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 0x06915a93d4feab7769695835a04f7cc0c5ace083141c9887c63ad1790d5ccabb. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63f55dc7-84e1-4c40-9ee5-d82d09b50a28.json and https://artists.proofprofile.net/proofs/artist/63f55dc7-84e1-4c40-9ee5-d82d09b50a28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Platti: Oboe Concerto in G Minor: I. Allegro
De la Guerre: Sonata No. 1 in D Minor: VI. Aria
Marcello: Oboe Concerto in D Minor, S. Z799 (After BWV 974): II. Adagio [Arr. By Juri Vallentin]