Rolf Schimpf (14 November 1924 – 22 March 2025) was a German actor, most famous for his portrayal of Leo Kress in the ZDF crime drama television series The Old Fox from 1986 to 2007, with guest appear
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 0xdd083f38b62f53479cbf291061bd478eb91e35194d6423c4af17042f186a96c4. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef2378aa-069e-4661-b0b8-6f3de54c7f6d.json and https://artists.proofprofile.net/proofs/artist/ef2378aa-069e-4661-b0b8-6f3de54c7f6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).