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 0xb616320e9306800d9e7c801bffffd788156e2ec898e61d5df527b4a93e414b51. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f6a2d00-a82c-4b4f-ad73-575f20327ca4.json and https://artists.proofprofile.net/proofs/artist/2f6a2d00-a82c-4b4f-ad73-575f20327ca4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Opera Arias (Tenor): Shtoda, Daniil - Rimsky-Korsakov, N.A. / Tchaikovksy, P.I. / Dargomyzhsky, A.S. / Rachmaninov, S. / Khrennikov, T.N.