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About The Project

ERC721S (SoulBound), is a standard for SoulBound Token (non-transferable NFT) coined by Vitalik Buterin in a blog post.

Features

  • Non-transferable: SoulBound
  • Community Recovery: at extreme condition (losing private key), community multisig (contract owner) can transfer the token to the new wallet under the approvement of the token holder.
  • Gas Saving: learn from ERC721A
  • Sybil Identification :each address is associated with an isSybil variable for projects to identify Sybil/bot.
  • Soul Power: each address is associated with an soulPower variable, a score that measures the soul power associated with the addresss (e.g. the contribution score to the project).

Usage

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "https://github.com/SoulBoundProtocol/ERC721S/contracts/ERC721S.sol";

contract SBT is ERC721S {
    constructor() ERC721S("SBT", "SBT") {}

    function mint() external payable {
        // `_mint`'s second argument now takes in a `quantity`, not a `tokenId`.
        _mint(msg.sender, 1);
    }
}