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Horn Concerto No. 1 in D Major, K. 412: I. Allegro
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Horn Concerto No. 1 in D Major, K. 412: II. Rondo: Allegro
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Horn Concerto No. 2 in E-Flat Major, K. 417: I. Allegro maestoso
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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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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
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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
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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
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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
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: 2026-07-02T11:34:59Z
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
isrc code: HKI190712109
additional property: CopyrightID
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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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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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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
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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: 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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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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  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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Loudness (dB)
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Symphony No. 40 in G Minor, K. 550: II. Andante
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by artist: Capella Istropolitana
by artist: Barry Wordsworth
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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: 2026-07-21T17:11:38Z
audio: Symphony No. 40 in G Minor, K. 550: II. Andante
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Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
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duration: PT3M36S
duration ms: 216146
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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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additional property: OTSVerificationAPI
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Piano Concerto No. 6 in B-Flat Major, K. 238: II. Andante un poco adagio
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String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
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Piano Sonata No. 17 in B-Flat Major, K. 570: II. Adagio
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Symphony No. 39 in E-Flat Major, K. 543: II. Andante con moto
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Così fan tutte, K. 588, Act I Scene 2: Terzet - Soave sia il vento
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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Mozart For Relaxation
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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
  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:53:27Z
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  additional property: OTSVerificationAPI
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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
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  subject of: OpenTimestamps Proof of Existence
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track: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
track: Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
track: String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
track: Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
track: Symphony No. 40 in G Minor, K. 550: Ii. Andante
track: Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
track: Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
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track: String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
track: Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
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OTSBitcoinBlockVerifyURL
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OTSVerificationAPI
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OTSTimestamp
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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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0e719cfca95da0ebc40d6ac033333a217864965629cf43f4518b091a2acad0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199274702.
date published: 2026-07-08T08:56:20Z

Serenade No. 13 in G Major, K. 525, "eine kleine Nachtmusik": Ii. Romanze: Andante
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Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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by artist: Capella Istropolitana
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
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String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
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Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
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Symphony No. 40 in G Minor, K. 550: Ii. Andante
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Symphony No. 40 in G Minor, K. 550: Ii. Andante
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Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
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Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
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Symphony No. 14 in A Major, K. 114: Ii. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Symphony No. 14 in A Major, K. 114: Ii. Andante
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String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
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Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
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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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Vesperae solennes de Confessore, K. 339: V. Laudate Dominum
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subject of: OpenTimestamps Proof of Existence
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audio: Vesperae solennes de Confessore, K. 339: V. Laudate Dominum
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:22:41Z
  audio: Clarinet Concerto in A Major, K. 622: Ii. Adagio
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track: Serenade No. 13 in G Major, K. 525, "eine kleine Nachtmusik": Ii. Romanze: Andante
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:53:27Z
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  subject of: OpenTimestamps Proof of Existence
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track: Symphony No. 40 in G Minor, K. 550: Ii. Andante
track: Piano Sonata No. 12 in F Major, K. 332: Ii. Adagio
track: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
track: Violin Sonata No. 17 in C Major, K. 296: Ii. Andante sostenuto
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T08:56:20Z

Piano Concerto No. 23 in A Major, K. 488: Ii. Adagio
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Symphony No. 40 in G Minor, K. 550: Ii. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Symphony No. 40 in G Minor, K. 550: Ii. Andante
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Piano Sonata No. 12 in F Major, K. 332: Ii. Adagio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Piano Sonata No. 12 in F Major, K. 332: Ii. Adagio
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Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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Violin Sonata No. 17 in C Major, K. 296: Ii. Andante sostenuto
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Horn Concerto No. 3 in E-flat Major, K. 447: Ii. Romance: Larghetto
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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Symphony No. 40 in G Minor, K. 550: II. Andante
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Concerto for Flute & Harp in C Major, K. 299: II. Andantino
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Barbara Kaszuba - My Music (World Premiere Recording)
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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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI190712104.
  date published: 2026-07-08T03:53:27Z
audio: Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 100.753
  additional property: Musical Key
    type: PropertyValue
    value: 10
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.11
  additional property: Energy
    type: PropertyValue
    value: 0.065
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.99
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.927
  additional property: Liveness
    type: PropertyValue
    value: 0.167
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.168
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.983
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major