thumb|right | alt=alt=Refer to caption | Vice Admiral (Patrona) of the Ottoman Empire, around 1800. Patrona was a military rank of the Ottoman Navy equivalent to a Vice admiral or modern Turkish Tüma
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 0x70ca5afb3877db462587dc601f3b450161a5fbc0a9e4bfb10eac37990f8b73ea. 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/faa223d2-e827-44f0-9515-6f8d2d8fc4e1.json and https://artists.proofprofile.net/proofs/artist/faa223d2-e827-44f0-9515-6f8d2d8fc4e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).