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 0xb8e395fdeeaffb4fa9add84c157087e8eb198e2c56c719e8b58e8a0f2669b33d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dabb8981-8816-4213-87bf-231fd48aeb81.json and https://artists.proofprofile.net/proofs/artist/dabb8981-8816-4213-87bf-231fd48aeb81.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Maurice Ravel: La Valse for Piano Solo (A choreographic poem) / La Valse pour piano (un poème chorégraphique) - Grand Piano Masters