Tagging Tokens Indicator Interface - Discussion

RandomDecryptor commented 4 years ago

eip: title: Tagging Tokens Indicator Interface author: Francisco (@RandomDecryptor) discussions-to: status: Draft type: Standards Track category: ERC created: 2020-05-02 requires: 20

Simple Summary

Tagging tokens provide a simple way, using compatibility with ERC-20 tokens, to tag certain ethereum addresses. This standard will allow for a simple way to distinguish between normal ERC-20 tokens and taggings tokens.

Abstract

A simple standard just to distinguish normal ERC-20 tokens from tagging tokens.

Motivation

Tagging tokens will allow the tagging of any ethereum address. Users using any wallet that supports standard ERC-20 will be able to see the tags in their wallets. Or using etherscan (or other blockchain explorer's compatible with ERC-20 tokens) see the taggings in the ethereum addresses they want (maybe to check if an address is safe to interact with).

This new interface will allow wallets to easily ignore or separate the tagging tokens if they so choose to.

Specification

solidity
contract ITag {

    function isTag() public constant returns (bool);

    function getTagVersion() public constant returns (bytes4);

}

isTag

Will show if the contract is a tag (tagging token). It will return true in that case.

getTagVersion

Returns the tag version. The version will be a byte array, like the following 1.0.5.2, with each byte being a part of the version. The first byte will be the major version, the second byte the minor version and so on.

Rationale

The main aspect of the interface is, of course, the isTag() function.

With it, wallets and blockchain explorers can detect if the ERC-20 token they are checking is a normal ERC-20 token or a tagging token. The getTagVersion function is to allow for future evolutions, so it's possible to know the version of the Tag.

Tags in its initial version (version 1.0.0.0), will have the following restrictions:

One address A can only tag another address B with a certain tag once;
One address can be tagged with many different tags;
The tag tokens are not transferable, that is, operations that would allow a user to transfer a token after receiving it are blocked (transfer, transferFrom and approve);
Only the user that does a tagging can remove it, that is, if address A has tagged address B previously, only address A can remove its tagging from address B.
The total supply of the token (that corresponds to the Tag) is increased by 1 for each tagging;
The total supply of the token is reduced by 1 for each removal of a tagging;

So tagging tokens would be a subset of ERC-20 tokens with the restrictions mentioned above applied.

Implementation

References

Tagging Tokens

Security Considerations

In terms of just this simple interface, no security issues should emerge.

Only certain privacy problems can maybe appear from the using of Taggings Tokens, if they are used in some way to expose information associated with certain ethereum addresses.

Copyright

Copyright and related rights waived via CC0.

github-actions[bot] commented 2 years ago

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ethereum / EIPs