thumb|upright=1.2|Crankshaft (red), pistons (gray), cylinders (blue) and flywheel (black) A crankshaft is a mechanical component used in a piston engine to convert the reciprocating motion into rotat
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 0xdf73e53e85992cf615caa2f8ef6924a78e643c12fd8a5d7d7213bda5235a7ca7. 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/4e8ad65b-fa91-4a89-aa82-698e8e39b1d3.json and https://artists.proofprofile.net/proofs/artist/4e8ad65b-fa91-4a89-aa82-698e8e39b1d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).