thumb|270px|A two-seat open top Fantom. Fantom is a Swedish velomobile with four wheels, two in the front and two in the rear. It has no front suspension, but has suspension in the rear. Fantom was
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 0xe7a9adfb8c41e87fd70453c3e72f6340f0de2d812e8fd7c8cf319a2d8ff93d31. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6a75c8e-3198-4948-ab76-e05bb3e113b2.json and https://artists.proofprofile.net/proofs/artist/f6a75c8e-3198-4948-ab76-e05bb3e113b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).