Common may refer to: As an Irish surname, it is anglicised from Irish Gaelic surname Ó Comáin. Places Common, a townland in County Tyrone, Northern Ireland Boston Common, a central public park in
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 0xb917280ac758c60724a62dda2170bd85a9e35d3e49b1a01f4773ca2e78df8fcb. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6905f2a4-5bbf-42c2-b523-f02d9772e4cb.json and https://artists.proofprofile.net/proofs/artist/6905f2a4-5bbf-42c2-b523-f02d9772e4cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).