270px|thumbnail|right|"David and Jonathan", one of Gustave Doré's illustrations for La Grande Bible de Tours David and Jonathan were, according to the Hebrew Bible's Books of Samuel, heroic figures of
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 0xd8c911554291bc612fecd659e8cd3c4df78cb7a84dc70fa1ff3d03a5d06dad8d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87592c46-1710-4cac-9300-a7eb1c366028.json and https://artists.proofprofile.net/proofs/artist/87592c46-1710-4cac-9300-a7eb1c366028.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).