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 0x3ba8459870eb2855d46d169a9dc08de44146fd4758c94a8a41f37decbc8a5776. 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/b4972228-7a49-4402-8d5e-613d66bacfee.json and https://artists.proofprofile.net/proofs/artist/b4972228-7a49-4402-8d5e-613d66bacfee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Handel: Organ Concerto Op. 4 No. 4 - Haydn: Organ Concerto No. 1
From Frescobaldi to Brahms - A Homage to Giorgio Questa