thumb|right|250px|1921 road map of Houston showing oval race track in approximate location of northern terminus of Buffalo Speedway.Buffalo Speedway is a street in Houston, Texas. It starts in the upp
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 0xa27fa59350e7615bfb0e41bd94f00d2b7cb994fdaa785975799ba719fc506eef. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9f402ef-8bc4-4bf6-a546-65a2837562b4.json and https://artists.proofprofile.net/proofs/artist/d9f402ef-8bc4-4bf6-a546-65a2837562b4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.