thumb|right|200px|An old depiction of Osor and a part of Cres Cres is an Adriatic island in west Croatia. It is one of the northern islands in the Kvarner Gulf and can be reached via ferry from Rijeka
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 0x946a4c41f7196da361145cbc515ab6dab1363a46cd0d819ae5b97b312ac5dbf8. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/137f781b-5591-487d-9ce6-f0c509595e51.json and https://artists.proofprofile.net/proofs/artist/137f781b-5591-487d-9ce6-f0c509595e51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).