ERC-3525 Semi-Fungible Token

FinalERCcreated 2020-12-012 later proposals build on itrequires ERC-20, ERC-165, ERC-721

Defines a specification where ERC-721 compatible tokens with the same SLOT and different IDs are fungible.

Authors: Will Wang (@will42w), Mike Meng, Yi Cai (@YeeTsai), Ryan Chow, Zhongxin Wu (@Nerverwind), AlvisDu (@AlvisDu)

ERC-165 interface ids

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

IERC3525 0xd5358140

`0xe345e0bc`	`allowance(uint256,address)`	view
`0x8cb0a511`	`approve(uint256,address,uint256)`	payable
`0x9cc7f708`	`balanceOf(uint256)`	view
`0x263f3e7e`	`slotOf(uint256)`	view
`0x0f485c02`	`transferFrom(uint256,address,uint256)`	payable
`0x310ed7f0`	`transferFrom(uint256,uint256,uint256)`	payable
`0x3e7e8669`	`valueDecimals()`	view

`0x095ea7b3`	`approve(address,uint256)`	ERC-721
`0x70a08231`	`balanceOf(address)`	ERC-721
`0x081812fc`	`getApproved(uint256)`	ERC-721
`0xe985e9c5`	`isApprovedForAll(address,address)`	ERC-721
`0x6352211e`	`ownerOf(uint256)`	ERC-721
`0xb88d4fde`	`safeTransferFrom(address,address,uint256,bytes)`	ERC-721
`0x42842e0e`	`safeTransferFrom(address,address,uint256)`	ERC-721
`0xa22cb465`	`setApprovalForAll(address,bool)`	ERC-721
`0x01ffc9a7`	`supportsInterface(bytes4)`	ERC-165
`0x23b872dd`	`transferFrom(address,address,uint256)`	ERC-721

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

`0xed08fa80`	`slotCount()`
`0x993bef8d`	`slotByIndex(uint256)`
`0x4f8a0f83`	`tokenSupplyInSlot(uint256)`
`0x00cd0110`	`tokenInSlotByIndex(uint256,uint256)`

`0x55cd4e06`	`setApprovalForSlot(address,uint256,address,bool)`
`0xe345f05e`	`isApprovedForSlot(address,uint256,address)`

`0xe8a3d485`	`contractURI()`
`0x09c3dd87`	`slotURI(uint256)`

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

`0x0b2aac84f3ec956911fd78eae5311062972ff949f38412e8da39069d9f068cc6`	`TransferValue(uint256,uint256,uint256)`
`0x621b050de0ad08b51d19b48b3e6df75348c4de6bdd93e81b252ca62e28265b1b`	`ApprovalValue(uint256,address,uint256)`
`0xe4f48c240d3b994948aa54f3e2f5fca59263dfe1d52b6e4cf39a5d249b5ccb65`	`SlotChanged(uint256,uint256,uint256)`
`0x7bdf71e6625aa496095bf08b60c677cf81c963f402cf258981e3bd7507d3480c`	`ApprovalForSlot(address,uint256,address,bool)`

Proposals this one names in its requires field.

Later proposals that name this one in their requires field.