Daan Manneke (born 7 November 1939) is a Dutch composer and organist. Manneke was born in Kruiningen. He studied organ and composition from 1963 to 1967 at the Brabant Conservatory in Tilburg, under
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 0x520df314015f9190cf5ea8bc32030e1f76d796888b850669970b2d3134513551. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73951876-1b91-411d-a66d-79f70385e665.json and https://artists.proofprofile.net/proofs/artist/73951876-1b91-411d-a66d-79f70385e665.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Manneke: Pneoo - Archipel I - Pseaume 121 - Organum - Threni - Et in tempore vesperi erit lux
Daan Manneke: Grote archipel, Polychroon & Blues for Marcel (Live)