Martin Písařík (born 1 July 1979 in Prague) is a Czech film, television, stage and voice actor. He studied at the Jaroslav Ježek Conservatory. He performed the character of Oskar Všetečka in the Czech
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 0xc5f400e1ea529a0fa418e565fa5de868e25af545f30f853257de72eb95706b4b. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/145c7442-8a25-477e-9ad7-31e26e502d6c.json and https://artists.proofprofile.net/proofs/artist/145c7442-8a25-477e-9ad7-31e26e502d6c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).