thumb|Jean-Philippe RameauLa guirlande (full name: La guirlande, ou Les fleurs enchantées) is an opera by the French composer Jean-Philippe Rameau with a libretto by Jean-François Marmontel. It takes
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 0xdaa5f73ff1e5ad24bf1e4cbdb488ddae7191ae3f88317ae03e8d37b596cb1725. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b42bb284-6cad-4687-8be7-2dfb2d159888.json and https://artists.proofprofile.net/proofs/artist/b42bb284-6cad-4687-8be7-2dfb2d159888.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).