thumb|right|Egyptian first lady Jehan Sadat receiving American counterpart Rosalynn Carter in Cairo, March 8, 1979 thumb|right|A group of first ladies assemble in the Metropolitan Museum of Art in New
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 0x23b1c4091083d10f27688d83e941d3bedb8e36742aba650ddc28454c4643ded8. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ff2301c-6d2c-4c47-b50d-f54613e78937.json and https://artists.proofprofile.net/proofs/artist/5ff2301c-6d2c-4c47-b50d-f54613e78937.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).