thumb|Composer Leonard Bernstein (seated) and his wife, Felicia Montealegre, with Black Panthers Field Marshal Donald L. Cox (right), at a fundraiser for the Black Panthers in January 1970 at the Bern
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 0x4101a6b4b9a6ce3fb106051585301995e8984a5184accbd11292f85cdd0f0aac. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da67f7ec-c6a2-4f47-9cf1-6ff8312f5f6e.json and https://artists.proofprofile.net/proofs/artist/da67f7ec-c6a2-4f47-9cf1-6ff8312f5f6e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).