János Fehérvári
type: MusicGroup
genre: chamber music
genre: classical
popularity: 33
followers: 110
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/fa4d7614-3ef5-4f90-a04e-33ef8f9dfa30.ots
additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/fa4d7614-3ef5-4f90-a04e-33ef8f9dfa30.json
additional property: OTSVerificationAPI
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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 0x73ada0fe2eeda6fd370ef4d3454e48e5b61308bcd7820435e7aa4b387e66457e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa4d7614-3ef5-4f90-a04e-33ef8f9dfa30.json and https://artists.proofprofile.net/proofs/artist/fa4d7614-3ef5-4f90-a04e-33ef8f9dfa30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
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album: Mozart: String Quintets, K. 593 & K. 614
  type: MusicAlbum
  date published: 1998-04-15
album: Mozart: Clarinet Quintet, K. 581 / String Quintet, K. 515
  type: MusicAlbum
  date published: 1996-01-31
  track: Clarinet Quintet in A Major, K. 581: I. Allegro
    type: MusicRecording
    duration: PT9M13S
    duration ms: 553160
    explicit: false
    by artist: Wolfgang Amadeus Mozart
    by artist: József Balogh
    by artist: Danubius Quartet
    in album: Mozart: Clarinet Quintet, K. 581 / String Quintet, K. 515
      type: MusicAlbum
      date published: 1996-01-31
    popularity: 1
    genre: classical
    genre: classical-era
    genre: classical-piano
    genre: opera
    genre: chamber-music
    genre: concerto
    isrc code: HKI199505701
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    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199505701
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-08T03:22:41Z
    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
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556702d87912e4547f570361f5506ecdef5ddbf2a259906fa3fb91b0b6d2edf0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI199505701.
      date published: 2026-07-08T03:22:41Z
    audio: Clarinet Quintet in A Major, K. 581: I. Allegro
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      additional property: Tempo (BPM)
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        value: 133.298
      additional property: Musical Key
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        value: 9
      additional property: Mode (Major/Minor)
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        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.248
      additional property: Energy
        type: PropertyValue
        value: 0.071
      additional property: Speechiness
        type: PropertyValue
        value: 0.044
      additional property: Acousticness
        type: PropertyValue
        value: 0.988
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.354
      additional property: Liveness
        type: PropertyValue
        value: 0.136
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.171
      additional property: Loudness (dB)
        type: PropertyValue
        value: -24.51
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: Clarinet Quintet in A Major, K. 581: II. Larghetto
    type: MusicRecording
    duration: PT5M55S
    duration ms: 355506
    explicit: false
    by artist: Wolfgang Amadeus Mozart
    by artist: József Balogh
    by artist: Danubius Quartet
    in album: Mozart: Clarinet Quintet, K. 581 / String Quintet, K. 515
      type: MusicAlbum
      date published: 1996-01-31
    popularity: 0
    genre: classical
    genre: classical-era
    genre: classical-piano
    genre: opera
    genre: chamber-music
    genre: concerto
    isrc code: HKI199505702
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
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    additional property: CopyrightChainExplorerURL
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    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199505702
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T22:27:44Z
    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 0xd0a564f083948b6d612d75b38d9982d759054f271443d6020620d66452b35b72. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HKI199505702.
      date published: 2026-07-31T22:27:44Z
    audio: Clarinet Quintet in A Major, K. 581: II. Larghetto
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 106.275
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.106
      additional property: Energy
      additional property: Speechiness
      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
album: Mozart: String Quintets, K. 174 and K. 515

Energy
type: PropertyValue
value: 0.008

Speechiness
type: PropertyValue
value: 0.046

Acousticness
type: PropertyValue
value: 0.988

Instrumentalness
type: PropertyValue
value: 0.451

Liveness
type: PropertyValue
value: 0.076

Valence (Positivity)
type: PropertyValue
value: 0.088

Loudness (dB)
type: PropertyValue
value: -32.358

Key Name
type: PropertyValue
value: D

Mode Name
type: PropertyValue
value: Major

Mozart: String Quintets, K. 174 and K. 515
type: MusicAlbum
date published: 1994-10-07