thumb|alt=Book cover showing title, and author "Victor Appleton". The title is surmounted by a drawing of a boy in a curly brimmed hat. Around the title are pictures of a plane, a car, a boat and a mo
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 0xe887c0e2916dec144daad5d902ef605a376c8556b705070a78664e02cb298625. 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/81ade135-c30c-49fa-bc5e-e8a99d49c4d5.json and https://artists.proofprofile.net/proofs/artist/81ade135-c30c-49fa-bc5e-e8a99d49c4d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).