## Synopsis VaporCoin is a simple blockchain transaction ledger implementation, built in Swift using Vapor. ## Goals Functional, simple and easy to understand implementation that favors learning over robust security and usability. This is not intended to be an 'altcoin' ## Specifications Blocks: - Block time 60 seconds - 6000 transactions per block (Effective 100 txns/s rate) - Block difficulty updated every 60 blocks (hourly) - Block reward 50 full units/block (1 unit = 100 000 000 sub-units) - Block reward halved every 4 years (2 102 400 blocks at 525 600 blocks per year) - Total amount of full units will be roughly ~209 829 375 Transactions: - Simplified Bitcoin-style transactions, UTXO (No scripting capability) - ECDSA signatures Proof of Work (PoW) algorithm: - Simplified Bitcoin-style. Single SHA256 hash of block header Block header: - Previous hash - Merkle root of transactions in block - UNIX timestamp - Target difficulty - Nonce (32 bit) ## TODO - JSON WebSocket p2p communication / Incomplete - Peer discovery - Locally hosted web interface to send and receive transactions, change settings and monitor blockchain status. - Fractional difficulty adjustment (Using BigInt) - Database logic - Proper node syncing - UTXO Transactions - Establish consensus ## Getting started brew install vapor/tap/vapor In project root directory: vapor update vapor build vapor run If you are using Xcode, make sure to select `My Mac` as target, and select the `Run` scheme. ## Difficulty Factor To mine a block, you can lower the diffBits amount in Droplet+Setup.swift line 17: let miner = Miner(coinbase: "coinbaseAddressNotImplementedYet", diffBits: 20, threadCount: 4) ## Tips Get me some coffee: ETH: 0x1e8e9c1a1b71ff88829b962cfa7190d074343b37 LTC: LZc2QcyZGuhHF18s96VAUPpByZq2S8yCsj ZEC: t1UukAm25iRLTyTQfhX6WfRBzMjp8UCmy4a