Leamouth is a locality in the Blackwall area of Poplar, in the London Borough of Tower Hamlets. The area takes its name from the former Leamouth Wharf and lies on the west side of the confluence of th
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 0x1a8c97abc32b090e8323af4bc0b514b3ca4091df3412bed36bef031141e70108. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/001d6349-9a3c-4371-94ee-7907cdeabd1d.json and https://artists.proofprofile.net/proofs/artist/001d6349-9a3c-4371-94ee-7907cdeabd1d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.