thumb|Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle. thumb|William Coolidge explains medical imaging and X-rays. An X-ray is a for
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 0x555e937a4d1f5e47ddfaef3bfed1d89dcd1c94ef72dc8f8896efbb9acb284c54. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb48d506-5f99-43a8-a301-8154c455146e.json and https://artists.proofprofile.net/proofs/artist/bb48d506-5f99-43a8-a301-8154c455146e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).