Paul Lehmann (13 July 1884 – 4 January 1964) was a German paleographer and philologist.Memoir by Harry Caplan, Taylor Starck, and B. L. Ullman in Speculum Vol. 40, No. 3, Jul. 1965, p. 583 Biography
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 0xabccba283917ee77eee1482eaa0ca44080ff29ea7a9691d2ffd663876c156730. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc40f1aa-509c-4960-b2e3-445eeae80d3d.json and https://artists.proofprofile.net/proofs/artist/cc40f1aa-509c-4960-b2e3-445eeae80d3d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.