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album: Bach Muzyk for French Horn
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-06T07:16:32Z
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    date published: 2026-07-08T03:22:41Z
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track: Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
track: Horn Concerto No. 3 in E-flat Major, K. 447: Ii. Romance: Larghetto
track: Horn Concerto No. 1 in D Major, K. 412: I. Allegro
track: Horn Concerto No. 1 in D Major, K. 412: II. Rondo: Allegro
track: Horn Concerto No. 2 in E-Flat Major, K. 417: I. Allegro maestoso
track: Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo: Allegro
track: Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro (cadenza by J. Muzyk)
track: Horn Concerto No. 3 in E-Flat Major, K. 447: II. Romance: Larghetto
track: Horn Concerto No. 3 in E-Flat Major, K. 447: III. Allegro
track: Horn Concerto No. 4 in E-Flat Major, K. 495: I. Allegro maestoso (cadenza by J. Muzyk)
track: Horn Concerto No. 4 in E-Flat Major, K. 495: II. Romance: Andante cantabile
track: Horn Concerto No. 4 in E-Flat Major, K. 495: III. Rondo: Allegro vivace

Horn Concerto No. 1 in D Major, K. 412: I. Allegro
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  date published: 2026-07-02T03:55:08Z
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Horn Concerto No. 1 in D Major, K. 412: II. Rondo: Allegro
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  date published: 2026-07-02T05:09:12Z
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Horn Concerto No. 2 in E-Flat Major, K. 417: I. Allegro maestoso
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  date published: 2026-07-02T03:30:09Z
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Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo: Allegro
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  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
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T05:09:12Z
audio: Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo: Allegro
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Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro (cadenza by J. Muzyk)
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duration: PT6M47S
duration ms: 407946
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by artist: Wolfgang Amadeus Mozart
by artist: Jacek Muzyk
by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
in album: Mozart: Horn Concertos Nos. 1-4
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  date published: 2007-08-01
genre: classical
genre: classical-era
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro (cadenza by J. Muzyk)
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Horn Concerto No. 3 in E-Flat Major, K. 447: III. Allegro
type: MusicRecording
duration: PT3M48S
duration ms: 228520
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jacek Muzyk
by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
in album: Mozart: Horn Concertos Nos. 1-4
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genre: classical
genre: classical-era
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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
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T11:34:59Z
audio: Horn Concerto No. 3 in E-Flat Major, K. 447: III. Allegro
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Horn Concerto No. 4 in E-Flat Major, K. 495: I. Allegro maestoso (cadenza by J. Muzyk)
type: MusicRecording
duration: PT8M12S
duration ms: 492200
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jacek Muzyk
by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
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genre: classical
genre: classical-era
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additional property: CopyrightID
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additional property: CopyrightRegisteredAt
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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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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
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Horn Concerto No. 4 in E-Flat Major, K. 495: I. Allegro maestoso (cadenza by J. Muzyk)
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Horn Concerto No. 4 in E-Flat Major, K. 495: III. Rondo: Allegro vivace
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duration: PT3M42S
duration ms: 222546
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jacek Muzyk
by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
in album: Mozart: Horn Concertos Nos. 1-4
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  date published: 2007-08-01
genre: classical
genre: classical-era
isrc code: HKI190712111
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
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
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additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Horn Concerto No. 4 in E-Flat Major, K. 495: III. Rondo: Allegro vivace
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Instrumentalness
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Liveness
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Valence (Positivity)
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Loudness (dB)
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Key Name
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Mode Name
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Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
type: MusicRecording
duration: PT4M29S
duration ms: 269360
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jacek Muzyk
by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
in album: Mozart For Relaxation
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genre: classical
genre: classical-era
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additional property: CopyrightID
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
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Horn Concerto No. 3 in E-flat Major, K. 447: Ii. Romance: Larghetto
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duration: PT4M20S
duration ms: 260986
explicit: false
by artist: Wolfgang Amadeus Mozart
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by artist: Amadeus Chamber Orchestra of Polish Radio
by artist: Agnieszka Duczmal
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genre: classical
genre: classical-era
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additional property: CopyrightID
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
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Horn Concerto No. 3 in E-Flat Major, K. 447: II. Romance: Larghetto
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Horn Concerto No. 4 in E-Flat Major, K. 495: II. Romance: Andante cantabile
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