thumb|right|250px|July 14: Storming of the Bastille takes place in the French Revolution. Events thumb|right|French Revolution: June 20: Tennis Court Oath, drawing by David. January–March Januar
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 0xf4a39c7484aae10c4142b8910c71294d2e7f7cde13a4065a575c36c70c991ba9. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff8af5b4-9cb2-49e5-a9ba-330f02e3111a.json and https://artists.proofprofile.net/proofs/artist/ff8af5b4-9cb2-49e5-a9ba-330f02e3111a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).