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ERC-20 代币标准
ERC-721 代币标准
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ERC-721（Ethereum Request for Comments 721），由 William Entriken、Dieter Shirley、Jacob Evans、Nastassia Sachs 在 2018 年 1 月提出，是一个在智能合约中实现代币 API 的非同质化代币标准。

它提供了一些功能，例如将代币从一个帐户转移到另一个帐户，获取帐户的当前代币余额，获取代币的所有者，以及整个网络的可用代币总供应量。 除此之外，它还具有其他功能，例如批准帐户中一定数量的代币可以被第三方帐户转移。

如果一个智能合约实现了下列方法和事件，它就可以被称为 ERC-721 非同质化代币合约。 一旦被部署，它将负责跟踪在以太坊上创建的代币。

方法

  1. function balanceOf(address _owner) external view returns (uint256);
  2. function ownerOf(uint256 _tokenId) external view returns (address);
  3. function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external payable;
  4. function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
  5. function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
  6. function approve(address _approved, uint256 _tokenId) external payable;
  7. function setApprovalForAll(address _operator, bool _approved) external;
  8. function getApproved(uint256 _tokenId) external view returns (address);
  9. function isApprovedForAll(address _owner, address _operator) external view returns (bool);

事件

  1. event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
  2. event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
  3. event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

JSON ABI

[
  {
    "inputs": [{ "internalType": "address", "name": "owner", "type": "address" }],
    "name": "balanceOf",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [{ "internalType": "uint256", "name": "tokenId", "type": "uint256" }],
    "name": "ownerOf",
    "outputs": [{ "internalType": "address", "name": "", "type": "address" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "from", "type": "address" },
      { "internalType": "address", "name": "to", "type": "address" },
      { "internalType": "uint256", "name": "tokenId", "type": "uint256" },
      { "internalType": "bytes", "name": "_data", "type": "bytes" }
    ],
    "name": "safeTransferFrom",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "from", "type": "address" },
      { "internalType": "address", "name": "to", "type": "address" },
      { "internalType": "uint256", "name": "tokenId", "type": "uint256" }
    ],
    "name": "safeTransferFrom",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "from", "type": "address" },
      { "internalType": "address", "name": "to", "type": "address" },
      { "internalType": "uint256", "name": "tokenId", "type": "uint256" }
    ],
    "name": "transferFrom",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "to", "type": "address" },
      { "internalType": "uint256", "name": "tokenId", "type": "uint256" }
    ],
    "name": "approve",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "operator", "type": "address" },
      { "internalType": "bool", "name": "approved", "type": "bool" }
    ],
    "name": "setApprovalForAll",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [{ "internalType": "uint256", "name": "tokenId", "type": "uint256" }],
    "name": "getApproved",
    "outputs": [{ "internalType": "address", "name": "", "type": "address" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "owner", "type": "address" },
      { "internalType": "address", "name": "operator", "type": "address" }
    ],
    "name": "isApprovedForAll",
    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "anonymous": false,
    "inputs": [
      { "indexed": true, "internalType": "address", "name": "from", "type": "address" },
      { "indexed": true, "internalType": "address", "name": "to", "type": "address" },
      { "indexed": true, "internalType": "uint256", "name": "tokenId", "type": "uint256" }
    ],
    "name": "Transfer",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      { "indexed": true, "internalType": "address", "name": "owner", "type": "address" },
      { "indexed": true, "internalType": "address", "name": "approved", "type": "address" },
      { "indexed": true, "internalType": "uint256", "name": "tokenId", "type": "uint256" }
    ],
    "name": "Approval",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      { "indexed": true, "internalType": "address", "name": "owner", "type": "address" },
      { "indexed": true, "internalType": "address", "name": "operator", "type": "address" },
      { "indexed": false, "internalType": "bool", "name": "approved", "type": "bool" }
    ],
    "name": "ApprovalForAll",
    "type": "event"
  }
]