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genre: chamber music
genre: classical
genre: classical piano
description: thumb|Kit Armstrong in 2014 Kit Armstrong (, born March 5, 1992) is an American classical pianist, composer, organist, and former child prodigy of British-Taiwanese parentage. Education Armstrong w
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subject of: OpenTimestamps Proof of Existence
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album: Bach / Ligeti / Armstrong
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  date published: 2013-09-27
album: William Byrd & John Bull: The Visionaries of Piano Music
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track: Prelude "Laet ons met herten reijne" (MB 14/56; BL Add. MS 23623 f. 65)
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  subject of: OpenTimestamps Proof of Existence
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track: Violin Sonata in C Major, K. 296: I. Allegro vivace
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  subject of: OpenTimestamps Proof of Existence
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track: Violin Sonata in C Major, K. 296: II. Andante sostenuto
track: Violin Sonata in C Major, K. 296: III. Rondeau. Allegro
track: Violin Sonata in G Major, K. 301: I. Allegro con spirito
track: Violin Sonata in G Major, K. 301: II. Allegro
track: Violin Sonata in E-Flat Major, K. 302: I. Allegro
track: Violin Sonata in E-Flat Major, K. 302: II. Rondeau. Andante grazioso
track: Violin Sonata in C Major, K. 303: I. Adagio - Molto allegro
track: Violin Sonata in C Major, K. 303: II. Tempo di menuetto
track: Violin Sonata in E Minor, K. 304: I. Allegro
track: Violin Sonata in E Minor, K. 304: II. Tempo di menuetto
track: Violin Sonata in A Major, K. 305: I. Allegro di molto
track: Violin Sonata in A Major, K. 305: IIa. Thema. Andante grazioso
track: Violin Sonata in A Major, K. 305: IIb. Var. 1 (violino tacet)
track: Violin Sonata in A Major, K. 305: IIc. Var. 2
track: Violin Sonata in A Major, K. 305: IId. Var. 3
track: Violin Sonata in A Major, K. 305: IIe. Var. 4
track: Violin Sonata in A Major, K. 305: IIf. Var. 5
track: Violin Sonata in A Major, K. 305: IIg. Var. 6. Allegro

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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-06T06:56:49Z
audio: Violin Sonata in C Major, K. 296: II. Andante sostenuto
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Violin Sonata in C Major, K. 296: III. Rondeau. Allegro
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T13:32:09Z
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subject of: OpenTimestamps Proof of Existence
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
  type: PropertyValue
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88faa34f999891946d06230e6a7ef62955afe40be6fa086b114e49d1285c600e. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/DEN962300952.
  date published: 2026-07-29T13:38:16Z
audio: Violin Sonata in G Major, K. 301: II. Allegro
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Violin Sonata in E-Flat Major, K. 302: I. Allegro
type: MusicRecording
duration: PT5M22S
duration ms: 322653
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300961
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: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300961
additional property: OTSTimestamp
  type: PropertyValue
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ee68b113b7006145e94c5432adb8a1c0f429db2baa0fadd7ae627eb5b1196e. 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/DEN962300961.
  date published: 2026-07-08T03:20:19Z
audio: Violin Sonata in E-Flat Major, K. 302: I. Allegro
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  additional property: Tempo (BPM)
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Violin Sonata in E-Flat Major, K. 302: II. Rondeau. Andante grazioso
type: MusicRecording
duration: PT6M54S
duration ms: 414946
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300962
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: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300962
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 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 0xa7d9cb796b81ca8f719296ab123765dddc922a1f590fa37f686ba6aef036a3e1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN962300962.
  date published: 2026-07-29T19:35:34Z
audio: Violin Sonata in E-Flat Major, K. 302: II. Rondeau. Andante grazioso
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  additional property: Mode Name
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Violin Sonata in C Major, K. 303: I. Adagio - Molto allegro
type: MusicRecording
duration: PT5M21S
duration ms: 321480
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300971
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300971
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T13:21:01Z
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 0x73078e347e688d10451ce51f82f359c0378720cd2c19988a9ed0f4c6681d0491. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEN962300971.
  date published: 2026-07-29T13:21:01Z
audio: Violin Sonata in C Major, K. 303: I. Adagio - Molto allegro
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  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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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: Loudness (dB)
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  additional property: Key Name
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  additional property: Mode Name
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Violin Sonata in C Major, K. 303: II. Tempo di menuetto
type: MusicRecording
duration: PT3M33S
duration ms: 213466
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300972
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: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300972
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T00:16:15Z
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 0x145d8d37b2625fc3f3adb601adf58650ea532fbee9d91c2878f353d4f9172fac. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/DEN962300972.
  date published: 2026-07-30T00:16:15Z
audio: Violin Sonata in C Major, K. 303: II. Tempo di menuetto
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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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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  additional property: Key Name
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  additional property: Mode Name
    type: PropertyValue
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Violin Sonata in E Minor, K. 304: I. Allegro
type: MusicRecording
duration: PT7M9S
duration ms: 429706
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300981
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-29T20:59:46+00:00
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960144
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300981
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T21:09:47Z
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 0xfc98a9b8f1d56689876d1ffbaaf83182fcde11175a28bf06f215b0acb6941e4a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEN962300981.
  date published: 2026-07-29T21:09:47Z
audio: Violin Sonata in E Minor, K. 304: I. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
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  additional property: Musical Key
    type: PropertyValue
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
    value: 0.35
  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
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  additional property: Mode Name
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Violin Sonata in E Minor, K. 304: II. Tempo di menuetto
type: MusicRecording
duration: PT5M42S
duration ms: 342333
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2023-06-23
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: DEN962300982
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: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953520
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962300982
additional property: OTSTimestamp
  type: PropertyValue
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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 0xb6eb0e76c6d2db612e42e236f03ac01d3fa7e4b9e97008ba2c74d667d3e8d3b3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEN962300982.
  date published: 2026-06-13T13:32:09Z
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Violin Sonata in A Major, K. 305: I. Allegro di molto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Violin Sonata in A Major, K. 305: I. Allegro di molto
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Violin Sonata in A Major, K. 305: IIa. Thema. Andante grazioso
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T00:11:40Z
audio: Violin Sonata in A Major, K. 305: IIa. Thema. Andante grazioso
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Violin Sonata in A Major, K. 305: IIb. Var. 1 (violino tacet)
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subject of: OpenTimestamps Proof of Existence
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Violin Sonata in A Major, K. 305: IIc. Var. 2
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subject of: OpenTimestamps Proof of Existence
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Violin Sonata in A Major, K. 305: IId. Var. 3
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subject of: OpenTimestamps Proof of Existence
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Violin Sonata in A Major, K. 305: IIe. Var. 4
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subject of: OpenTimestamps Proof of Existence
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Violin Sonata in A Major, K. 305: IIg. Var. 6. Allegro
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by artist: Wolfgang Amadeus Mozart
by artist: Renaud Capuçon
by artist: Kit Armstrong
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