ERC-5521 Referable NFT

FinalERCcreated 2022-08-101 later proposal build on itrequires ERC-165, ERC-721

An ERC-721 extension to construct reference relationships among NFTs

Authors: Saber Yu (@OniReimu), Qin Wang, Shange Fu, Yilin Sai, Shiping Chen, Sherry Xu, Jiangshan Yu

ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IERC_5521 0x75cbe2f2

`0xd30d968d`	`createdTimestampOf(address,uint256)`	view
`0x64f9b0e6`	`referredOf(address,uint256)`	view
`0xa35391ac`	`referringOf(address,uint256)`	view
`0x616c5535`	`setNode(uint256,address[],uint256[][])`
`0x01ffc9a7`	`supportsInterface(bytes4)`	view

Interfaces the spec defines alongside the core one, which an implementation may or may not carry.

`0x55c10440`	`setNodeReferredExternal(address,uint256,uint256[])`
`0xa35391ac`	`referringOf(address,uint256)`
`0x64f9b0e6`	`referredOf(address,uint256)`
`0xd30d968d`	`createdTimestampOf(address,uint256)`
`0x01ffc9a7`	`supportsInterface(bytes4)`

Topic0 is the keccak256 hash of the signature, which is what a log filter matches on.

0x81bed52c04e8cd65796985202162bad7e20a8ffaa732fe2e0a0bc79f687e4d66 UpdateNode(uint256,address,address[],uint256[][],address[],uint256[][])

Proposals this one names in its requires field.

Later proposals that name this one in their requires field.