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 0x26434f8f43c0449982f3175352893ce6c38813ba1e55f82dfc64ae194e9ed38a. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3324e7f-78a5-4095-a7de-fc4b3bfce3a8.json and https://artists.proofprofile.net/proofs/artist/d3324e7f-78a5-4095-a7de-fc4b3bfce3a8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'encyclopédie sonore: Visages de Lucrèce (Mono version)
Le coup d'état du 2 décembre 1851 (Mono Version)
Hugo: Cosette, extraits des misérables (Mono Version)
L'encyclopédie sonore : douze textes français, vol. 1 (Mono Version)
L'encyclopédie sonore : henri IV (Mono version)
Les pages de Villon qu'il faut connaître: Le testament (Mono Version)
La tragédie du roi Richard II (Mise en scène de jean Vilar, réalisation de Jean Deschamps, au Théâtre National de Paris, 1955)