thumb|Bay at Castletown, Isle of Man thumb|Bay of Baracoa, Cuba A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another
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 0x479df239675cb57e65104d8f3515abbc7322c44c2761f1a92a46e41a7c08a2e9. 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/d1a62b6d-e1b6-4933-94f1-a3e8ffb3a351.json and https://artists.proofprofile.net/proofs/artist/d1a62b6d-e1b6-4933-94f1-a3e8ffb3a351.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).