thumb|right|Africa Proconsularis (125 AD)Sinna was a Roman era civitas of the Roman province of Africa Proconsularis. This ancient city is tentatively identified with ruins at Calaat-Es-Senan in mode
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae98aa3a8c6c1144f4ed5633926b7157f13caca26a9dbbf5f25f42d12fa886d. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/304895dd-2312-47b7-8114-aa105403480a.json and https://artists.proofprofile.net/proofs/artist/304895dd-2312-47b7-8114-aa105403480a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).