Petr Linhart (born 29 May 1990) is a Czech handball player. He plays for Fenix Toulouse and the Czech national team. He participated at the 2015 World Men's Handball Championship in Qatar. References
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 0x4e5be4ecf540f398136ba7a5550674122cb49485a4d2c7d759f533683bc40b35. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7370d0e-530d-44ab-8067-3641d1d21ace.json and https://artists.proofprofile.net/proofs/artist/e7370d0e-530d-44ab-8067-3641d1d21ace.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).