ERC-6538 Stealth Meta-Address Registry

FinalERCcreated 2023-01-24requires EIP-712, ERC-1271, ERC-5564

A canonical contract for entities to register stealth meta-addresses directly or through a third party using signatures.

Authors: Matt Solomon (@mds1), Toni Wahrstätter (@nerolation), Ben DiFrancesco (@apbendi), Vitalik Buterin (@vbuterin), Gary Ghayrat (@garyghayrat)

ERC-165 interface ids

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

IERC1271	`0x1626ba7e`
IERC6538Registry	`0x7b1f57cb`

`0x3644e515`	`DOMAIN_SEPARATOR()`	view
`0xfe04b106`	`ERC6538REGISTRY_ENTRY_TYPE_HASH()`	view
`0x627cdcb9`	`incrementNonce()`
`0x1626ba7e`	`isValidSignature(bytes32,bytes)`	view
`0xed2a2d64`	`nonceOf(address)`	view
`0x042c7aa3`	`registerKeys(uint256,bytes)`
`0x428d3d0b`	`registerKeysOnBehalf(address,uint256,bytes,bytes)`
`0x7aa8b5ad`	`stealthMetaAddressOf(address,uint256)`	view

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

`0x4e739a47dfa4fd3cfa92f8fe760cebe125565927e5c422cb28e7aa388a067af9`	`StealthMetaAddressSet(address,uint256,bytes)`
`0xa82a649bbd060c9099cd7b7326e2b0dc9e9af0836480e0f849dc9eaa79710b3b`	`NonceIncremented(address,uint256)`

0xc5c2e661 ERC6538Registry__InvalidSignature()

Proposals this one names in its requires field.