Jan Hádek (born 4 September 1945) is a Czech former speedway rider. Speedway career Hádek partnered Jan Holub I to the World Pairs final at the 1974 Speedway World Pairs Championship, which was won
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 0x91263871b187258be1d9a844e01c2857a562fff3b5e11b087dec20d13e221e98. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.json and https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).