ERC-8180 Blob Authenticated Messaging

DraftERCcreated 2026-02-21requires EIP-4844, ERC-8179

Interfaces for authenticated messaging over EIP-4844 blobs with on-chain decoder discovery

Authors: Vitalik Buterin (@vbuterin), Skeletor Spaceman (@skeletor-spaceman), Orca (@0xrcinus)

ERC-165 interface ids

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

`0xe5c5e9a3`	`decode(bytes)`	view
`0x93790f44`	`getKey(address)`	view
`0x7ffb5473`	`isExposed(bytes32)`	view
`0xc3c5a547`	`isRegistered(address)`	view
`0x23fc48c1`	`pubKeySize()`	pure
`0xa3747fef`	`register(bytes,bytes)`
`0xe5aa85f6`	`registerBlobBatch(uint256,uint16,uint16,bytes32,address,address)`
`0x6e71d134`	`registerBlobBatches((uint256,uint16,uint16,bytes32,address,address)[])`
`0x23bfc67d`	`registerCalldataBatch(bytes,bytes32,address,address)`
`0x42df20fb`	`schemeId()`	pure
`0xc45ff281`	`schemeName()`	pure
`0xcf114219`	`signatureSize()`	pure
`0xda5f7811`	`supportsAggregation()`	pure
`0x024ad318`	`verify(bytes,bytes32,bytes)`	view
`0x28240000`	`verifyAggregated(bytes[],bytes32[],bytes)`	view
`0xa1f0f8de`	`verifyWithRegisteredKey(address,bytes32,bytes)`	view

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

`0xb011cd0dd5f186ad3e7efb4ef0a2e3e8c2a287b63b9194fd2561af53e8c2d311`	`BlobBatchRegistered(bytes32,address,bytes32,address,address)`
`0x049c31b7257d27e836c90d48c420819fe4c7bd660c98e78f156b88008dd2241f`	`CalldataBatchRegistered(bytes32,address,bytes32,address,address)`
`0x523bf083cfe237e559164ffb7d2ebfb798c210ca27f5dcc1e92eead723840a20`	`KeyRegistered(address,bytes,uint256)`
`0x9f1815b1c78dece9ae83aeda17613e37cc5f4103f28eb077414865adfdecd141`	`MessageExposed(bytes32,bytes32,address,address,uint64)`