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 0x670f72ef7cc907a76fc206a8d1cb564298e85bf50d2ea876f173f3751f515e75. Chain 2 (Bitcoin): anchored in block 953938 (2026-06-16T11:35:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20d37507-53aa-4c0c-9b88-5bf134075a3c.json and https://artists.proofprofile.net/proofs/artist/20d37507-53aa-4c0c-9b88-5bf134075a3c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'Orchestraccia (feat. Marco Conidi, Giorgio Caputo, Edoardo Pesce, Edoardo Leo, Luca Angeletti) [2012]