thumb|Václav Rabas Václav Rabas (13 November 1885 in Krušovice – 26 October 1954 in Prague) was a Czechoslovak painter.Czechoslovak Life 1988 - the works of some older artists (notably Václav Rabas,
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 0x1e9e412c6d3fe5e41deb18eae80332ed112853d55e7f96b1530be1169f6984b2. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00775b66-f9ea-4871-9bef-550fe378bfe2.json and https://artists.proofprofile.net/proofs/artist/00775b66-f9ea-4871-9bef-550fe378bfe2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vejvanovský, Praetorius, Pecelius, Michna: Christmas Brass Music
Vejvanovský, Michna, Otto, Pecelius, Schiassi: Christmas Brass Music
Martinů, Mácha, Dvořáček, Fišer: Organ Works