ERC-7962 Key Hash Based Tokens

DraftERCcreated 2025-05-16requires ERC-20, EIP-712, ERC-721, ERC-2612, ERC-5564

Extends privacy to ERC-721 and ERC-20 tokens.

Authors: Alex Tian (@dugubuyan), Zhixiong Pan (@nake13), Geoffrey (@stbrahms), liyingxuan (@LiYingxuan)

ERC-165 interface ids

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

IERCKeyHash721	`0xf2a95423`
IERCKeyHash20	`0xf45a8391`

`0x6c7f1542`	`balanceOf(bytes32)`	view
`0x313ce567`	`decimals()`	view
`0x06fdde03`	`name()`	view
`0x6352211e`	`ownerOf(uint256)`	view
`0x95d89b41`	`symbol()`	view
`0xc87b56dd`	`tokenURI(uint256)`	view
`0x18160ddd`	`totalSupply()`	view
`0x222a3b2b`	`transfer(bytes32,bytes32,uint256,bytes,bytes,uint256,bytes32)`
`0xd2b36b7f`	`transfer(uint256,bytes32,bytes,bytes,uint256)`

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

`0x90450a3ea0b69a02dd04cdbb8e70114f7d22ab5eae8f3e3ba430cf323279bb43`	`KeyHashTransfer721(uint256,bytes32,bytes32)`
`0x08997093ea1002d2d9e69f9f8a4a39056b5bf4ca78e0bca8f0e8f7b97f4fd1b4`	`KeyHashTransfer20(bytes32,bytes32,uint256)`

Proposals this one names in its requires field.