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 0x85fdcf1e2f5c2297fd5ee7cbeab0ab2ef6b18881e548d981fa869b50dac2d6ea. 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/0e1bafa2-5a0e-4e88-97bb-b0ad4167ca79.json and https://artists.proofprofile.net/proofs/artist/0e1bafa2-5a0e-4e88-97bb-b0ad4167ca79.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frank Martin: Der Cornet: Die Weise von Liebe und Tod des Cornets Christoph Rilke