Stefan Heinz Andreas Köhler (born 24 September 1967) is a German politician of the Christian Social Union who was elected member of the European Parliament in 2024. He has served as president of the D
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 0x59c0dc632864a7e160c43a9a2e5c7c20d620645900058a855f98a2db6188e604. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ae05249-3fc7-4c91-abc8-7d617daa5e53.json and https://artists.proofprofile.net/proofs/artist/4ae05249-3fc7-4c91-abc8-7d617daa5e53.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Auf Feindfahrt mit U 139 (Weltkriegsthriller über ein deutsches U-Boot im Einsatz)
Einsatzbericht: Im Fadenkreuz (Spannende U-Boot Romane von EK-2 Publishing)
Auf Feindfahrt Teil II - Wölfe der See: Zweiter Weltkrieg: Marine-Thriller über ein deutsches U-Boot im Einsatz (Auf Feindfahrt - Romanreihe über deutsche U-Boote im Einsatz, Band 2)