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 0x42d94ad96768092d5fb0e9e3db72de2916e2ca3513be9435a2adda383a8b26cc. 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/c4a218e5-4b42-4777-ac7d-c09ffce04f63.json and https://artists.proofprofile.net/proofs/artist/c4a218e5-4b42-4777-ac7d-c09ffce04f63.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Le chant de l'eau - Un compositeur dialogue avec la création, Vol.2