Johan Duijck (born 1954 in Ghent) is a Belgian composer and conductor. He is conductor of the Flemish Radio Choir, the Academy of St Martin in the Fields Chorus in London and the Gents Madrigaalkoor.
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 0x37200e63f73fb0e96eac2829001e838b1561d0ee005df512192730acfdbccfce. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebbf1150-05f1-4e47-9baa-b0a6971869b7.json and https://artists.proofprofile.net/proofs/artist/ebbf1150-05f1-4e47-9baa-b0a6971869b7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
In Flanders' Fields Vol. 54: El Camino del Alma
In Flanders' Fields Vol. 58: Johan Duijck - Cantiones Sacrae
In Flanders' Fields Vol. 66: Concierto del Alma
In Flanders' Fields, Vol. 86: Mirando (Choral Works)