thumb|right|upright=1.3|French royalist rebels preparing an ambush during the War in the Vendée (The Ambush by Évariste Carpentier, 1889) thumb|General Braddock's troops ambushed and decimated by the
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 0xd173727a6e18e8f4d2dbf58bec6e2d1ae1b97711f5518f26ff0ea095a4f4e79e. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0df767f-d711-4c03-b896-c6d530433046.json and https://artists.proofprofile.net/proofs/artist/a0df767f-d711-4c03-b896-c6d530433046.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).