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 0x6a83aadf60416ae6c0f42d19bf5b4e6e5ed8376474e0fee5227c05425a8784eb. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8025004a-15b6-4044-a692-6441005ac79b.json and https://artists.proofprofile.net/proofs/artist/8025004a-15b6-4044-a692-6441005ac79b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Reinecke, C.: Flute Sonata, "Undine" / Rietz, J.: Flute Sonata in G Minor / Molique, W.B.: Introduction, Andante and Polonaise