thumb|230px|left|Coat of arms of the old Castilian noble family de Zayas. thumb|Alfredo Zayas y Alfonso, the 4th President of Cuba Zayas is an old Castilian noble family, that has its ancestral seat
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 0xead4567c50dd2efebff36545914df4814bf413ffb34182c1559c1272ab94b7ff. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fad030fb-4f6f-41b9-8be1-75d664fdf8ab.json and https://artists.proofprofile.net/proofs/artist/fad030fb-4f6f-41b9-8be1-75d664fdf8ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).