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 0x82fa6b521d073063825cc1302b03d765050e2a4b22a3af0758c8d5786e9cc326. 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/fdf07704-436e-4ee7-86f7-89e1d2ad9897.json and https://artists.proofprofile.net/proofs/artist/fdf07704-436e-4ee7-86f7-89e1d2ad9897.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schaffrath, C.: Harpsichord Sonatas, Op. 2, Nos. 1-6