eip-20 ERC 20

A standard interface for tokens.
A standard interface allows any tokens on Ethereum to be re-used by other applications: from wallets to decentralized exchanges.

• Authors:
• Fabian Vogelsteller
• - Vitalik Buterin

Basic structure

function totalSupply() constant returns (uint256 totalSupply);
function balanceOf(address _owner) constant returns (uint256 balance);
function transfer(address _to, uint256 _value) returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
function approve(address _spender, uint256 _value) returns (bool success);
function allowance(address _owner, address _spender) constant returns (uint256 remaining);

event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);

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eip-721 ERC 721

A standard interface for non-fungible tokens, also known as deeds.
A standard interface allows wallet/broker/auction applications to work with any NFT on Ethereum. We provide for simple ERC-721 smart contracts as well as contracts that track an arbitrarily large number of NFTs. Additional applications are discussed below.
This standard is inspired by the ERC-20 token standard and builds on two years of experience since EIP-20 was created. EIP-20 is insufficient for tracking NFTs because each asset is distinct (non-fungible) whereas each of a quantity of tokens is identical (fungible).
Differences between this standard and EIP-20 are examined below.

• Authors:
• William Entriken
• - Dieter Shirley
• - Jacob Evans
• - Nastassia Sachs

Requires: EIP-165

Basic structure

function balanceOf(address _owner) external view returns (uint256);
function ownerOf(uint256 _tokenId) external view returns (address);
function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external payable;
function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
function approve(address _approved, uint256 _tokenId) external payable;
function setApprovalForAll(address _operator, bool _approved) external;
function getApproved(uint256 _tokenId) external view returns (address);
function isApprovedForAll(address _owner, address _operator) external view returns (bool);

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

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eip-1155 ERC 1155

A standard interface for contracts that manage multiple token types. A single deployed contract may include any combination of fungible tokens, non-fungible tokens or other configurations (e.g. semi-fungible tokens).
Tokens standards like ERC-20 and ERC-721 require a separate contract to be deployed for each token type or collection. This places a lot of redundant bytecode on the Ethereum blockchain and limits certain functionality by the nature of separating each token contract into its own permissioned address. With the rise of blockchain games and platforms like Enjin Coin, game developers may be creating thousands of token types, and a new type of token standard is needed to support them. However, ERC-1155 is not specific to games and many other applications can benefit from this flexibility.
New functionality is possible with this design such as transferring multiple token types at once, saving on transaction costs. Trading (escrow / atomic swaps) of multiple tokens can be built on top of this standard and it removes the need to “approve” individual token contracts separately. It is also easy to describe and mix multiple fungible or non-fungible token types in a single contract.

• Authors:
• Witek Radomski
• - Andrew Cooke
• - Philippe Castonguay
• - James Therien
• - Eric Binet
• - Ronan Sandford

Requires: EIP-165

Basic structure

function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external;
function safeBatchTransferFrom(address _from, address _to, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) external;
function balanceOf(address _owner, uint256 _id) external view returns (uint256);
function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids) external view returns (uint256[] memory);
function setApprovalForAll(address _operator, bool _approved) external;
function isApprovedForAll(address _owner, address _operator) external view returns (bool);

event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _value);
event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _values);
event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
event URI(string _value, uint256 indexed _id);

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