thumb|A Nigerian man receives the smallpox vaccine in February 1969, as part of a global program that successfully eradicated the disease from the human population. Success is the state or condition o
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 0x20602ad55f32dfb4c46c90e6a24fabfbc98968cce6094e3f0ccc661aee67f44c. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7351d04-288a-4468-a5d8-3c0b79029da7.json and https://artists.proofprofile.net/proofs/artist/f7351d04-288a-4468-a5d8-3c0b79029da7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).