Jan Cina (born 20 March 1988) is a Czech actor and singer of Romani descent. He has an acclaimed career as a dancer, actor and vocalist in the Czech Republic. Biography Cina, a Prague native, was b
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 0x96bead430b4569e8831482a867fb49934a3082e80e50fbeda18b26e87d61c374. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/98484148-eb19-4948-84f9-a647ea1e7216.json and https://artists.proofprofile.net/proofs/artist/98484148-eb19-4948-84f9-a647ea1e7216.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).