thumb|right|Passengers on a boat in the Danube Delta, 2008 thumb|right|Passengers in the lounge car of an Amtrak San Joaquin train thumb|Passenger on a bicycle A passenger is a person who travels in a
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 0x5cda290ef7e18f2c2248b6066b7d5b4fa8ace0d04242e30b77d49e011dd9722b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4af60349-cff2-4fab-97cf-6c6e60b71881.json and https://artists.proofprofile.net/proofs/artist/4af60349-cff2-4fab-97cf-6c6e60b71881.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).