Walter Kempowski (; 29 April 1929 – 5 October 2007"German author Walter Kempowski dies". 5 October 2007. EARTHtimes.org. Last accessed 5 October 2007.) was a German writer. Kempowski was known for his
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 0x48df7ee8cc61406adc3d7e4eb023327d6833d2821eafca2d8ec4481cab887265. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58eb3e86-ef48-4902-ba94-e9d16478244a.json and https://artists.proofprofile.net/proofs/artist/58eb3e86-ef48-4902-ba94-e9d16478244a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Herren Hagedorn, Jonas und Böckelmann (Geschichten aus der Schulzeit. Weilheimer Literaturlesung. Live-Lesung des Autors. Auszüge aus den Werken "Schöne Aussicht" und "Unser Herr Böckelmann")