Robert Heppener
type: MusicGroup
description: Robert Heppener (9 August 1925 in Amsterdam – 25 August 2009 in Bergen), also known as Bob Heppener, was a Dutch composer. He was among the most important Dutch composers of the 20th century. Early l
popularity: 2
followers: 86
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additional property: OTSVerifyInstructions
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19efca9bf818e137ae6b37c2b0360440a6a926a92bc8448418cdbc07f3344cab. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90c1f53d-98b4-4af0-84e6-74f0cba3740a.json and https://artists.proofprofile.net/proofs/artist/90c1f53d-98b4-4af0-84e6-74f0cba3740a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
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album: Tussen Bomen / Spinsel / Four Songs on poems by Ezra Pound
  type: MusicAlbum
  date published: 1995-01-01
album: Trail / Memento / Boog
  type: MusicAlbum
  date published: 1997-01-01
album: Robert Heppener: Canti Carnascialeschi, Del Iubilo Del Core Che Esce in Voce, Nachklänge & Bruchstücke Eines Alten Textes
  type: MusicAlbum
  date published: 2005-06-21
track: Im Gestein: I. Flügelnacht I
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  duration: PT5M7S
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  by artist: Robert Heppener
  by artist: Cappella Amsterdam
  by artist: Ensemble Musikfabrik
  by artist: Daniel Reuss
  in album: Ligeti: Lux aeterna / Heppener: Im Gestein
    type: MusicAlbum
    date published: 2007
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  additional property: OTSTimestamp
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    value: 2026-07-08T03:20:19Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399b959ad1f873fd0eed128aafeb57f8ff231cc77614e0456ff8808d2a74942a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140715080.
    date published: 2026-07-08T03:20:19Z
  audio: Im Gestein: I. Flügelnacht I
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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      value: 0.048
    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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      value: -40.002
    additional property: Key Name
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      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Im Gestein: II. Die Halde
  type: MusicRecording
  duration: PT2M26S
  duration ms: 146800
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  by artist: Robert Heppener
  by artist: Cappella Amsterdam
  by artist: Ensemble Musikfabrik
  by artist: Daniel Reuss
  in album: Ligeti: Lux aeterna / Heppener: Im Gestein
    type: MusicAlbum
    date published: 2007
  isrc code: FRZ140715090
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  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x12594393f4604dc0377ea3901937af6a7eb484c2e4209453900ded82fddffa10. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140715090.
    date published: 2026-07-31T13:04:34Z
  audio: Im Gestein: II. Die Halde
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
      type: PropertyValue
      value: 0.185
    additional property: Energy
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    additional property: Speechiness
      type: PropertyValue
      value: 0.046
    additional property: Acousticness
    additional property: Instrumentalness
    additional property: Liveness
    additional property: Valence (Positivity)
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name

Acousticness
type: PropertyValue
value: 0.983

Instrumentalness
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value: 0.169

Liveness
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value: 0.146

Valence (Positivity)
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value: 0.036

Loudness (dB)
type: PropertyValue
value: -27.327

Key Name
type: PropertyValue
value: E

Mode Name
type: PropertyValue
value: Minor