Matthew Rorison Caws (born August 5, 1967) is an American singer, songwriter and guitarist. He is best known as the lead vocalist and guitarist of the alternative rock band Nada Surf. Caws is also a m
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350905967e6cb8a144c9ec730e1db481127262a660fef5432331147a9621663c. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d86e3a6-1c0d-4ab8-bd19-36e28d8fc0f8.json and https://artists.proofprofile.net/proofs/artist/6d86e3a6-1c0d-4ab8-bd19-36e28d8fc0f8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).