thumb|Louis Persinger's portrait (before 1928) Louis Persinger (11 February 1887, Rochester, Illinois31 December 1966, New York, New York) was an American violinist, pianist and professor of violin.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597e399f8da7c0b225b7651a46e36f8d6b0badfe8dbf64c39fbf6147cff324f9. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35c8c907-83a9-4839-a797-2ddc8492ff90.json and https://artists.proofprofile.net/proofs/artist/35c8c907-83a9-4839-a797-2ddc8492ff90.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).