Günther Karl (born 4 January 1949) is a German rower who represented West Germany. He competed at the 1968 Summer Olympics in Mexico City with the men's coxless pair where they came twelfth. At the 1
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 0x9129cc5462e795207e8991bffc4ba3f600cbda5ea859e37e9eead03527c48a8d. 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/63a4604f-108d-4077-bf77-b9e5c45496bb.json and https://artists.proofprofile.net/proofs/artist/63a4604f-108d-4077-bf77-b9e5c45496bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).