\\n\\n        return _tokenApprovals[tokenId];\\n    }\\n\\n    function setApprovalForAll(address operator, bool approved) public virtual override {\\n        require(operator != msg.sender, \\\"ERC721: approve to caller\\\");\\n\\n        _operatorApprovals[msg.sender][operator] = approved;\\n        emit ApprovalForAll(msg.sender, operator, approved);\\n    }\\n\\n    function _isContract(address account) internal view returns (bool) {\\n        uint256 size;\\n        assembly {\\n            size := extcodesize(account)\\n        }\\n        return size > 0;\\n    }\\n\\n    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\\n        return _operatorApprovals[owner][operator];\\n    }\\n\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) public virtual override {\\n        //solhint-disable-next-line max-line-length\\n        require(_isApprovedOrOwner(msg.sender, tokenId), \\\"ERC721: transfer caller is not owner nor approved\\\");\\n\\n        _transfer(from, to, tokenId);\\n    }\\n\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) public virtual override {\\n        safeTransferFrom(from, to, tokenId, \\\"\\\");\\n    }\\n\\n    /**\\n     * @dev See {IERC721-safeTransferFrom}.\\n     */\\n    function safeTransferFrom(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) public virtual override {\\n        require(_isApprovedOrOwner(msg.sender, tokenId), \\\"ERC721: transfer caller is not owner nor approved\\\");\\n        _safeTransfer(from, to, tokenId, _data);\\n    }\\n\\n    /**\\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\\n     *\\n     * `_data` is additional data, it has no specified format and it is sent in call to `to`.\\n     *\\n     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     * - `tokenId` token must exist and be owned by `from`.\\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _safeTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) internal virtual {\\n        _transfer(from, to, tokenId);\\n        require(_checkOnERC721Received(from, to, tokenId, _data), \\\"ERC721: transfer to non ERC721Receiver implementer\\\");\\n    }\\n\\n    /**\\n     * @dev Returns whether `tokenId` exists.\\n     *\\n     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\\n     *\\n     * Tokens start existing when they are minted (`_mint`),\\n     * and stop existing when they are burned (`_burn`).\\n     */\\n    function _exists(uint256 tokenId) internal view virtual returns (bool) {\\n        return _owners[tokenId] != address(0);\\n    }\\n\\n    /**\\n     * @dev Returns whether `spender` is allowed to manage `tokenId`.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must exist.\\n     */\\n    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {\\n        require(_exists(tokenId), \\\"ERC721: operator query for nonexistent token\\\");\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));\\n    }\\n\\n    /**\\n     * @dev Safely mints `tokenId` and transfers it to `to`.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must not exist.\\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _safeMint(address to, uint256 tokenId) internal virtual {\\n        _safeMint(to, tokenId, \\\"\\\");\\n    }\\n\\n    /**\\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\\n     */\\n    function _safeMint(\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) internal virtual {\\n        _mint(to, tokenId);\\n        require(\\n            _checkOnERC721Received(address(0), to, tokenId, _data),\\n            \\\"ERC721: transfer to non ERC721Receiver implementer\\\"\\n        );\\n    }\\n\\n    /**\\n     * @dev Mints `tokenId` and transfers it to `to`.\\n     *\\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must not exist.\\n     * - `to` cannot be the zero address.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _mint(address to, uint256 tokenId) internal virtual {\\n        require(to != address(0), \\\"ERC721: mint to the zero address\\\");\\n        require(!_exists(tokenId), \\\"ERC721: token already minted\\\");\\n\\n        _beforeTokenTransfer(address(0), to, tokenId);\\n\\n        _balances[to] += 1;\\n        _owners[tokenId] = to;\\n\\n        emit Transfer(address(0), to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Destroys `tokenId`.\\n     * The approval is cleared when the token is burned.\\n     *\\n     * Requirements:\\n     *\\n     * - `tokenId` must exist.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _burn(uint256 tokenId) internal virtual {\\n        address owner = CoreRarityERC721.ownerOf(tokenId);\\n\\n        _beforeTokenTransfer(owner, address(0), tokenId);\\n\\n        // Clear approvals\\n        _approve(address(0), tokenId);\\n\\n        _balances[owner] -= 1;\\n        delete _owners[tokenId];\\n\\n        emit Transfer(owner, address(0), tokenId);\\n    }\\n\\n    /**\\n     * @dev Transfers `tokenId` from `from` to `to`.\\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\\n     *\\n     * Requirements:\\n     *\\n     * - `to` cannot be the zero address.\\n     * - `tokenId` token must be owned by `from`.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function _transfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual {\\n        require(CoreRarityERC721.ownerOf(tokenId) == from, \\\"ERC721: transfer of token that is not own\\\");\\n        require(to != address(0), \\\"ERC721: transfer to the zero address\\\");\\n\\n        _beforeTokenTransfer(from, to, tokenId);\\n\\n        // Clear approvals from the previous owner\\n        _approve(address(0), tokenId);\\n\\n        _balances[from] -= 1;\\n        _balances[to] += 1;\\n        _owners[tokenId] = to;\\n\\n        emit Transfer(from, to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Approve `to` to operate on `tokenId`\\n     *\\n     * Emits a {Approval} event.\\n     */\\n    function _approve(address to, uint256 tokenId) internal virtual {\\n        _tokenApprovals[tokenId] = to;\\n        emit Approval(CoreRarityERC721.ownerOf(tokenId), to, tokenId);\\n    }\\n\\n    /**\\n     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\\n     * The call is not executed if the target address is not a contract.\\n     *\\n     * @param from address representing the previous owner of the given token ID\\n     * @param to target address that will receive the tokens\\n     * @param tokenId uint256 ID of the token to be transferred\\n     * @param _data bytes optional data to send along with the call\\n     * @return bool whether the call correctly returned the expected magic value\\n     */\\n    function _checkOnERC721Received(\\n        address from,\\n        address to,\\n        uint256 tokenId,\\n        bytes memory _data\\n    ) private returns (bool) {\\n        if (_isContract(to)) {\\n            try ICoreRarityERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {\\n                return retval == ICoreRarityERC721Receiver(to).onERC721Received.selector;\\n            } catch (bytes memory reason) {\\n                if (reason.length == 0) {\\n                    revert(\\\"ERC721: transfer to non ERC721Receiver implementer\\\");\\n                } else {\\n                    assembly {\\n                        revert(add(32, reason), mload(reason))\\n                    }\\n                }\\n            }\\n        } else {\\n            return true;\\n        }\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any token transfer. This includes minting\\n     * and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\\n     * transferred to `to`.\\n     * - When `from` is zero, `tokenId` will be minted for `to`.\\n     * - When `to` is zero, ``from``'s `tokenId` will be burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual {}\\n}\\n\\n\\n\\n\\n\\n\\n\\n/**\\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\\n * @dev See https://eips.ethereum.org/EIPS/eip-721\\n */\\ninterface ICoreRarityERC721Enumerable is ICoreRarityERC721 {\\n    /**\\n     * @dev Returns the total amount of tokens stored by the contract.\\n     */\\n    function totalSupply() external view returns (uint256);\\n\\n    /**\\n     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\\n     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\\n     */\\n    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);\\n\\n    /**\\n     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\\n     * Use along with {totalSupply} to enumerate all tokens.\\n     */\\n    function tokenByIndex(uint256 index) external view returns (uint256);\\n}\\n\\n\\n/**\\n * @dev This implements an optional extension of {ERC721} defined in the EIP that adds\\n * enumerability of all the token ids in the contract as well as all token ids owned by each\\n * account.\\n */\\nabstract contract CoreRarityERC721Enumerable is CoreRarityERC721, ICoreRarityERC721Enumerable {\\n    // Mapping from owner to list of owned token IDs\\n    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;\\n\\n    // Mapping from token ID to index of the owner tokens list\\n    mapping(uint256 => uint256) private _ownedTokensIndex;\\n\\n    // Array with all token ids, used for enumeration\\n    uint256[] private _allTokens;\\n\\n    // Mapping from token id to position in the allTokens array\\n    mapping(uint256 => uint256) private _allTokensIndex;\\n\\n    /**\\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\\n     */\\n    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {\\n        require(index < CoreRarityERC721.balanceOf(owner), \\\"ERC721Enumerable: owner index out of bounds\\\");\\n        return _ownedTokens[owner][index];\\n    }\\n\\n    /**\\n     * @dev See {IERC721Enumerable-totalSupply}.\\n     */\\n    function totalSupply() public view virtual override returns (uint256) {\\n        return _allTokens.length;\\n    }\\n\\n    /**\\n     * @dev See {IERC721Enumerable-tokenByIndex}.\\n     */\\n    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {\\n        require(index < CoreRarityERC721Enumerable.totalSupply(), \\\"ERC721Enumerable: global index out of bounds\\\");\\n        return _allTokens[index];\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any token transfer. This includes minting\\n     * and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\\n     * transferred to `to`.\\n     * - When `from` is zero, `tokenId` will be minted for `to`.\\n     * - When `to` is zero, ``from``'s `tokenId` will be burned.\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 tokenId\\n    ) internal virtual override {\\n        super._beforeTokenTransfer(from, to, tokenId);\\n\\n        if (from == address(0)) {\\n            _addTokenToAllTokensEnumeration(tokenId);\\n        } else if (from != to) {\\n            _removeTokenFromOwnerEnumeration(from, tokenId);\\n        }\\n        if (to == address(0)) {\\n            _removeTokenFromAllTokensEnumeration(tokenId);\\n        } else if (to != from) {\\n            _addTokenToOwnerEnumeration(to, tokenId);\\n        }\\n    }\\n\\n    /**\\n     * @dev Private function to add a token to this extension's ownership-tracking data structures.\\n     * @param to address representing the new owner of the given token ID\\n     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address\\n     */\\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\\n        uint256 length = CoreRarityERC721.balanceOf(to);\\n        _ownedTokens[to][length] = tokenId;\\n        _ownedTokensIndex[tokenId] = length;\\n    }\\n\\n    /**\\n     * @dev Private function to add a token to this extension's token tracking data structures.\\n     * @param tokenId uint256 ID of the token to be added to the tokens list\\n     */\\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\\n        _allTokensIndex[tokenId] = _allTokens.length;\\n        _allTokens.push(tokenId);\\n    }\\n\\n    /**\\n     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\\n     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\\n     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).\\n     * This has O(1) time complexity, but alters the order of the _ownedTokens array.\\n     * @param from address representing the previous owner of the given token ID\\n     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\\n     */\\n    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\\n        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\\n        // then delete the last slot (swap and pop).\\n\\n        uint256 lastTokenIndex = CoreRarityERC721.balanceOf(from) - 1;\\n        uint256 tokenIndex = _ownedTokensIndex[tokenId];\\n\\n        // When the token to delete is the last token, the swap operation is unnecessary\\n        if (tokenIndex != lastTokenIndex) {\\n            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\\n\\n            _ownedTokens[from][tokenIndex] = lastTokenId;\\n            // Move the last token to the slot of the to-delete token\\n            _ownedTokensIndex[lastTokenId] = tokenIndex;\\n            // Update the moved token's index\\n        }\\n\\n        // This also deletes the contents at the last position of the array\\n        delete _ownedTokensIndex[tokenId];\\n        delete _ownedTokens[from][lastTokenIndex];\\n    }\\n\\n    /**\\n     * @dev Private function to remove a token from this extension's token tracking data structures.\\n     * This has O(1) time complexity, but alters the order of the _allTokens array.\\n     * @param tokenId uint256 ID of the token to be removed from the tokens list\\n     */\\n    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\\n        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\\n        // then delete the last slot (swap and pop).\\n\\n        uint256 lastTokenIndex = _allTokens.length - 1;\\n        uint256 tokenIndex = _allTokensIndex[tokenId];\\n\\n        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\\n        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\\n        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\\n        uint256 lastTokenId = _allTokens[lastTokenIndex];\\n\\n        _allTokens[tokenIndex] = lastTokenId;\\n        // Move the last token to the slot of the to-delete token\\n        _allTokensIndex[lastTokenId] = tokenIndex;\\n        // Update the moved token's index\\n\\n        // This also deletes the contents at the last position of the array\\n        delete _allTokensIndex[tokenId];\\n        _allTokens.pop();\\n    }\\n}\\n\\ncontract core_rarity is CoreRarityERC721Enumerable {\\n    uint public next_summoner;\\n    uint constant xp_per_day = 250e18;\\n    uint constant DAY = 1 days;\\n\\n    string constant name = \\\"Rarity Manifested\\\";\\n    string constant symbol = \\\"RM\\\";\\n\\n    mapping(uint => uint) public xp;\\n    mapping(uint => uint) public adventurers_log;\\n    mapping(uint => uint) public class;\\n    mapping(uint => uint) public level;\\n\\n    event summoned(address indexed owner, uint class, uint summoner);\\n    event leveled(address indexed owner, uint level, uint summoner);\\n\\n    function adventure(uint _summoner) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        require(block.timestamp > adventurers_log[_summoner]);\\n        adventurers_log[_summoner] = block.timestamp + DAY;\\n        xp[_summoner] += xp_per_day;\\n    }\\n\\n    function spend_xp(uint _summoner, uint _xp) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        xp[_summoner] -= _xp;\\n    }\\n\\n    function level_up(uint _summoner) external {\\n        require(_isApprovedOrOwner(msg.sender, _summoner));\\n        uint _level = level[_summoner];\\n        uint _xp_required = xp_required(_level);\\n        xp[_summoner] -= _xp_required;\\n        level[_summoner] = _level + 1;\\n        emit leveled(msg.sender, level[_summoner], _summoner);\\n    }\\n\\n    function summoner(uint _summoner) external view returns (uint _xp, uint _log, uint _class, uint _level) {\\n        _xp = xp[_summoner];\\n        _log = adventurers_log[_summoner];\\n        _class = class[_summoner];\\n        _level = level[_summoner];\\n    }\\n\\n    function summon(uint _class) external {\\n        require(1 <= _class && _class <= 11);\\n        uint _next_summoner = next_summoner;\\n        class[_next_summoner] = _class;\\n        level[_next_summoner] = 1;\\n        _safeMint(msg.sender, _next_summoner);\\n        emit summoned(msg.sender, _class, _next_summoner);\\n        next_summoner++;\\n    }\\n\\n    function xp_required(uint curent_level) public pure returns (uint xp_to_next_level) {\\n        xp_to_next_level = curent_level * 1000e18;\\n        for (uint i = 1; i < curent_level; i++) {\\n            xp_to_next_level += curent_level * 1000e18;\\n        }\\n    }\\n\\n    function tokenURI(uint256 _summoner) public view returns (string memory) {\\n        string[7] memory parts;\\n        parts[0] = '<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" preserveAspectRatio=\\\"xMinYMin meet\\\" viewBox=\\\"0 0 350 350\\\"><style>.base { fill: white; font-family: serif; font-size: 14px; }</style><rect width=\\\"100%\\\" height=\\\"100%\\\" fill=\\\"black\\\" /><text x=\\\"10\\\" y=\\\"20\\\" class=\\\"base\\\">';\\n\\n        parts[1] = string(abi.encodePacked(\\\"class\\\", \\\" \\\", classes(class[_summoner])));\\n\\n        parts[2] = '</text><text x=\\\"10\\\" y=\\\"40\\\" class=\\\"base\\\">';\\n\\n        parts[3] = string(abi.encodePacked(\\\"level\\\", \\\" \\\", toString(level[_summoner])));\\n\\n        parts[4] = '</text><text x=\\\"10\\\" y=\\\"60\\\" class=\\\"base\\\">';\\n\\n        parts[5] = string(abi.encodePacked(\\\"xp\\\", \\\" \\\", toString(xp[_summoner] / 1e18)));\\n\\n        parts[6] = '</text></svg>';\\n\\n        string memory output = string(abi.encodePacked(parts[0], parts[1], parts[2], parts[3], parts[4], parts[5], parts[6]));\\n\\n        string memory json = LCoreRarityBase64.encode(bytes(string(abi.encodePacked('{\\\"name\\\": \\\"summoner #', toString(_summoner), '\\\", \\\"description\\\": \\\"Rarity is achieved via an active economy, summoners must level, gain feats, learn spells, to be able to craft gear. This allows for market driven rarity while allowing an ever growing economy. Feats, spells, and summoner gear is ommitted as part of further expansions.\\\", \\\"image\\\": \\\"data:image/svg+xml;base64,', LCoreRarityBase64.encode(bytes(output)), '\\\"}'))));\\n        output = string(abi.encodePacked('data:application/json;base64,', json));\\n\\n        return output;\\n    }\\n\\n    function classes(uint id) public pure returns (string memory description) {\\n        if (id == 1) {\\n            return \\\"Barbarian\\\";\\n        } else if (id == 2) {\\n            return \\\"Bard\\\";\\n        } else if (id == 3) {\\n            return \\\"Cleric\\\";\\n        } else if (id == 4) {\\n            return \\\"Druid\\\";\\n        } else if (id == 5) {\\n            return \\\"Fighter\\\";\\n        } else if (id == 6) {\\n            return \\\"Monk\\\";\\n        } else if (id == 7) {\\n            return \\\"Paladin\\\";\\n        } else if (id == 8) {\\n            return \\\"Ranger\\\";\\n        } else if (id == 9) {\\n            return \\\"Rogue\\\";\\n        } else if (id == 10) {\\n            return \\\"Sorcerer\\\";\\n        } else if (id == 11) {\\n            return \\\"Wizard\\\";\\n        }\\n    }\\n\\n    function toString(uint256 value) internal pure returns (string memory) {\\n        // Inspired by OraclizeAPI's implementation - MIT license\\n        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\\n\\n        if (value == 0) {\\n            return \\\"0\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 digits;\\n        while (temp != 0) {\\n            digits++;\\n            temp /= 10;\\n        }\\n        bytes memory buffer = new bytes(digits);\\n        while (value != 0) {\\n            digits -= 1;\\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\\n            value /= 10;\\n        }\\n        return string(buffer);\\n    }\\n}\\n\\n/// [MIT License]\\n/// @title Base64\\n/// @notice Provides a function for encoding some bytes in base64\\n/// @author Brecht Devos <brecht@loopring.org>\\nlibrary LCoreRarityBase64 {\\n    bytes internal constant TABLE = \\\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\\\";\\n\\n    /// @notice Encodes some bytes to the base64 representation\\n    function encode(bytes memory data) internal pure returns (string memory) {\\n        uint256 len = data.length;\\n        if (len == 0) return \\\"\\\";\\n\\n        // multiply by 4/3 rounded up\\n        uint256 encodedLen = 4 * ((len + 2) / 3);\\n\\n        // Add some extra buffer at the end\\n        bytes memory result = new bytes(encodedLen + 32);\\n\\n        bytes memory table = TABLE;\\n\\n        assembly {\\n            let tablePtr := add(table, 1)\\n            let resultPtr := add(result, 32)\\n\\n            for {\\n                let i := 0\\n            } lt(i, len) {\\n\\n            } {\\n                i := add(i, 3)\\n                let input := and(mload(add(data, i)), 0xffffff)\\n\\n                let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))\\n                out := shl(8, out)\\n                out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))\\n                out := shl(224, out)\\n\\n                mstore(resultPtr, out)\\n\\n                resultPtr := add(resultPtr, 4)\\n            }\\n\\n            switch mod(len, 3)\\n            case 1 {\\n                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))\\n            }\\n            case 2 {\\n                mstore(sub(resultPtr, 1), shl(248, 0x3d))\\n            }\\n\\n            mstore(result, encodedLen)\\n        }\\n\\n        return string(result);\\n    }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":true,\"runs\":200},\"evmVersion\":\"london\",\"libraries\":{}}}",
  "codeformat": "solidity-standard-json-input",
  "contractname": "/contracts/core/rarity.sol:core_rarity",
  "compilerversion": "v0.8.11+commit.d7f03943",
  "constructorArguements": ""
}
Checking status of verification request 6y4qps2xisgtp78bnv3xti6thsapxxujb1brj5mdid42bxaxqf
Fail - Unable to verify
Failed to verify 1 contract(s): core_rarity

[0xZXDX]

The default Migrations contract also fails.

$ npx truffle run verify Migrations --network ftmtestnet --debug
DEBUG logging is turned ON
Running truffle-plugin-verify v0.5.21
Retrieving network's chain ID
Verifying Migrations
Reading artifact file atxx/WorkSpaces/rarity/build/contracts/Migrations.json
Retrieving constructor parameters from https://api-testnet.ftmscan.com/api?apiKey=xxx&module=account&action=txlist&address=0x21BBb6AF1f908895183d12Bd4b27c45A35807cC7&page=1&sort=asc&offset=1
Constructor parameters retrieved: 0x
Sending verify request with POST arguments:
{
  "apikey": "xxx",
  "module": "contract",
  "action": "verifysourcecode",
  "contractaddress": "0x21BBb6AF1f908895183d12Bd4b27c45A35807cC7",
  "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/contracts/Migrations.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\npragma solidity >=0.4.22 <0.9.0;\\n\\ncontract Migrations {\\n    address public owner = msg.sender;\\n    uint public last_completed_migration;\\n\\n    modifier restricted() {\\n        require(\\n            msg.sender == owner,\\n            \\\"This function is restricted to the contract's owner\\\"\\n        );\\n        _;\\n    }\\n\\n    function setCompleted(uint completed) public restricted {\\n        last_completed_migration = completed;\\n    }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":true,\"runs\":200},\"evmVersion\":\"london\",\"libraries\":{}}}",
  "codeformat": "solidity-standard-json-input",
  "contractname": "/contracts/Migrations.sol:Migrations",
  "compilerversion": "v0.8.11+commit.d7f03943",
  "constructorArguements": ""
}
Checking status of verification request sryssnsbyxhdzlxmipvgtiareqe4hlhdqrvumjznryypvwdi4e
Fail - Unable to verify
Failed to verify 1 contract(s): Migrations

[rkalis]

Thanks for the bug report. If the default "Migrations" contract fails verification as well then I think the issue is probably related to FtmScan. Does it work when you try to deploy to a different networ (e.g. an ETH testnet like Rinkeby/Goerli)?

@Enigmatic331 are/were there any known issues with FtmScan's verification?

[0xZXDX]

hello when i switch to ropsten network it works fine.

$ npx truffle migrate --network ftmtestnet

Compiling your contracts...
===========================
> Compiling ./contracts/Migrations.sol

> Artifacts written to /Users/xx/WorkSpaces/rarity/contract/build/contracts
> Compiled successfully using:
   - solc: 0.8.7+commit.e28d00a7.Emscripten.clang

Starting migrations...
======================
> Network name:    'ftmtestnet'
> Network id:      4002
> Block gas limit: xx (0xffffffffffff)

1_initial_migration.js
======================

   Deploying 'Migrations'
   ----------------------
   > transaction hash:    xxxxx
   > Blocks: 0            Seconds: 0
   > contract address:    xxxxx
   > block number:        xx
   > block timestamp:     xx
   > account:             xxxxx
   > balance:             37.5138442981072
   > gas used:            xx (0x26d7e)
   > gas price:           202.5 gwei
   > value sent:          0 ETH
   > total cost:          0.032218155 ETH

   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:         0.032218155 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.032218155 ETH

$ npx truffle run verify Migrations --network ftmtestnet
Verifying Migrations
Fail - Unable to verify
Failed to verify 1 contract(s): Migrations

$ npx truffle migrate --network ropsten

Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.

WARNING: Ganache forking only supports EIP-1193-compliant providers. Legacy support for send is currently enabled, but will be removed in a future version _without_ a breaking change. To remove this warning, switch to an EIP-1193 provider. This error is probably caused by an old version of Web3's HttpProvider (or ganache < v7)

eth_getBlockByNumber

Migrations dry-run (simulation)
===============================
> Network name:    'ropsten-fork'
> Network id:      3
> Block gas limit: 8000000 (0x7a1200)

1_initial_migration.js
======================
eth_accounts
net_version
eth_getBlockByNumber
eth_getBlockByNumber
net_version
eth_getBlockByNumber
eth_estimateGas

   Deploying 'Migrations'
   ----------------------
net_version
eth_blockNumber
eth_getBlockByNumber
eth_estimateGas
eth_getBlockByNumber
eth_gasPrice
eth_sendTransaction

  Transaction: xxx
  Contract created: xxx
  Gas usage: 155222
  Block number: 12017906
  Block time: Sat Feb 26 2022 13:19:39 GMT+0800 (中国标准时间)

eth_getTransactionReceipt
eth_subscribe
eth_getCode
eth_getTransactionByHash
eth_getBlockByNumber
eth_getBalance
   > block number:        xxx
   > block timestamp:     xxx
   > account:             xxx
   > balance:             5.993216930815807638
   > gas used:            155222 (0x25e56)
   > gas price:           2.500000008 gwei
   > value sent:          0 ETH
   > total cost:          0.000388055001241776 ETH

eth_getBlockByNumber
eth_getBlockByNumber
eth_estimateGas
eth_getBlockByNumber
eth_gasPrice
eth_sendTransaction

  Transaction: xxx
  Gas usage: 45690
  Block number: xxx
  Block time: Sat Feb 26 2022 13:19:39 GMT+0800 (中国标准时间)

eth_getTransactionReceipt
eth_getBlockByNumber
eth_getBlockByNumber
eth_getBlockByNumber
eth_subscribe
   -------------------------------------
   > Total cost:     0.000388055001241776 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.000388055001241776 ETH

Starting migrations...
======================
> Network name:    'ropsten'
> Network id:      3
> Block gas limit: 8000000 (0x7a1200)

1_initial_migration.js
======================

   Deploying 'Migrations'
   ----------------------
   > transaction hash:    xxx
   > Blocks: 0            Seconds: 12
   > contract address:    xxx
   > block number:        xx
   > block timestamp:     xx
   > account:             xxx
   > balance:             5.993216930815652416
   > gas used:            155222 (0x25e56)
   > gas price:           2.500000009 gwei
   > value sent:          0 ETH
   > total cost:          0.000388055001396998 ETH

   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:     0.000388055001396998 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.000388055001396998 ETH

$ npx truffle run verify Migrations --network ropsten
Verifying Migrations
Pass - Verified: https://ropsten.etherscan.io/address/xxx#code
Successfully verified 1 contract(s).

[rkalis]

Does this issue still persist on FtmScan?

[ChristianVermeulen]

I'm actually having the same issue on polygon mumbai.

🤘  truffle run --config=truffle-config.polygon.js verify Aida --network=matic --debug
DEBUG logging is turned ON
Running truffle-plugin-verify v0.5.25
Retrieving network's network ID & chain ID
Verifying Aida
Reading artifact file at /Users/seer/Development/Aida/build/polygon-contracts/Aida.json
Retrieving constructor parameters from https://api-testnet.polygonscan.com/api?apiKey=xxx&module=account&action=txlist&address=0x4ece0883273d6e71ed70F772A67B99417Db14c71&page=1&sort=asc&offset=1
Constructor parameters retrieved: 0x
Sending verify request with POST arguments:
{
  "apikey": "xxx",
  "module": "contract",
  "action": "verifysourcecode",
  "contractaddress": "0x4ece0883273d6e71ed70F772A67B99417Db14c71",
  "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/contracts/polygon/Aida.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\npragma solidity ^0.8.4;\\n\\nimport \\\"@openzeppelin/contracts/token/ERC20/ERC20.sol\\\";\\nimport \\\"@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol\\\";\\nimport \\\"@openzeppelin/contracts/access/AccessControl.sol\\\";\\nimport \\\"@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol\\\";\\n\\n/// @custom:security-contact hello@aident.app\\ncontract Aida is ERC20, ERC20Snapshot, AccessControl, ERC20Permit {\\n    bytes32 public constant SNAPSHOT_ROLE = keccak256(\\\"SNAPSHOT_ROLE\\\");\\n    bytes32 public constant MINTER_ROLE = keccak256(\\\"MINTER_ROLE\\\");\\n    bytes32 public constant BURNER_ROLE = keccak256(\\\"BURNER_ROLE\\\");\\n\\n    constructor() ERC20(\\\"Aida\\\", \\\"AIDA\\\") ERC20Permit(\\\"Aida\\\") {\\n        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);\\n        _grantRole(SNAPSHOT_ROLE, msg.sender);\\n        _grantRole(MINTER_ROLE, msg.sender);\\n        _grantRole(BURNER_ROLE, msg.sender);\\n        _mint(msg.sender, 50000 * 10 ** decimals());\\n    }\\n\\n    function addAdmin(address newAdmin) public onlyRole(DEFAULT_ADMIN_ROLE) {\\n        _grantRole(DEFAULT_ADMIN_ROLE, newAdmin);\\n    }\\n\\n    function removeAdmin(address oldAdmin) public onlyRole(DEFAULT_ADMIN_ROLE) {\\n        _revokeRole(DEFAULT_ADMIN_ROLE, oldAdmin);\\n    }\\n\\n    function snapshot() public onlyRole(SNAPSHOT_ROLE) {\\n        _snapshot();\\n    }\\n\\n    function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {\\n        _mint(to, amount);\\n    }\\n\\n    function burn(uint256 amount) public onlyRole(BURNER_ROLE) {\\n        _burn(msg.sender, amount);\\n    }\\n\\n    // The following functions are overrides required by Solidity.\\n    function _beforeTokenTransfer(address from, address to, uint256 amount)\\n    internal\\n    override(ERC20, ERC20Snapshot)\\n    {\\n        super._beforeTokenTransfer(from, to, amount);\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/math/Math.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Standard math utilities missing in the Solidity language.\\n */\\nlibrary Math {\\n    /**\\n     * @dev Returns the largest of two numbers.\\n     */\\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\\n        return a >= b ? a : b;\\n    }\\n\\n    /**\\n     * @dev Returns the smallest of two numbers.\\n     */\\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\\n        return a < b ? a : b;\\n    }\\n\\n    /**\\n     * @dev Returns the average of two numbers. The result is rounded towards\\n     * zero.\\n     */\\n    function average(uint256 a, uint256 b) internal pure returns (uint256) {\\n        // (a + b) / 2 can overflow.\\n        return (a & b) + (a ^ b) / 2;\\n    }\\n\\n    /**\\n     * @dev Returns the ceiling of the division of two numbers.\\n     *\\n     * This differs from standard division with `/` in that it rounds up instead\\n     * of rounding down.\\n     */\\n    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\\n        // (a + b - 1) / b can overflow on addition, so we distribute.\\n        return a / b + (a % b == 0 ? 0 : 1);\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/introspection/IERC165.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Interface of the ERC165 standard, as defined in the\\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\\n *\\n * Implementers can declare support of contract interfaces, which can then be\\n * queried by others ({ERC165Checker}).\\n *\\n * For an implementation, see {ERC165}.\\n */\\ninterface IERC165 {\\n    /**\\n     * @dev Returns true if this contract implements the interface defined by\\n     * `interfaceId`. See the corresponding\\n     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\\n     * to learn more about how these ids are created.\\n     *\\n     * This function call must use less than 30 000 gas.\\n     */\\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\\n}\\n\"},\"@openzeppelin/contracts/utils/introspection/ERC165.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./IERC165.sol\\\";\\n\\n/**\\n * @dev Implementation of the {IERC165} interface.\\n *\\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\\n * for the additional interface id that will be supported. For example:\\n *\\n * ```solidity\\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\\n *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\\n * }\\n * ```\\n *\\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\\n */\\nabstract contract ERC165 is IERC165 {\\n    /**\\n     * @dev See {IERC165-supportsInterface}.\\n     */\\n    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\\n        return interfaceId == type(IERC165).interfaceId;\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./ECDSA.sol\\\";\\n\\n/**\\n * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.\\n *\\n * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,\\n * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding\\n * they need in their contracts using a combination of `abi.encode` and `keccak256`.\\n *\\n * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding\\n * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA\\n * ({_hashTypedDataV4}).\\n *\\n * The implementation of the domain separator was designed to be as efficient as possible while still properly updating\\n * the chain id to protect against replay attacks on an eventual fork of the chain.\\n *\\n * NOTE: This contract implements the version of the encoding known as \\\"v4\\\", as implemented by the JSON RPC method\\n * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].\\n *\\n * _Available since v3.4._\\n */\\nabstract contract EIP712 {\\n    /* solhint-disable var-name-mixedcase */\\n    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to\\n    // invalidate the cached domain separator if the chain id changes.\\n    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;\\n    uint256 private immutable _CACHED_CHAIN_ID;\\n    address private immutable _CACHED_THIS;\\n\\n    bytes32 private immutable _HASHED_NAME;\\n    bytes32 private immutable _HASHED_VERSION;\\n    bytes32 private immutable _TYPE_HASH;\\n\\n    /* solhint-enable var-name-mixedcase */\\n\\n    /**\\n     * @dev Initializes the domain separator and parameter caches.\\n     *\\n     * The meaning of `name` and `version` is specified in\\n     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:\\n     *\\n     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.\\n     * - `version`: the current major version of the signing domain.\\n     *\\n     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart\\n     * contract upgrade].\\n     */\\n    constructor(string memory name, string memory version) {\\n        bytes32 hashedName = keccak256(bytes(name));\\n        bytes32 hashedVersion = keccak256(bytes(version));\\n        bytes32 typeHash = keccak256(\\n            \\\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\\\"\\n        );\\n        _HASHED_NAME = hashedName;\\n        _HASHED_VERSION = hashedVersion;\\n        _CACHED_CHAIN_ID = block.chainid;\\n        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);\\n        _CACHED_THIS = address(this);\\n        _TYPE_HASH = typeHash;\\n    }\\n\\n    /**\\n     * @dev Returns the domain separator for the current chain.\\n     */\\n    function _domainSeparatorV4() internal view returns (bytes32) {\\n        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {\\n            return _CACHED_DOMAIN_SEPARATOR;\\n        } else {\\n            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);\\n        }\\n    }\\n\\n    function _buildDomainSeparator(\\n        bytes32 typeHash,\\n        bytes32 nameHash,\\n        bytes32 versionHash\\n    ) private view returns (bytes32) {\\n        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));\\n    }\\n\\n    /**\\n     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this\\n     * function returns the hash of the fully encoded EIP712 message for this domain.\\n     *\\n     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:\\n     *\\n     * ```solidity\\n     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(\\n     *     keccak256(\\\"Mail(address to,string contents)\\\"),\\n     *     mailTo,\\n     *     keccak256(bytes(mailContents))\\n     * )));\\n     * address signer = ECDSA.recover(digest, signature);\\n     * ```\\n     */\\n    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {\\n        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/cryptography/ECDSA.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/ECDSA.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../Strings.sol\\\";\\n\\n/**\\n * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.\\n *\\n * These functions can be used to verify that a message was signed by the holder\\n * of the private keys of a given address.\\n */\\nlibrary ECDSA {\\n    enum RecoverError {\\n        NoError,\\n        InvalidSignature,\\n        InvalidSignatureLength,\\n        InvalidSignatureS,\\n        InvalidSignatureV\\n    }\\n\\n    function _throwError(RecoverError error) private pure {\\n        if (error == RecoverError.NoError) {\\n            return; // no error: do nothing\\n        } else if (error == RecoverError.InvalidSignature) {\\n            revert(\\\"ECDSA: invalid signature\\\");\\n        } else if (error == RecoverError.InvalidSignatureLength) {\\n            revert(\\\"ECDSA: invalid signature length\\\");\\n        } else if (error == RecoverError.InvalidSignatureS) {\\n            revert(\\\"ECDSA: invalid signature 's' value\\\");\\n        } else if (error == RecoverError.InvalidSignatureV) {\\n            revert(\\\"ECDSA: invalid signature 'v' value\\\");\\n        }\\n    }\\n\\n    /**\\n     * @dev Returns the address that signed a hashed message (`hash`) with\\n     * `signature` or error string. This address can then be used for verification purposes.\\n     *\\n     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\\n     * this function rejects them by requiring the `s` value to be in the lower\\n     * half order, and the `v` value to be either 27 or 28.\\n     *\\n     * IMPORTANT: `hash` _must_ be the result of a hash operation for the\\n     * verification to be secure: it is possible to craft signatures that\\n     * recover to arbitrary addresses for non-hashed data. A safe way to ensure\\n     * this is by receiving a hash of the original message (which may otherwise\\n     * be too long), and then calling {toEthSignedMessageHash} on it.\\n     *\\n     * Documentation for signature generation:\\n     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]\\n     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]\\n     *\\n     * _Available since v4.3._\\n     */\\n    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {\\n        // Check the signature length\\n        // - case 65: r,s,v signature (standard)\\n        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._\\n        if (signature.length == 65) {\\n            bytes32 r;\\n            bytes32 s;\\n            uint8 v;\\n            // ecrecover takes the signature parameters, and the only way to get them\\n            // currently is to use assembly.\\n            assembly {\\n                r := mload(add(signature, 0x20))\\n                s := mload(add(signature, 0x40))\\n                v := byte(0, mload(add(signature, 0x60)))\\n            }\\n            return tryRecover(hash, v, r, s);\\n        } else if (signature.length == 64) {\\n            bytes32 r;\\n            bytes32 vs;\\n            // ecrecover takes the signature parameters, and the only way to get them\\n            // currently is to use assembly.\\n            assembly {\\n                r := mload(add(signature, 0x20))\\n                vs := mload(add(signature, 0x40))\\n            }\\n            return tryRecover(hash, r, vs);\\n        } else {\\n            return (address(0), RecoverError.InvalidSignatureLength);\\n        }\\n    }\\n\\n    /**\\n     * @dev Returns the address that signed a hashed message (`hash`) with\\n     * `signature`. This address can then be used for verification purposes.\\n     *\\n     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\\n     * this function rejects them by requiring the `s` value to be in the lower\\n     * half order, and the `v` value to be either 27 or 28.\\n     *\\n     * IMPORTANT: `hash` _must_ be the result of a hash operation for the\\n     * verification to be secure: it is possible to craft signatures that\\n     * recover to arbitrary addresses for non-hashed data. A safe way to ensure\\n     * this is by receiving a hash of the original message (which may otherwise\\n     * be too long), and then calling {toEthSignedMessageHash} on it.\\n     */\\n    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {\\n        (address recovered, RecoverError error) = tryRecover(hash, signature);\\n        _throwError(error);\\n        return recovered;\\n    }\\n\\n    /**\\n     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.\\n     *\\n     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]\\n     *\\n     * _Available since v4.3._\\n     */\\n    function tryRecover(\\n        bytes32 hash,\\n        bytes32 r,\\n        bytes32 vs\\n    ) internal pure returns (address, RecoverError) {\\n        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);\\n        uint8 v = uint8((uint256(vs) >> 255) + 27);\\n        return tryRecover(hash, v, r, s);\\n    }\\n\\n    /**\\n     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.\\n     *\\n     * _Available since v4.2._\\n     */\\n    function recover(\\n        bytes32 hash,\\n        bytes32 r,\\n        bytes32 vs\\n    ) internal pure returns (address) {\\n        (address recovered, RecoverError error) = tryRecover(hash, r, vs);\\n        _throwError(error);\\n        return recovered;\\n    }\\n\\n    /**\\n     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,\\n     * `r` and `s` signature fields separately.\\n     *\\n     * _Available since v4.3._\\n     */\\n    function tryRecover(\\n        bytes32 hash,\\n        uint8 v,\\n        bytes32 r,\\n        bytes32 s\\n    ) internal pure returns (address, RecoverError) {\\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\\n        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most\\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\\n        //\\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\\n        // these malleable signatures as well.\\n        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {\\n            return (address(0), RecoverError.InvalidSignatureS);\\n        }\\n        if (v != 27 && v != 28) {\\n            return (address(0), RecoverError.InvalidSignatureV);\\n        }\\n\\n        // If the signature is valid (and not malleable), return the signer address\\n        address signer = ecrecover(hash, v, r, s);\\n        if (signer == address(0)) {\\n            return (address(0), RecoverError.InvalidSignature);\\n        }\\n\\n        return (signer, RecoverError.NoError);\\n    }\\n\\n    /**\\n     * @dev Overload of {ECDSA-recover} that receives the `v`,\\n     * `r` and `s` signature fields separately.\\n     */\\n    function recover(\\n        bytes32 hash,\\n        uint8 v,\\n        bytes32 r,\\n        bytes32 s\\n    ) internal pure returns (address) {\\n        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);\\n        _throwError(error);\\n        return recovered;\\n    }\\n\\n    /**\\n     * @dev Returns an Ethereum Signed Message, created from a `hash`. This\\n     * produces hash corresponding to the one signed with the\\n     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\\n     * JSON-RPC method as part of EIP-191.\\n     *\\n     * See {recover}.\\n     */\\n    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {\\n        // 32 is the length in bytes of hash,\\n        // enforced by the type signature above\\n        return keccak256(abi.encodePacked(\\\"\\\\x19Ethereum Signed Message:\\\\n32\\\", hash));\\n    }\\n\\n    /**\\n     * @dev Returns an Ethereum Signed Message, created from `s`. This\\n     * produces hash corresponding to the one signed with the\\n     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\\n     * JSON-RPC method as part of EIP-191.\\n     *\\n     * See {recover}.\\n     */\\n    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {\\n        return keccak256(abi.encodePacked(\\\"\\\\x19Ethereum Signed Message:\\\\n\\\", Strings.toString(s.length), s));\\n    }\\n\\n    /**\\n     * @dev Returns an Ethereum Signed Typed Data, created from a\\n     * `domainSeparator` and a `structHash`. This produces hash corresponding\\n     * to the one signed with the\\n     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]\\n     * JSON-RPC method as part of EIP-712.\\n     *\\n     * See {recover}.\\n     */\\n    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {\\n        return keccak256(abi.encodePacked(\\\"\\\\x19\\\\x01\\\", domainSeparator, structHash));\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/Strings.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev String operations.\\n */\\nlibrary Strings {\\n    bytes16 private constant _HEX_SYMBOLS = \\\"0123456789abcdef\\\";\\n\\n    /**\\n     * @dev Converts a `uint256` to its ASCII `string` decimal representation.\\n     */\\n    function toString(uint256 value) internal pure returns (string memory) {\\n        // Inspired by OraclizeAPI's implementation - MIT licence\\n        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\\n\\n        if (value == 0) {\\n            return \\\"0\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 digits;\\n        while (temp != 0) {\\n            digits++;\\n            temp /= 10;\\n        }\\n        bytes memory buffer = new bytes(digits);\\n        while (value != 0) {\\n            digits -= 1;\\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\\n            value /= 10;\\n        }\\n        return string(buffer);\\n    }\\n\\n    /**\\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\\n     */\\n    function toHexString(uint256 value) internal pure returns (string memory) {\\n        if (value == 0) {\\n            return \\\"0x00\\\";\\n        }\\n        uint256 temp = value;\\n        uint256 length = 0;\\n        while (temp != 0) {\\n            length++;\\n            temp >>= 8;\\n        }\\n        return toHexString(value, length);\\n    }\\n\\n    /**\\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\\n     */\\n    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\\n        bytes memory buffer = new bytes(2 * length + 2);\\n        buffer[0] = \\\"0\\\";\\n        buffer[1] = \\\"x\\\";\\n        for (uint256 i = 2 * length + 1; i > 1; --i) {\\n            buffer[i] = _HEX_SYMBOLS[value & 0xf];\\n            value >>= 4;\\n        }\\n        require(value == 0, \\\"Strings: hex length insufficient\\\");\\n        return string(buffer);\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/Counters.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @title Counters\\n * @author Matt Condon (@shrugs)\\n * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number\\n * of elements in a mapping, issuing ERC721 ids, or counting request ids.\\n *\\n * Include with `using Counters for Counters.Counter;`\\n */\\nlibrary Counters {\\n    struct Counter {\\n        // This variable should never be directly accessed by users of the library: interactions must be restricted to\\n        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add\\n        // this feature: see https://github.com/ethereum/solidity/issues/4637\\n        uint256 _value; // default: 0\\n    }\\n\\n    function current(Counter storage counter) internal view returns (uint256) {\\n        return counter._value;\\n    }\\n\\n    function increment(Counter storage counter) internal {\\n        unchecked {\\n            counter._value += 1;\\n        }\\n    }\\n\\n    function decrement(Counter storage counter) internal {\\n        uint256 value = counter._value;\\n        require(value > 0, \\\"Counter: decrement overflow\\\");\\n        unchecked {\\n            counter._value = value - 1;\\n        }\\n    }\\n\\n    function reset(Counter storage counter) internal {\\n        counter._value = 0;\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/Context.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Provides information about the current execution context, including the\\n * sender of the transaction and its data. While these are generally available\\n * via msg.sender and msg.data, they should not be accessed in such a direct\\n * manner, since when dealing with meta-transactions the account sending and\\n * paying for execution may not be the actual sender (as far as an application\\n * is concerned).\\n *\\n * This contract is only required for intermediate, library-like contracts.\\n */\\nabstract contract Context {\\n    function _msgSender() internal view virtual returns (address) {\\n        return msg.sender;\\n    }\\n\\n    function _msgData() internal view virtual returns (bytes calldata) {\\n        return msg.data;\\n    }\\n}\\n\"},\"@openzeppelin/contracts/utils/Arrays.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/Arrays.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./math/Math.sol\\\";\\n\\n/**\\n * @dev Collection of functions related to array types.\\n */\\nlibrary Arrays {\\n    /**\\n     * @dev Searches a sorted `array` and returns the first index that contains\\n     * a value greater or equal to `element`. If no such index exists (i.e. all\\n     * values in the array are strictly less than `element`), the array length is\\n     * returned. Time complexity O(log n).\\n     *\\n     * `array` is expected to be sorted in ascending order, and to contain no\\n     * repeated elements.\\n     */\\n    function findUpperBound(uint256[] storage array, uint256 element) internal view returns (uint256) {\\n        if (array.length == 0) {\\n            return 0;\\n        }\\n\\n        uint256 low = 0;\\n        uint256 high = array.length;\\n\\n        while (low < high) {\\n            uint256 mid = Math.average(low, high);\\n\\n            // Note that mid will always be strictly less than high (i.e. it will be a valid array index)\\n            // because Math.average rounds down (it does integer division with truncation).\\n            if (array[mid] > element) {\\n                high = mid;\\n            } else {\\n                low = mid + 1;\\n            }\\n        }\\n\\n        // At this point `low` is the exclusive upper bound. We will return the inclusive upper bound.\\n        if (low > 0 && array[low - 1] == element) {\\n            return low - 1;\\n        } else {\\n            return low;\\n        }\\n    }\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in\\n * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].\\n *\\n * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by\\n * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't\\n * need to send a transaction, and thus is not required to hold Ether at all.\\n */\\ninterface IERC20Permit {\\n    /**\\n     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,\\n     * given ``owner``'s signed approval.\\n     *\\n     * IMPORTANT: The same issues {IERC20-approve} has related to transaction\\n     * ordering also apply here.\\n     *\\n     * Emits an {Approval} event.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     * - `deadline` must be a timestamp in the future.\\n     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`\\n     * over the EIP712-formatted function arguments.\\n     * - the signature must use ``owner``'s current nonce (see {nonces}).\\n     *\\n     * For more information on the signature format, see the\\n     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP\\n     * section].\\n     */\\n    function permit(\\n        address owner,\\n        address spender,\\n        uint256 value,\\n        uint256 deadline,\\n        uint8 v,\\n        bytes32 r,\\n        bytes32 s\\n    ) external;\\n\\n    /**\\n     * @dev Returns the current nonce for `owner`. This value must be\\n     * included whenever a signature is generated for {permit}.\\n     *\\n     * Every successful call to {permit} increases ``owner``'s nonce by one. This\\n     * prevents a signature from being used multiple times.\\n     */\\n    function nonces(address owner) external view returns (uint256);\\n\\n    /**\\n     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.\\n     */\\n    // solhint-disable-next-line func-name-mixedcase\\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./draft-IERC20Permit.sol\\\";\\nimport \\\"../ERC20.sol\\\";\\nimport \\\"../../../utils/cryptography/draft-EIP712.sol\\\";\\nimport \\\"../../../utils/cryptography/ECDSA.sol\\\";\\nimport \\\"../../../utils/Counters.sol\\\";\\n\\n/**\\n * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in\\n * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].\\n *\\n * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by\\n * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't\\n * need to send a transaction, and thus is not required to hold Ether at all.\\n *\\n * _Available since v3.4._\\n */\\nabstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {\\n    using Counters for Counters.Counter;\\n\\n    mapping(address => Counters.Counter) private _nonces;\\n\\n    // solhint-disable-next-line var-name-mixedcase\\n    bytes32 private immutable _PERMIT_TYPEHASH =\\n        keccak256(\\\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\\\");\\n\\n    /**\\n     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `\\\"1\\\"`.\\n     *\\n     * It's a good idea to use the same `name` that is defined as the ERC20 token name.\\n     */\\n    constructor(string memory name) EIP712(name, \\\"1\\\") {}\\n\\n    /**\\n     * @dev See {IERC20Permit-permit}.\\n     */\\n    function permit(\\n        address owner,\\n        address spender,\\n        uint256 value,\\n        uint256 deadline,\\n        uint8 v,\\n        bytes32 r,\\n        bytes32 s\\n    ) public virtual override {\\n        require(block.timestamp <= deadline, \\\"ERC20Permit: expired deadline\\\");\\n\\n        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));\\n\\n        bytes32 hash = _hashTypedDataV4(structHash);\\n\\n        address signer = ECDSA.recover(hash, v, r, s);\\n        require(signer == owner, \\\"ERC20Permit: invalid signature\\\");\\n\\n        _approve(owner, spender, value);\\n    }\\n\\n    /**\\n     * @dev See {IERC20Permit-nonces}.\\n     */\\n    function nonces(address owner) public view virtual override returns (uint256) {\\n        return _nonces[owner].current();\\n    }\\n\\n    /**\\n     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.\\n     */\\n    // solhint-disable-next-line func-name-mixedcase\\n    function DOMAIN_SEPARATOR() external view override returns (bytes32) {\\n        return _domainSeparatorV4();\\n    }\\n\\n    /**\\n     * @dev \\\"Consume a nonce\\\": return the current value and increment.\\n     *\\n     * _Available since v4.1._\\n     */\\n    function _useNonce(address owner) internal virtual returns (uint256 current) {\\n        Counters.Counter storage nonce = _nonces[owner];\\n        current = nonce.current();\\n        nonce.increment();\\n    }\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../IERC20.sol\\\";\\n\\n/**\\n * @dev Interface for the optional metadata functions from the ERC20 standard.\\n *\\n * _Available since v4.1._\\n */\\ninterface IERC20Metadata is IERC20 {\\n    /**\\n     * @dev Returns the name of the token.\\n     */\\n    function name() external view returns (string memory);\\n\\n    /**\\n     * @dev Returns the symbol of the token.\\n     */\\n    function symbol() external view returns (string memory);\\n\\n    /**\\n     * @dev Returns the decimals places of the token.\\n     */\\n    function decimals() external view returns (uint8);\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Snapshot.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../ERC20.sol\\\";\\nimport \\\"../../../utils/Arrays.sol\\\";\\nimport \\\"../../../utils/Counters.sol\\\";\\n\\n/**\\n * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and\\n * total supply at the time are recorded for later access.\\n *\\n * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.\\n * In naive implementations it's possible to perform a \\\"double spend\\\" attack by reusing the same balance from different\\n * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be\\n * used to create an efficient ERC20 forking mechanism.\\n *\\n * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a\\n * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot\\n * id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id\\n * and the account address.\\n *\\n * NOTE: Snapshot policy can be customized by overriding the {_getCurrentSnapshotId} method. For example, having it\\n * return `block.number` will trigger the creation of snapshot at the begining of each new block. When overridding this\\n * function, be careful about the monotonicity of its result. Non-monotonic snapshot ids will break the contract.\\n *\\n * Implementing snapshots for every block using this method will incur significant gas costs. For a gas-efficient\\n * alternative consider {ERC20Votes}.\\n *\\n * ==== Gas Costs\\n *\\n * Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log\\n * n)_ in the number of snapshots that have been created, although _n_ for a specific account will generally be much\\n * smaller since identical balances in subsequent snapshots are stored as a single entry.\\n *\\n * There is a constant overhead for normal ERC20 transfers due to the additional snapshot bookkeeping. This overhead is\\n * only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent\\n * transfers will have normal cost until the next snapshot, and so on.\\n */\\n\\nabstract contract ERC20Snapshot is ERC20 {\\n    // Inspired by Jordi Baylina's MiniMeToken to record historical balances:\\n    // https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol\\n\\n    using Arrays for uint256[];\\n    using Counters for Counters.Counter;\\n\\n    // Snapshotted values have arrays of ids and the value corresponding to that id. These could be an array of a\\n    // Snapshot struct, but that would impede usage of functions that work on an array.\\n    struct Snapshots {\\n        uint256[] ids;\\n        uint256[] values;\\n    }\\n\\n    mapping(address => Snapshots) private _accountBalanceSnapshots;\\n    Snapshots private _totalSupplySnapshots;\\n\\n    // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid.\\n    Counters.Counter private _currentSnapshotId;\\n\\n    /**\\n     * @dev Emitted by {_snapshot} when a snapshot identified by `id` is created.\\n     */\\n    event Snapshot(uint256 id);\\n\\n    /**\\n     * @dev Creates a new snapshot and returns its snapshot id.\\n     *\\n     * Emits a {Snapshot} event that contains the same id.\\n     *\\n     * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a\\n     * set of accounts, for example using {AccessControl}, or it may be open to the public.\\n     *\\n     * [WARNING]\\n     * ====\\n     * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,\\n     * you must consider that it can potentially be used by attackers in two ways.\\n     *\\n     * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow\\n     * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target\\n     * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs\\n     * section above.\\n     *\\n     * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.\\n     * ====\\n     */\\n    function _snapshot() internal virtual returns (uint256) {\\n        _currentSnapshotId.increment();\\n\\n        uint256 currentId = _getCurrentSnapshotId();\\n        emit Snapshot(currentId);\\n        return currentId;\\n    }\\n\\n    /**\\n     * @dev Get the current snapshotId\\n     */\\n    function _getCurrentSnapshotId() internal view virtual returns (uint256) {\\n        return _currentSnapshotId.current();\\n    }\\n\\n    /**\\n     * @dev Retrieves the balance of `account` at the time `snapshotId` was created.\\n     */\\n    function balanceOfAt(address account, uint256 snapshotId) public view virtual returns (uint256) {\\n        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _accountBalanceSnapshots[account]);\\n\\n        return snapshotted ? value : balanceOf(account);\\n    }\\n\\n    /**\\n     * @dev Retrieves the total supply at the time `snapshotId` was created.\\n     */\\n    function totalSupplyAt(uint256 snapshotId) public view virtual returns (uint256) {\\n        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshots);\\n\\n        return snapshotted ? value : totalSupply();\\n    }\\n\\n    // Update balance and/or total supply snapshots before the values are modified. This is implemented\\n    // in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual override {\\n        super._beforeTokenTransfer(from, to, amount);\\n\\n        if (from == address(0)) {\\n            // mint\\n            _updateAccountSnapshot(to);\\n            _updateTotalSupplySnapshot();\\n        } else if (to == address(0)) {\\n            // burn\\n            _updateAccountSnapshot(from);\\n            _updateTotalSupplySnapshot();\\n        } else {\\n            // transfer\\n            _updateAccountSnapshot(from);\\n            _updateAccountSnapshot(to);\\n        }\\n    }\\n\\n    function _valueAt(uint256 snapshotId, Snapshots storage snapshots) private view returns (bool, uint256) {\\n        require(snapshotId > 0, \\\"ERC20Snapshot: id is 0\\\");\\n        require(snapshotId <= _getCurrentSnapshotId(), \\\"ERC20Snapshot: nonexistent id\\\");\\n\\n        // When a valid snapshot is queried, there are three possibilities:\\n        //  a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never\\n        //  created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds\\n        //  to this id is the current one.\\n        //  b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the\\n        //  requested id, and its value is the one to return.\\n        //  c) More snapshots were created after the requested one, and the queried value was later modified. There will be\\n        //  no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is\\n        //  larger than the requested one.\\n        //\\n        // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if\\n        // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does\\n        // exactly this.\\n\\n        uint256 index = snapshots.ids.findUpperBound(snapshotId);\\n\\n        if (index == snapshots.ids.length) {\\n            return (false, 0);\\n        } else {\\n            return (true, snapshots.values[index]);\\n        }\\n    }\\n\\n    function _updateAccountSnapshot(address account) private {\\n        _updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account));\\n    }\\n\\n    function _updateTotalSupplySnapshot() private {\\n        _updateSnapshot(_totalSupplySnapshots, totalSupply());\\n    }\\n\\n    function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private {\\n        uint256 currentId = _getCurrentSnapshotId();\\n        if (_lastSnapshotId(snapshots.ids) < currentId) {\\n            snapshots.ids.push(currentId);\\n            snapshots.values.push(currentValue);\\n        }\\n    }\\n\\n    function _lastSnapshotId(uint256[] storage ids) private view returns (uint256) {\\n        if (ids.length == 0) {\\n            return 0;\\n        } else {\\n            return ids[ids.length - 1];\\n        }\\n    }\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Interface of the ERC20 standard as defined in the EIP.\\n */\\ninterface IERC20 {\\n    /**\\n     * @dev Returns the amount of tokens in existence.\\n     */\\n    function totalSupply() external view returns (uint256);\\n\\n    /**\\n     * @dev Returns the amount of tokens owned by `account`.\\n     */\\n    function balanceOf(address account) external view returns (uint256);\\n\\n    /**\\n     * @dev Moves `amount` tokens from the caller's account to `to`.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function transfer(address to, uint256 amount) external returns (bool);\\n\\n    /**\\n     * @dev Returns the remaining number of tokens that `spender` will be\\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\\n     * zero by default.\\n     *\\n     * This value changes when {approve} or {transferFrom} are called.\\n     */\\n    function allowance(address owner, address spender) external view returns (uint256);\\n\\n    /**\\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\\n     * that someone may use both the old and the new allowance by unfortunate\\n     * transaction ordering. One possible solution to mitigate this race\\n     * condition is to first reduce the spender's allowance to 0 and set the\\n     * desired value afterwards:\\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\\n     *\\n     * Emits an {Approval} event.\\n     */\\n    function approve(address spender, uint256 amount) external returns (bool);\\n\\n    /**\\n     * @dev Moves `amount` tokens from `from` to `to` using the\\n     * allowance mechanism. `amount` is then deducted from the caller's\\n     * allowance.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) external returns (bool);\\n\\n    /**\\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\\n     * another (`to`).\\n     *\\n     * Note that `value` may be zero.\\n     */\\n    event Transfer(address indexed from, address indexed to, uint256 value);\\n\\n    /**\\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\\n     * a call to {approve}. `value` is the new allowance.\\n     */\\n    event Approval(address indexed owner, address indexed spender, uint256 value);\\n}\\n\"},\"@openzeppelin/contracts/token/ERC20/ERC20.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./IERC20.sol\\\";\\nimport \\\"./extensions/IERC20Metadata.sol\\\";\\nimport \\\"../../utils/Context.sol\\\";\\n\\n/**\\n * @dev Implementation of the {IERC20} interface.\\n *\\n * This implementation is agnostic to the way tokens are created. This means\\n * that a supply mechanism has to be added in a derived contract using {_mint}.\\n * For a generic mechanism see {ERC20PresetMinterPauser}.\\n *\\n * TIP: For a detailed writeup see our guide\\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\\n * to implement supply mechanisms].\\n *\\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\\n * instead returning `false` on failure. This behavior is nonetheless\\n * conventional and does not conflict with the expectations of ERC20\\n * applications.\\n *\\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\\n * This allows applications to reconstruct the allowance for all accounts just\\n * by listening to said events. Other implementations of the EIP may not emit\\n * these events, as it isn't required by the specification.\\n *\\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\\n * functions have been added to mitigate the well-known issues around setting\\n * allowances. See {IERC20-approve}.\\n */\\ncontract ERC20 is Context, IERC20, IERC20Metadata {\\n    mapping(address => uint256) private _balances;\\n\\n    mapping(address => mapping(address => uint256)) private _allowances;\\n\\n    uint256 private _totalSupply;\\n\\n    string private _name;\\n    string private _symbol;\\n\\n    /**\\n     * @dev Sets the values for {name} and {symbol}.\\n     *\\n     * The default value of {decimals} is 18. To select a different value for\\n     * {decimals} you should overload it.\\n     *\\n     * All two of these values are immutable: they can only be set once during\\n     * construction.\\n     */\\n    constructor(string memory name_, string memory symbol_) {\\n        _name = name_;\\n        _symbol = symbol_;\\n    }\\n\\n    /**\\n     * @dev Returns the name of the token.\\n     */\\n    function name() public view virtual override returns (string memory) {\\n        return _name;\\n    }\\n\\n    /**\\n     * @dev Returns the symbol of the token, usually a shorter version of the\\n     * name.\\n     */\\n    function symbol() public view virtual override returns (string memory) {\\n        return _symbol;\\n    }\\n\\n    /**\\n     * @dev Returns the number of decimals used to get its user representation.\\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\\n     * be displayed to a user as `5.05` (`505 / 10 ** 2`).\\n     *\\n     * Tokens usually opt for a value of 18, imitating the relationship between\\n     * Ether and Wei. This is the value {ERC20} uses, unless this function is\\n     * overridden;\\n     *\\n     * NOTE: This information is only used for _display_ purposes: it in\\n     * no way affects any of the arithmetic of the contract, including\\n     * {IERC20-balanceOf} and {IERC20-transfer}.\\n     */\\n    function decimals() public view virtual override returns (uint8) {\\n        return 18;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-totalSupply}.\\n     */\\n    function totalSupply() public view virtual override returns (uint256) {\\n        return _totalSupply;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-balanceOf}.\\n     */\\n    function balanceOf(address account) public view virtual override returns (uint256) {\\n        return _balances[account];\\n    }\\n\\n    /**\\n     * @dev See {IERC20-transfer}.\\n     *\\n     * Requirements:\\n     *\\n     * - `to` cannot be the zero address.\\n     * - the caller must have a balance of at least `amount`.\\n     */\\n    function transfer(address to, uint256 amount) public virtual override returns (bool) {\\n        address owner = _msgSender();\\n        _transfer(owner, to, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-allowance}.\\n     */\\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\\n        return _allowances[owner][spender];\\n    }\\n\\n    /**\\n     * @dev See {IERC20-approve}.\\n     *\\n     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\\n     * `transferFrom`. This is semantically equivalent to an infinite approval.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     */\\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\\n        address owner = _msgSender();\\n        _approve(owner, spender, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-transferFrom}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance. This is not\\n     * required by the EIP. See the note at the beginning of {ERC20}.\\n     *\\n     * NOTE: Does not update the allowance if the current allowance\\n     * is the maximum `uint256`.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` and `to` cannot be the zero address.\\n     * - `from` must have a balance of at least `amount`.\\n     * - the caller must have allowance for ``from``'s tokens of at least\\n     * `amount`.\\n     */\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) public virtual override returns (bool) {\\n        address spender = _msgSender();\\n        _spendAllowance(from, spender, amount);\\n        _transfer(from, to, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\\n     *\\n     * This is an alternative to {approve} that can be used as a mitigation for\\n     * problems described in {IERC20-approve}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     */\\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\\n        address owner = _msgSender();\\n        _approve(owner, spender, _allowances[owner][spender] + addedValue);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\\n     *\\n     * This is an alternative to {approve} that can be used as a mitigation for\\n     * problems described in {IERC20-approve}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     * - `spender` must have allowance for the caller of at least\\n     * `subtractedValue`.\\n     */\\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\\n        address owner = _msgSender();\\n        uint256 currentAllowance = _allowances[owner][spender];\\n        require(currentAllowance >= subtractedValue, \\\"ERC20: decreased allowance below zero\\\");\\n        unchecked {\\n            _approve(owner, spender, currentAllowance - subtractedValue);\\n        }\\n\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Moves `amount` of tokens from `sender` to `recipient`.\\n     *\\n     * This internal function is equivalent to {transfer}, and can be used to\\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\\n     *\\n     * Emits a {Transfer} event.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     * - `from` must have a balance of at least `amount`.\\n     */\\n    function _transfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {\\n        require(from != address(0), \\\"ERC20: transfer from the zero address\\\");\\n        require(to != address(0), \\\"ERC20: transfer to the zero address\\\");\\n\\n        _beforeTokenTransfer(from, to, amount);\\n\\n        uint256 fromBalance = _balances[from];\\n        require(fromBalance >= amount, \\\"ERC20: transfer amount exceeds balance\\\");\\n        unchecked {\\n            _balances[from] = fromBalance - amount;\\n        }\\n        _balances[to] += amount;\\n\\n        emit Transfer(from, to, amount);\\n\\n        _afterTokenTransfer(from, to, amount);\\n    }\\n\\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\\n     * the total supply.\\n     *\\n     * Emits a {Transfer} event with `from` set to the zero address.\\n     *\\n     * Requirements:\\n     *\\n     * - `account` cannot be the zero address.\\n     */\\n    function _mint(address account, uint256 amount) internal virtual {\\n        require(account != address(0), \\\"ERC20: mint to the zero address\\\");\\n\\n        _beforeTokenTransfer(address(0), account, amount);\\n\\n        _totalSupply += amount;\\n        _balances[account] += amount;\\n        emit Transfer(address(0), account, amount);\\n\\n        _afterTokenTransfer(address(0), account, amount);\\n    }\\n\\n    /**\\n     * @dev Destroys `amount` tokens from `account`, reducing the\\n     * total supply.\\n     *\\n     * Emits a {Transfer} event with `to` set to the zero address.\\n     *\\n     * Requirements:\\n     *\\n     * - `account` cannot be the zero address.\\n     * - `account` must have at least `amount` tokens.\\n     */\\n    function _burn(address account, uint256 amount) internal virtual {\\n        require(account != address(0), \\\"ERC20: burn from the zero address\\\");\\n\\n        _beforeTokenTransfer(account, address(0), amount);\\n\\n        uint256 accountBalance = _balances[account];\\n        require(accountBalance >= amount, \\\"ERC20: burn amount exceeds balance\\\");\\n        unchecked {\\n            _balances[account] = accountBalance - amount;\\n        }\\n        _totalSupply -= amount;\\n\\n        emit Transfer(account, address(0), amount);\\n\\n        _afterTokenTransfer(account, address(0), amount);\\n    }\\n\\n    /**\\n     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\\n     *\\n     * This internal function is equivalent to `approve`, and can be used to\\n     * e.g. set automatic allowances for certain subsystems, etc.\\n     *\\n     * Emits an {Approval} event.\\n     *\\n     * Requirements:\\n     *\\n     * - `owner` cannot be the zero address.\\n     * - `spender` cannot be the zero address.\\n     */\\n    function _approve(\\n        address owner,\\n        address spender,\\n        uint256 amount\\n    ) internal virtual {\\n        require(owner != address(0), \\\"ERC20: approve from the zero address\\\");\\n        require(spender != address(0), \\\"ERC20: approve to the zero address\\\");\\n\\n        _allowances[owner][spender] = amount;\\n        emit Approval(owner, spender, amount);\\n    }\\n\\n    /**\\n     * @dev Spend `amount` form the allowance of `owner` toward `spender`.\\n     *\\n     * Does not update the allowance amount in case of infinite allowance.\\n     * Revert if not enough allowance is available.\\n     *\\n     * Might emit an {Approval} event.\\n     */\\n    function _spendAllowance(\\n        address owner,\\n        address spender,\\n        uint256 amount\\n    ) internal virtual {\\n        uint256 currentAllowance = allowance(owner, spender);\\n        if (currentAllowance != type(uint256).max) {\\n            require(currentAllowance >= amount, \\\"ERC20: insufficient allowance\\\");\\n            unchecked {\\n                _approve(owner, spender, currentAllowance - amount);\\n            }\\n        }\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any transfer of tokens. This includes\\n     * minting and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\\n     * will be transferred to `to`.\\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\\n     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {}\\n\\n    /**\\n     * @dev Hook that is called after any transfer of tokens. This includes\\n     * minting and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\\n     * has been transferred to `to`.\\n     * - when `from` is zero, `amount` tokens have been minted for `to`.\\n     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _afterTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {}\\n}\\n\"},\"@openzeppelin/contracts/access/IAccessControl.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev External interface of AccessControl declared to support ERC165 detection.\\n */\\ninterface IAccessControl {\\n    /**\\n     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`\\n     *\\n     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite\\n     * {RoleAdminChanged} not being emitted signaling this.\\n     *\\n     * _Available since v3.1._\\n     */\\n    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);\\n\\n    /**\\n     * @dev Emitted when `account` is granted `role`.\\n     *\\n     * `sender` is the account that originated the contract call, an admin role\\n     * bearer except when using {AccessControl-_setupRole}.\\n     */\\n    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);\\n\\n    /**\\n     * @dev Emitted when `account` is revoked `role`.\\n     *\\n     * `sender` is the account that originated the contract call:\\n     *   - if using `revokeRole`, it is the admin role bearer\\n     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)\\n     */\\n    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);\\n\\n    /**\\n     * @dev Returns `true` if `account` has been granted `role`.\\n     */\\n    function hasRole(bytes32 role, address account) external view returns (bool);\\n\\n    /**\\n     * @dev Returns the admin role that controls `role`. See {grantRole} and\\n     * {revokeRole}.\\n     *\\n     * To change a role's admin, use {AccessControl-_setRoleAdmin}.\\n     */\\n    function getRoleAdmin(bytes32 role) external view returns (bytes32);\\n\\n    /**\\n     * @dev Grants `role` to `account`.\\n     *\\n     * If `account` had not been already granted `role`, emits a {RoleGranted}\\n     * event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must have ``role``'s admin role.\\n     */\\n    function grantRole(bytes32 role, address account) external;\\n\\n    /**\\n     * @dev Revokes `role` from `account`.\\n     *\\n     * If `account` had been granted `role`, emits a {RoleRevoked} event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must have ``role``'s admin role.\\n     */\\n    function revokeRole(bytes32 role, address account) external;\\n\\n    /**\\n     * @dev Revokes `role` from the calling account.\\n     *\\n     * Roles are often managed via {grantRole} and {revokeRole}: this function's\\n     * purpose is to provide a mechanism for accounts to lose their privileges\\n     * if they are compromised (such as when a trusted device is misplaced).\\n     *\\n     * If the calling account had been granted `role`, emits a {RoleRevoked}\\n     * event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must be `account`.\\n     */\\n    function renounceRole(bytes32 role, address account) external;\\n}\\n\"},\"@openzeppelin/contracts/access/AccessControl.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControl.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./IAccessControl.sol\\\";\\nimport \\\"../utils/Context.sol\\\";\\nimport \\\"../utils/Strings.sol\\\";\\nimport \\\"../utils/introspection/ERC165.sol\\\";\\n\\n/**\\n * @dev Contract module that allows children to implement role-based access\\n * control mechanisms. This is a lightweight version that doesn't allow enumerating role\\n * members except through off-chain means by accessing the contract event logs. Some\\n * applications may benefit from on-chain enumerability, for those cases see\\n * {AccessControlEnumerable}.\\n *\\n * Roles are referred to by their `bytes32` identifier. These should be exposed\\n * in the external API and be unique. The best way to achieve this is by\\n * using `public constant` hash digests:\\n *\\n * ```\\n * bytes32 public constant MY_ROLE = keccak256(\\\"MY_ROLE\\\");\\n * ```\\n *\\n * Roles can be used to represent a set of permissions. To restrict access to a\\n * function call, use {hasRole}:\\n *\\n * ```\\n * function foo() public {\\n *     require(hasRole(MY_ROLE, msg.sender));\\n *     ...\\n * }\\n * ```\\n *\\n * Roles can be granted and revoked dynamically via the {grantRole} and\\n * {revokeRole} functions. Each role has an associated admin role, and only\\n * accounts that have a role's admin role can call {grantRole} and {revokeRole}.\\n *\\n * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means\\n * that only accounts with this role will be able to grant or revoke other\\n * roles. More complex role relationships can be created by using\\n * {_setRoleAdmin}.\\n *\\n * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to\\n * grant and revoke this role. Extra precautions should be taken to secure\\n * accounts that have been granted it.\\n */\\nabstract contract AccessControl is Context, IAccessControl, ERC165 {\\n    struct RoleData {\\n        mapping(address => bool) members;\\n        bytes32 adminRole;\\n    }\\n\\n    mapping(bytes32 => RoleData) private _roles;\\n\\n    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;\\n\\n    /**\\n     * @dev Modifier that checks that an account has a specific role. Reverts\\n     * with a standardized message including the required role.\\n     *\\n     * The format of the revert reason is given by the following regular expression:\\n     *\\n     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/\\n     *\\n     * _Available since v4.1._\\n     */\\n    modifier onlyRole(bytes32 role) {\\n        _checkRole(role, _msgSender());\\n        _;\\n    }\\n\\n    /**\\n     * @dev See {IERC165-supportsInterface}.\\n     */\\n    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\\n        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);\\n    }\\n\\n    /**\\n     * @dev Returns `true` if `account` has been granted `role`.\\n     */\\n    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {\\n        return _roles[role].members[account];\\n    }\\n\\n    /**\\n     * @dev Revert with a standard message if `account` is missing `role`.\\n     *\\n     * The format of the revert reason is given by the following regular expression:\\n     *\\n     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/\\n     */\\n    function _checkRole(bytes32 role, address account) internal view virtual {\\n        if (!hasRole(role, account)) {\\n            revert(\\n                string(\\n                    abi.encodePacked(\\n                        \\\"AccessControl: account \\\",\\n                        Strings.toHexString(uint160(account), 20),\\n                        \\\" is missing role \\\",\\n                        Strings.toHexString(uint256(role), 32)\\n                    )\\n                )\\n            );\\n        }\\n    }\\n\\n    /**\\n     * @dev Returns the admin role that controls `role`. See {grantRole} and\\n     * {revokeRole}.\\n     *\\n     * To change a role's admin, use {_setRoleAdmin}.\\n     */\\n    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {\\n        return _roles[role].adminRole;\\n    }\\n\\n    /**\\n     * @dev Grants `role` to `account`.\\n     *\\n     * If `account` had not been already granted `role`, emits a {RoleGranted}\\n     * event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must have ``role``'s admin role.\\n     */\\n    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {\\n        _grantRole(role, account);\\n    }\\n\\n    /**\\n     * @dev Revokes `role` from `account`.\\n     *\\n     * If `account` had been granted `role`, emits a {RoleRevoked} event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must have ``role``'s admin role.\\n     */\\n    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {\\n        _revokeRole(role, account);\\n    }\\n\\n    /**\\n     * @dev Revokes `role` from the calling account.\\n     *\\n     * Roles are often managed via {grantRole} and {revokeRole}: this function's\\n     * purpose is to provide a mechanism for accounts to lose their privileges\\n     * if they are compromised (such as when a trusted device is misplaced).\\n     *\\n     * If the calling account had been revoked `role`, emits a {RoleRevoked}\\n     * event.\\n     *\\n     * Requirements:\\n     *\\n     * - the caller must be `account`.\\n     */\\n    function renounceRole(bytes32 role, address account) public virtual override {\\n        require(account == _msgSender(), \\\"AccessControl: can only renounce roles for self\\\");\\n\\n        _revokeRole(role, account);\\n    }\\n\\n    /**\\n     * @dev Grants `role` to `account`.\\n     *\\n     * If `account` had not been already granted `role`, emits a {RoleGranted}\\n     * event. Note that unlike {grantRole}, this function doesn't perform any\\n     * checks on the calling account.\\n     *\\n     * [WARNING]\\n     * ====\\n     * This function should only be called from the constructor when setting\\n     * up the initial roles for the system.\\n     *\\n     * Using this function in any other way is effectively circumventing the admin\\n     * system imposed by {AccessControl}.\\n     * ====\\n     *\\n     * NOTE: This function is deprecated in favor of {_grantRole}.\\n     */\\n    function _setupRole(bytes32 role, address account) internal virtual {\\n        _grantRole(role, account);\\n    }\\n\\n    /**\\n     * @dev Sets `adminRole` as ``role``'s admin role.\\n     *\\n     * Emits a {RoleAdminChanged} event.\\n     */\\n    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {\\n        bytes32 previousAdminRole = getRoleAdmin(role);\\n        _roles[role].adminRole = adminRole;\\n        emit RoleAdminChanged(role, previousAdminRole, adminRole);\\n    }\\n\\n    /**\\n     * @dev Grants `role` to `account`.\\n     *\\n     * Internal function without access restriction.\\n     */\\n    function _grantRole(bytes32 role, address account) internal virtual {\\n        if (!hasRole(role, account)) {\\n            _roles[role].members[account] = true;\\n            emit RoleGranted(role, account, _msgSender());\\n        }\\n    }\\n\\n    /**\\n     * @dev Revokes `role` from `account`.\\n     *\\n     * Internal function without access restriction.\\n     */\\n    function _revokeRole(bytes32 role, address account) internal virtual {\\n        if (hasRole(role, account)) {\\n            _roles[role].members[account] = false;\\n            emit RoleRevoked(role, account, _msgSender());\\n        }\\n    }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":false,\"runs\":200},\"evmVersion\":\"london\",\"libraries\":{}}}",
  "codeformat": "solidity-standard-json-input",
  "contractname": "/contracts/polygon/Aida.sol:Aida",
  "compilerversion": "v0.8.13+commit.abaa5c0e",
  "constructorArguements": ""
}
Checking status of verification request rzqebhurtki3tdgvacp4p4ysjkpnssnsig7pscbzjkg7xwkxwp
Fail - Unable to verify
Failed to verify 1 contract(s): Aida@0x4ece0883273d6e71ed70F772A67B99417Db14c71

I Tried the sample "SimpleStorage" contract (which comes with the Polygon box) which works fine. It was even verified on deploy already! So the network is in ok shape I suppose.

🤘  truffle migrate --config=truffle-config.polygon.js --network=matic

Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.

Starting migrations...
======================
> Network name:    'matic'
> Network id:      80001
> Block gas limit: 20000000 (0x1312d00)

1_deploy_simple_storage.js
==========================

   Deploying 'SimpleStorage'
   -------------------------
   > transaction hash:    0xfb4b970e87e3ce69f8c51b386f0afc0ff567564b9035bddf81040be8c861bc79
   > Blocks: 2            Seconds: 8
   > contract address:    0xa81ce5A11112a866F54c6d92F29eB2DF9a75CE34
   > block number:        26090996
   > block timestamp:     1650960302
   > account:             0x08Bc5eb07334C157BC973d4921D8ABDcf0490FdE
   > balance:             0.185899881381896358
   > gas used:            96189 (0x177bd)
   > gas price:           1.500000013 gwei
   > value sent:          0 ETH
   > total cost:          0.000144283501250457 ETH

   Pausing for 2 confirmations...

   -------------------------------
   > confirmation number: 1 (block: 26090997)
   > confirmation number: 2 (block: 26090998)
   > Saving artifacts
   -------------------------------------
   > Total cost:     0.000144283501250457 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.000144283501250457 ETH

truffle run verify --config=truffle-config.polygon.js SimpleStorage --network=matic
Verifying SimpleStorage
Already Verified: https://mumbai.polygonscan.com/address/0xa81ce5A11112a866F54c6d92F29eB2DF9a75CE34#code
Successfully verified 1 contract(s).

[transcental]

Having the same issue with Kovan network:

Debug Log

```zsh ± truffle run verify Exchange Token Migrations --network kovan --debug DEBUG logging is turned ON Running truffle-plugin-verify v0.5.25 Retrieving network's network ID & chain ID Verifying Exchange Reading artifact file at /Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/abis/Exchange.json Retrieving constructor parameters from https://api-kovan.etherscan.io/api?apiKey=xxx&module=account&action=txlist&address=0x535Fd0d8bf2FfED94f0c5ef5a18A6a01F4fA6436&page=1&sort=asc&offset=1 Constructor parameters retrieved: 0x00000000000000000000000008c972d307eb19c5b89d3be11d9f55b59be9c7ad000000000000000000000000000000000000000000000000000000000000000a Sending verify request with POST arguments: { "apikey": "xxx", "module": "contract", "action": "verifysourcecode", "contractaddress": "0x535Fd0d8bf2FfED94f0c5ef5a18A6a01F4fA6436", "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Exchange.sol\":{\"content\":\"pragma solidity >=0.4.22 <0.8.0;\\n\\nimport \\\"./Token.sol\\\";\\nimport \\\"openzeppelin-solidity/contracts/math/SafeMath.sol\\\";\\n\\ncontract Exchange {\\n using SafeMath for uint256;\\n\\n uint256 public feePercent;\\n uint256 public orderCount;\\n\\n address public feeAccount;\\n address constant ETHER = address(0); // To store ether in tokens mapping\\n\\n mapping(address => mapping(address => uint256)) public tokens;\\n mapping(uint256 => _Order) public orders;\\n mapping(uint256 => bool) public orderCancelled;\\n mapping(uint256 => bool) public orderFilled;\\n\\n event Deposit(address token, address user, uint256 amount, uint256 balance);\\n event Withdraw(\\n address token,\\n address user,\\n uint256 amount,\\n uint256 balance\\n );\\n event Order(\\n uint256 id,\\n address user,\\n address tokenGet,\\n uint256 amountGet,\\n address tokenGive,\\n uint256 amountGive,\\n uint256 timestamp\\n );\\n event Cancel(\\n uint256 id,\\n address user,\\n address tokenGet,\\n uint256 amountGet,\\n address tokenGive,\\n uint256 amountGive,\\n uint256 timestamp\\n );\\n event Trade(\\n uint256 id,\\n address user,\\n address tokenGet,\\n uint256 amountGet,\\n address tokenGive,\\n uint256 amountGive,\\n address userFill,\\n uint256 timestamp\\n );\\n\\n struct _Order {\\n uint256 id;\\n address user;\\n address tokenGet;\\n uint256 amountGet;\\n address tokenGive;\\n uint256 amountGive;\\n uint256 timestamp;\\n }\\n\\n constructor(address _feeAccount, uint256 _feePercent) public {\\n feeAccount = _feeAccount;\\n feePercent = _feePercent;\\n }\\n\\n // Fallback reverts if ether is sent to the smart contract\\n function() external {\\n revert();\\n }\\n\\n function depositEther() public payable {\\n tokens[ETHER][msg.sender] = tokens[ETHER][msg.sender].add(msg.value);\\n emit Deposit(ETHER, msg.sender, msg.value, tokens[ETHER][msg.sender]);\\n }\\n\\n function withdrawEther(uint256 _amount) public {\\n require(tokens[ETHER][msg.sender] >= _amount);\\n tokens[ETHER][msg.sender] = tokens[ETHER][msg.sender].sub(_amount);\\n msg.sender.transfer(_amount);\\n emit Withdraw(ETHER, msg.sender, _amount, tokens[ETHER][msg.sender]);\\n }\\n\\n function depositToken(address _token, uint256 _amount) public {\\n require(_token != ETHER);\\n require(Token(_token).transferFrom(msg.sender, address(this), _amount));\\n tokens[_token][msg.sender] = tokens[_token][msg.sender].add(_amount);\\n emit Deposit(_token, msg.sender, _amount, tokens[_token][msg.sender]);\\n }\\n\\n function withdrawToken(address _token, uint256 _amount) public {\\n require(_token != ETHER);\\n require(tokens[_token][msg.sender] >= _amount);\\n tokens[_token][msg.sender] = tokens[_token][msg.sender].sub(_amount);\\n require(Token(_token).transfer(msg.sender, _amount));\\n emit Withdraw(_token, msg.sender, _amount, tokens[_token][msg.sender]);\\n }\\n\\n function balanceOf(address _token, address _user)\\n public\\n view\\n returns (uint256)\\n {\\n return tokens[_token][_user];\\n }\\n\\n function makeOrder(\\n address _tokenGet,\\n uint256 _amountGet,\\n address _tokenGive,\\n uint256 _amountGive\\n ) public {\\n orderCount = orderCount.add(1);\\n orders[orderCount] = _Order(\\n orderCount,\\n msg.sender,\\n _tokenGet,\\n _amountGet,\\n _tokenGive,\\n _amountGive,\\n now\\n );\\n emit Order(\\n orderCount,\\n msg.sender,\\n _tokenGet,\\n _amountGet,\\n _tokenGive,\\n _amountGive,\\n now\\n );\\n }\\n\\n function cancelOrder(uint256 _id) public {\\n _Order storage _order = orders[_id];\\n require(\\n _order.user == msg.sender,\\n \\\"Only order creator can cancel order\\\"\\n );\\n require(_order.id == _id, \\\"Order id does not match\\\");\\n orderCancelled[_id] = true;\\n emit Cancel(\\n _order.id,\\n msg.sender,\\n _order.tokenGet,\\n _order.amountGet,\\n _order.tokenGive,\\n _order.amountGive,\\n _order.timestamp\\n );\\n }\\n\\n function fillOrder(uint256 _id) public {\\n require(_id > 0 && _id <= orderCount, \\\"Invalid order id\\\");\\n require(!orderFilled[_id], \\\"Order already filled\\\");\\n require(!orderCancelled[_id], \\\"Order already cancelled\\\");\\n _Order storage _order = orders[_id];\\n _trade(\\n _order.id,\\n _order.user,\\n _order.tokenGet,\\n _order.amountGet,\\n _order.tokenGive,\\n _order.amountGive\\n );\\n orderFilled[_order.id] = true;\\n }\\n\\n function _trade(\\n uint256 _orderId,\\n address _user,\\n address _tokenGet,\\n uint256 _amountGet,\\n address _tokenGive,\\n uint256 _amountGive\\n ) internal {\\n uint256 _feeAmount = _amountGive.mul(feePercent).div(100);\\n\\n tokens[_tokenGet][msg.sender] = tokens[_tokenGet][msg.sender].sub(\\n _amountGet.add(_feeAmount)\\n );\\n tokens[_tokenGet][_user] = tokens[_tokenGet][_user].add(_amountGet);\\n tokens[_tokenGet][feeAccount] = tokens[_tokenGet][feeAccount].add(\\n _feeAmount\\n );\\n tokens[_tokenGive][msg.sender] = tokens[_tokenGive][msg.sender].add(\\n _amountGive\\n );\\n tokens[_tokenGive][_user] = tokens[_tokenGive][_user].sub(_amountGive);\\n\\n emit Trade(\\n _orderId,\\n _user,\\n _tokenGet,\\n _amountGet,\\n _tokenGive,\\n _amountGive,\\n msg.sender,\\n now\\n );\\n }\\n}\\n\"},\"openzeppelin-solidity/contracts/math/SafeMath.sol\":{\"content\":\"pragma solidity ^0.5.0;\\n\\n/**\\n * @title SafeMath\\n * @dev Unsigned math operations with safety checks that revert on error\\n */\\nlibrary SafeMath {\\n /**\\n * @dev Multiplies two unsigned integers, reverts on overflow.\\n */\\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\\n // benefit is lost if 'b' is also tested.\\n // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522\\n if (a == 0) {\\n return 0;\\n }\\n\\n uint256 c = a * b;\\n require(c / a == b);\\n\\n return c;\\n }\\n\\n /**\\n * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.\\n */\\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\\n // Solidity only automatically asserts when dividing by 0\\n require(b > 0);\\n uint256 c = a / b;\\n // assert(a == b * c + a % b); // There is no case in which this doesn't hold\\n\\n return c;\\n }\\n\\n /**\\n * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).\\n */\\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\\n require(b <= a);\\n uint256 c = a - b;\\n\\n return c;\\n }\\n\\n /**\\n * @dev Adds two unsigned integers, reverts on overflow.\\n */\\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\\n uint256 c = a + b;\\n require(c >= a);\\n\\n return c;\\n }\\n\\n /**\\n * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),\\n * reverts when dividing by zero.\\n */\\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\\n require(b != 0);\\n return a % b;\\n }\\n}\\n\"},\"/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Token.sol\":{\"content\":\"pragma solidity ^0.5.0;\\n\\nimport \\\"openzeppelin-solidity/contracts/math/SafeMath.sol\\\";\\n\\ncontract Token {\\n using SafeMath for uint256;\\n\\n string public name = \\\"Dillium\\\";\\n string public symbol = \\\"DIL\\\";\\n uint256 public decimals = 18;\\n uint256 public totalSupply;\\n mapping(address => uint256) public balanceOf;\\n mapping(address => mapping(address => uint256)) public allowance;\\n\\n event Transfer(address indexed from, address indexed to, uint256 value);\\n event Approval(\\n address indexed owner,\\n address indexed spender,\\n uint256 value\\n );\\n\\n constructor() public {\\n totalSupply = 1000000 * (10**decimals);\\n balanceOf[msg.sender] = totalSupply;\\n }\\n\\n function transfer(address _to, uint256 _value)\\n public\\n returns (bool success)\\n {\\n require(balanceOf[msg.sender] >= _value); // Check if they have enough tokens\\n _transfer(msg.sender, _to, _value);\\n return true;\\n }\\n\\n function _transfer(\\n address _from,\\n address _to,\\n uint256 _value\\n ) internal {\\n require(_to != address(0)); // Check if the address is valid\\n balanceOf[_from] = balanceOf[_from].sub(_value);\\n balanceOf[_to] = balanceOf[_to].add(_value);\\n emit Transfer(_from, _to, _value);\\n }\\n\\n function approve(address _spender, uint256 _value)\\n public\\n returns (bool success)\\n {\\n require(_spender != address(0));\\n allowance[msg.sender][_spender] = _value;\\n emit Approval(msg.sender, _spender, _value);\\n return true;\\n }\\n\\n function transferFrom(\\n address _from,\\n address _to,\\n uint256 _value\\n ) public returns (bool success) {\\n require(_value <= balanceOf[_from]);\\n require(_value <= allowance[_from][msg.sender]);\\n allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);\\n _transfer(_from, _to, _value);\\n return true;\\n }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":false,\"runs\":200},\"evmVersion\":\"istanbul\",\"libraries\":{}}}", "codeformat": "solidity-standard-json-input", "contractname": "/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Exchange.sol:Exchange", "compilerversion": "v0.5.16+commit.9c3226ce", "constructorArguements": "00000000000000000000000008c972d307eb19c5b89d3be11d9f55b59be9c7ad000000000000000000000000000000000000000000000000000000000000000a" } Checking status of verification request etnenfxejnthwwqr1cdcyehcipplygkzi4glr8ekd7h6cvqwvy Fail - Unable to verify Verifying Token Reading artifact file at /Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/abis/Token.json Retrieving constructor parameters from https://api-kovan.etherscan.io/api?apiKey=xxx&module=account&action=txlist&address=0x1Ae447a3C27D379c51571a3A78976e0c27Fc977B&page=1&sort=asc&offset=1 Constructor parameters retrieved: 0x Sending verify request with POST arguments: { "apikey": "xxx", "module": "contract", "action": "verifysourcecode", "contractaddress": "0x1Ae447a3C27D379c51571a3A78976e0c27Fc977B", "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Token.sol\":{\"content\":\"pragma solidity ^0.5.0;\\n\\nimport \\\"openzeppelin-solidity/contracts/math/SafeMath.sol\\\";\\n\\ncontract Token {\\n using SafeMath for uint256;\\n\\n string public name = \\\"Dillium\\\";\\n string public symbol = \\\"DIL\\\";\\n uint256 public decimals = 18;\\n uint256 public totalSupply;\\n mapping(address => uint256) public balanceOf;\\n mapping(address => mapping(address => uint256)) public allowance;\\n\\n event Transfer(address indexed from, address indexed to, uint256 value);\\n event Approval(\\n address indexed owner,\\n address indexed spender,\\n uint256 value\\n );\\n\\n constructor() public {\\n totalSupply = 1000000 * (10**decimals);\\n balanceOf[msg.sender] = totalSupply;\\n }\\n\\n function transfer(address _to, uint256 _value)\\n public\\n returns (bool success)\\n {\\n require(balanceOf[msg.sender] >= _value); // Check if they have enough tokens\\n _transfer(msg.sender, _to, _value);\\n return true;\\n }\\n\\n function _transfer(\\n address _from,\\n address _to,\\n uint256 _value\\n ) internal {\\n require(_to != address(0)); // Check if the address is valid\\n balanceOf[_from] = balanceOf[_from].sub(_value);\\n balanceOf[_to] = balanceOf[_to].add(_value);\\n emit Transfer(_from, _to, _value);\\n }\\n\\n function approve(address _spender, uint256 _value)\\n public\\n returns (bool success)\\n {\\n require(_spender != address(0));\\n allowance[msg.sender][_spender] = _value;\\n emit Approval(msg.sender, _spender, _value);\\n return true;\\n }\\n\\n function transferFrom(\\n address _from,\\n address _to,\\n uint256 _value\\n ) public returns (bool success) {\\n require(_value <= balanceOf[_from]);\\n require(_value <= allowance[_from][msg.sender]);\\n allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);\\n _transfer(_from, _to, _value);\\n return true;\\n }\\n}\\n\"},\"openzeppelin-solidity/contracts/math/SafeMath.sol\":{\"content\":\"pragma solidity ^0.5.0;\\n\\n/**\\n * @title SafeMath\\n * @dev Unsigned math operations with safety checks that revert on error\\n */\\nlibrary SafeMath {\\n /**\\n * @dev Multiplies two unsigned integers, reverts on overflow.\\n */\\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\\n // benefit is lost if 'b' is also tested.\\n // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522\\n if (a == 0) {\\n return 0;\\n }\\n\\n uint256 c = a * b;\\n require(c / a == b);\\n\\n return c;\\n }\\n\\n /**\\n * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.\\n */\\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\\n // Solidity only automatically asserts when dividing by 0\\n require(b > 0);\\n uint256 c = a / b;\\n // assert(a == b * c + a % b); // There is no case in which this doesn't hold\\n\\n return c;\\n }\\n\\n /**\\n * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).\\n */\\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\\n require(b <= a);\\n uint256 c = a - b;\\n\\n return c;\\n }\\n\\n /**\\n * @dev Adds two unsigned integers, reverts on overflow.\\n */\\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\\n uint256 c = a + b;\\n require(c >= a);\\n\\n return c;\\n }\\n\\n /**\\n * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),\\n * reverts when dividing by zero.\\n */\\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\\n require(b != 0);\\n return a % b;\\n }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":false,\"runs\":200},\"evmVersion\":\"istanbul\",\"libraries\":{}}}", "codeformat": "solidity-standard-json-input", "contractname": "/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Token.sol:Token", "compilerversion": "v0.5.16+commit.9c3226ce", "constructorArguements": "" } Checking status of verification request dpph8zlbvzql6e3uzsf5asysaswcqmysqz4wb1wg1fdevs1e4i Fail - Unable to verify Verifying Migrations Reading artifact file at /Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/abis/Migrations.json Retrieving constructor parameters from https://api-kovan.etherscan.io/api?apiKey=xxx&module=account&action=txlist&address=0x6AFc68e037946F1Bb2E1b9cb9feb962Bee159832&page=1&sort=asc&offset=1 Constructor parameters retrieved: 0x Sending verify request with POST arguments: { "apikey": "xxxx", "module": "contract", "action": "verifysourcecode", "contractaddress": "0x6AFc68e037946F1Bb2E1b9cb9feb962Bee159832", "sourceCode": "{\"language\":\"Solidity\",\"sources\":{\"/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Migrations.sol\":{\"content\":\"// SPDX-License-Identifier: MIT\\npragma solidity >=0.4.22 <0.8.0;\\n\\ncontract Migrations {\\n address public owner = msg.sender;\\n uint public last_completed_migration;\\n\\n modifier restricted() {\\n require(\\n msg.sender == owner,\\n \\\"This function is restricted to the contract's owner\\\"\\n );\\n _;\\n }\\n\\n function setCompleted(uint completed) public restricted {\\n last_completed_migration = completed;\\n }\\n}\\n\"}},\"settings\":{\"remappings\":[],\"optimizer\":{\"enabled\":false,\"runs\":200},\"evmVersion\":\"istanbul\",\"libraries\":{}}}", "codeformat": "solidity-standard-json-input", "contractname": "/Users/dillonbarnes/Documents/Coding/Blockchain:Solidity:Web3/Bootcamp/blockchain-developer-bootcamp/src/contracts/Migrations.sol:Migrations", "compilerversion": "v0.5.16+commit.9c3226ce", "constructorArguements": "" } Checking status of verification request wxgrykrxif49l81xv7b6jywq5ufjnhsiz7qsby2iv4igdru6ey Fail - Unable to verify Failed to verify 3 contract(s): Exchange, Token, Migrations ```

[gfaraj]

Having a similar issue on Polygon:

   Unable to locate ContractCode at 0xXYZ
   Failed to verify 1 contract(s): Activity

[OnahProsperity]

A major reason for the issue that I notice is when your import is from a directory then you are likely going to witness that. instance if your import is this way: import "./interface/IERC20.sol"; making it something like this might not work, I had to change mine to something like this import "./IERC20.sol"; before it worked on BSC testnet.

[DannyDevil0]

Same issue

[ChristianVermeulen]

Hi,

I have retired this mailbox so please stop sending email here. If you have good reason to contact me, you should be able to figure out an alternative way to get in touch ;-).

Kind regards, Christian Vermeulen

[filipepros]

Same issue here. It used to work. Also on mumbai

[0xV4L3NT1N3]

gm all, chiming in here from Etherscan, can confirm we had issues with FTM Testnet which we've since looked into.

I've deployed and verified a contract to FTM Testnet and Mumbai using Truffle ^5.5.2 and Truffle Plugin Verify ^0.5.25

https://mumbai.polygonscan.com/address/0x8B922ac8062eE5Fc743b011d3F2a60d74c57BfEf#code https://testnet.ftmscan.com/address/0xe6d28c51625b7db0f71c0daee12a821e3e2bbe7a

Feel free to ping if you suspect the issue may be with the specific explorer!

[filipepros]

Hi friends, thanks to @0xV4L3NT1N3 I updated Truffle to 5.5.28 and it worked like a charm. Previously 5.4.26. Thanks!

[rkalis]

It appears this issue has been resolved then. Feel free to open a new issue if a similar issue occurs again. In general, it is safe to assume that if verification fails only on certain networks, but succeeds on others, that the issue is a transient issue with the specific explorer.