thumb|Mathieu Ahlersmeyer (left) in the title role of Dantons Tod at the Hamburgische Staatsoper (1948) Mathieu Karl Maria Ahlersmeyer (29 June 1896 – 23 July 1979) was a German operatic baritone and
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 0xb90be2dadd7da345aff2f547b8920beda2302f432b0a1f1fd60e84f9a91cb122. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11802f71-8f41-408d-948a-13c6a44116d0.json and https://artists.proofprofile.net/proofs/artist/11802f71-8f41-408d-948a-13c6a44116d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lebendige Vergangenheit - Mathieu Ahlersmeyer