Sigmund Werner Paul Jähn (; 13 February 1937 – 21 September 2019) was a German pilot, cosmonaut, and Generalmajor (equivalent to a Brigadier General in Western armies) in the National People's Army 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 0xce8cf16e2f55c71cfc9ddea5d97428c1d01961fc52475df5caa53bc72cf992b9. 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/4be5f792-787c-4681-ae58-431754beb491.json and https://artists.proofprofile.net/proofs/artist/4be5f792-787c-4681-ae58-431754beb491.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).