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 0x3064487c1b6804f7e48cfc9ceee4e757f9fef59ff1b1bedd01bf08882c616ba8. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aff83774-4790-40ab-8743-80a1767a9fcc.json and https://artists.proofprofile.net/proofs/artist/aff83774-4790-40ab-8743-80a1767a9fcc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Violin Sonata No. 9, Op. 47 "Kreutzer" - Pärt: Fratres - Shostakovich: Preludes