Petr Kulhánek (born 14 April 1971) is a Czech politician who served as Minister of Regional Development in the Cabinet of Petr Fiala from October 2024 to December 2025. He has served as Governor of Ka
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 0x51c3cdd1d7637e2d0612ec4322d9af3ebcc521dc20b8b91b169e2b221cfa8bbc. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfd60b5a-0d68-4f0b-9a22-96a8f8d10592.json and https://artists.proofprofile.net/proofs/artist/dfd60b5a-0d68-4f0b-9a22-96a8f8d10592.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).