thumb|350px|A 17th-century map of France (1687), by Alain Manesson-Mallet, shows the Septentrion atop of the chart, indicating the northern region of the country; the other regions indicated are the O
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 0xa30a8bf25c4f6a6676542bae414950ec40b2e7967377d572348b52b8f944bd3c. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32960c1d-d767-4d5e-a889-405b08178309.json and https://artists.proofprofile.net/proofs/artist/32960c1d-d767-4d5e-a889-405b08178309.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).