Ton de Leeuw
type: MusicGroup
genre: avant-garde
description: thumb|Image of Ton de Leeuw Antonius Wilhelmus Adrianus de Leeuw (Rotterdam, 16 November 1926 - Paris, 31 May 1996) was a Dutch composer. He occasionally experimented with microtonality. Life and car
popularity: 2
followers: 191
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf9b8dd1f7208d2c9611bb7b087e89e7590629e1d0e424c6bcd12978e13fc051e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953915
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953915
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/198009dd-e1b6-4e63-9f66-2594cde90098.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/198009dd-e1b6-4e63-9f66-2594cde90098.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/198009dd-e1b6-4e63-9f66-2594cde90098
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T08:36:32Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf9b8dd1f7208d2c9611bb7b087e89e7590629e1d0e424c6bcd12978e13fc051e","name":"Ton de Leeuw","registered_at":"2026-06-15T22:29:40Z","symbol":"NIM0851800","token_address":"0xfc84982ed642ccb69b6f50e20a73f6f3f7b1829b","type":"artist","uuid":"198009dd-e1b6-4e63-9f66-2594cde90098"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b8dd1f7208d2c9611bb7b087e89e7590629e1d0e424c6bcd12978e13fc051e. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/198009dd-e1b6-4e63-9f66-2594cde90098.json and https://artists.proofprofile.net/proofs/artist/198009dd-e1b6-4e63-9f66-2594cde90098.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T08:36:32Z
  text: {"copyright_id":"0xf9b8dd1f7208d2c9611bb7b087e89e7590629e1d0e424c6bcd12978e13fc051e","name":"Ton de Leeuw","registered_at":"2026-06-15T22:29:40Z","symbol":"NIM0851800","token_address":"0xfc84982ed642ccb69b6f50e20a73f6f3f7b1829b","type":"artist","uuid":"198009dd-e1b6-4e63-9f66-2594cde90098"}
album: Antigone
  type: MusicAlbum
  date published: 1993-07-01
album: Symphonies of Winds / Haiku II / Résonances
  type: MusicAlbum
  date published: 1993-07-01
album: Choral Works
  type: MusicAlbum
  date published: 2004-08-11
album: Ton De Leeuw: Chamber Music
  type: MusicAlbum
  date published: 2005-06-21
album: De Leeuw: Complete Piano Solo Works
  type: MusicAlbum
  date published: 2009-09-01
album: Leeuw: Complete Piano Solo Works
  type: MusicAlbum
  date published: 2012-02-07
album: Cinq hymnes: No. 5, La source de toute musique
  type: MusicAlbum
  date published: 2025-09-12
album: Ton de Leeuw: Cinq hymnes
  type: MusicAlbum
  date published: 2025-09-26