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 0x5016e5c1bc5ab0c55d2a792d4fc2907c0619da33b87d96cbeb0e61d04621d812. 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/1811f542-2906-4b6f-a447-5999c01457ee.json and https://artists.proofprofile.net/proofs/artist/1811f542-2906-4b6f-a447-5999c01457ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Korngold: Violin Concerto in D Major, Op. 35 (Live)