Klaus Bringmann (28 May 1936 – 14 July 2021Uwe Walter, Sinn fürs Wesentliche – Zum Tod von Klaus Bringmann, In: Frankfurter Allgemeine Zeitung vom 19. Juli 2021) was a German historian, an author of
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 0xac4fe1e26500e850fbb9d8122369cca5bb057076e9fa5a8825997f1991fe0e14. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f36de065-fa7d-4d84-bc49-e3da77fe1e1e.json and https://artists.proofprofile.net/proofs/artist/f36de065-fa7d-4d84-bc49-e3da77fe1e1e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).