Liverpool is a port city and metropolitan borough in Merseyside, England. It is situated on the eastern side of the Mersey Estuary, near the Irish Sea, north-west of London. It had a population of i
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 0xb3bc222cddb0daf90fb9d9dd8ef138d10e91a0e2922fad32576149e0ea3cc066. 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/64735b2b-567c-436e-9778-6c1b10540219.json and https://artists.proofprofile.net/proofs/artist/64735b2b-567c-436e-9778-6c1b10540219.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.