Hendrik Franciscus Andriessen (17 September 1892 – 12 April 1981) was a Dutch composer and organist. He is remembered most of all for his improvisation at the organ and for the renewal of Catholic lit
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 0x078ff1c2a363e726505042c0195878e6e42a370a788509b84e3ce674563421ef. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/194eac89-d8f1-4ac2-a4c4-7253f1db0e85.json and https://artists.proofprofile.net/proofs/artist/194eac89-d8f1-4ac2-a4c4-7253f1db0e85.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hendrik Andriessen, Orchestral Works by the Netherlands Radio Philharmonic
Hendrik Andriessen: Symphonic Works, Vol. 1
Andriessen: The Four Chorals and Other Organ Music
Hendrik Andriessen: Symphonic Works, Vol. 3
Andriessen: Sonnet - Missa sponza Christi - Omagio a Marenzio - Missa in festo assumptionis Beatae Mariae Virginis
Variations and Fugue on a Theme by Johann Kuhnau / Miroir de peine
Andriessen: Miroir de Peine, Orchestral Music & Concertos