thumb|left Franco Pinna (1925–1978) was an Italian photographer of the second half of the 20th century and one of the main representatives of neorealism. He developed his work in black and white. Br
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 0x9f6795afca0ecd2cd1bb1d25976790dd93b2198bf9633e669d8e508246db56ed. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d006d42b-bc86-4bab-b29c-78e99d505034.json and https://artists.proofprofile.net/proofs/artist/d006d42b-bc86-4bab-b29c-78e99d505034.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).