Volker Jacobsen
type: MusicGroup
genre: chamber music
popularity: 2
followers: 13
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSRecordURL
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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
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35156218d3a5a703eef0664dae7821999be221289ef701a4ef0ca72d49926db3. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e64c1a0-57d8-4708-a109-c684551c5786.json and https://artists.proofprofile.net/proofs/artist/3e64c1a0-57d8-4708-a109-c684551c5786.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T02:57:22Z
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album: Mozart, Brahms & Reger: Klarinettenquintette (Quintet for Clarinet in B Minor, Op. 115 - Quintet for Clarinet in A Major, Op. 146 - Quintet for Clarinet in A Major, KV 581)
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  date published: 2015-10-16
track: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: I. Allegro
track: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: IV. Allegretto con variazioni
track: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: II. Larghetto

Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: I. Allegro
type: MusicRecording
duration: PT9M2S
duration ms: 542480
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Sharon Kam
by artist: Isabelle van Keulen
by artist: Ulrike-Anima Mathe
by artist: Volker Jacobsen
by artist: Gustav Rivinius
in album: Mozart: Clarinet Concerto, K. 622 & Clarinet Quintet, K. 581
  type: MusicAlbum
  date published: 2011-09-16
popularity: 2
genre: classical
genre: classical-era
isrc code: DES380020201
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSVerificationAPI
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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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffd07457e845b7233c3076213e5bc961248d47dac20fd50d6c9a5ac77baff8e. 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/DES380020201.
  date published: 2026-07-08T03:20:19Z
audio: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: I. Allegro
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  additional property: Tempo (BPM)
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    type: PropertyValue
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  additional property: Valence (Positivity)
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    type: PropertyValue
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  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
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Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: IV. Allegretto con variazioni
type: MusicRecording
duration: PT9M15S
duration ms: 555666
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Sharon Kam
by artist: Isabelle van Keulen
by artist: Ulrike-Anima Mathe
by artist: Volker Jacobsen
by artist: Gustav Rivinius
in album: Mozart: Clarinet Concerto, K. 622 & Clarinet Quintet, K. 581
  type: MusicAlbum
  date published: 2011-09-16
popularity: 1
genre: classical
genre: classical-era
isrc code: DES380020204
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
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  value: true
additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b598d6f4371c31f42b36dd4b4b71c6133206388c89d69774b2ba638f75df468. 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/DES380020204.
  date published: 2026-07-08T03:20:19Z
audio: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: IV. Allegretto con variazioni
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 143.414
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  additional property: Danceability
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  additional property: Energy
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    value: 0.036
  additional property: Speechiness
    type: PropertyValue
    value: 0.046
  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.336
  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
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  additional property: Mode Name
    type: PropertyValue
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Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: II. Larghetto
type: MusicRecording
duration: PT5M53S
duration ms: 353986
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Sharon Kam
by artist: Isabelle van Keulen
by artist: Ulrike-Anima Mathe
by artist: Volker Jacobsen
by artist: Gustav Rivinius
in album: Mozart: Clarinet Concerto, K. 622 & Clarinet Quintet, K. 581
  type: MusicAlbum
  date published: 2011-09-16
popularity: 1
genre: classical
genre: classical-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93d09bdb4be88d46492193d18d85e22e9cf512a9e16311f873a678e02dc6375. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DES380020202.
  date published: 2026-07-31T15:59:18Z
audio: Quintet for Clarinet, Two Violins, Viola and Violoncello in A Major, K. 581: II. Larghetto
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  additional property: Tempo (BPM)
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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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  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: Key Name
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isrc code: DES380020202
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380020202
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960427
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T15:59:18+00:00
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