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followers: 112
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  by artist: Jiří Válek
  by artist: Hana Mullerova
  by artist: Capella Istropolitana
  by artist: Richard Edlinger
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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
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    date published: 2026-07-08T03:20:19Z
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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 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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    date published: 2026-07-08T03:20:19Z
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track: Concerto for Flute and Harp in C Major, K. 299: I. Allegro
track: Concerto for Flute and Harp in C Major, K. 299: III. Allegro
track: Concerto for Flute & Harp in C Major, K. 299: II. Andantino (Excerpt)
track: Concerto For Flute And Harp In C Major, K. 299: Concerto For Flute And Harp In C Major, K. 299: II. Andantino
track: Concerto For Flute And Harp In C Major, K. 299: II. Andantino
track: Concerto for Flute & Harp in C Major, K. 299: II. Andantino
track: Concerto for Flute and Harp in C Major, K. 299: II. Andantino (excerpt)
track: Concerto for Flute & Harp in C Major, K. 299: Concerto for Flute and Harp in C Major, K. 299: II. Andantino

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Concerto for Flute and Harp in C Major, K. 299: I. Allegro
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duration: PT10M1S
duration ms: 601000
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by artist: Wolfgang Amadeus Mozart
by artist: Jiří Válek
by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
in album: Mozart: Concerto for Flute and Harp / Sinfonia Concertante
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genre: classical-era
genre: classical-piano
genre: opera
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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 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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  date published: 2026-06-13T13:32:09Z
audio: Concerto for Flute and Harp in C Major, K. 299: I. Allegro
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Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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duration: PT7M32S
duration ms: 452000
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jiří Válek
by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
in album: Mozart: Concerto for Flute and Harp / Sinfonia Concertante
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  date published: 1989-02-15
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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additional property: OTSVerificationAPI
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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 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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  date published: 2026-06-13T15:41:10Z
audio: Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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Concerto for Flute and Harp in C Major, K. 299: III. Allegro
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duration ms: 583000
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by artist: Jiří Válek
by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
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genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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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: 2026-06-13T13:32:09Z
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Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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duration ms: 456000
explicit: false
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by artist: Capella Istropolitana
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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: 2026-07-08T03:20:19Z
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Concerto for Flute & Harp in C Major, K. 299: II. Andantino (Excerpt)
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duration ms: 456000
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by artist: Jiří Válek
by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
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  date published: 2021-11-19
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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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: 2026-07-08T03:20:19Z
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Concerto For Flute And Harp In C Major, K. 299: Concerto For Flute And Harp In C Major, K. 299: II. Andantino
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duration: PT7M35S
duration ms: 455933
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by artist: Capella Istropolitana
by artist: Hana Mullerova
by artist: Wolfgang Amadeus Mozart
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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: 2026-07-30T15:42:38Z
audio: Concerto For Flute And Harp In C Major, K. 299: Concerto For Flute And Harp In C Major, K. 299: II. Andantino
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Concerto For Flute And Harp In C Major, K. 299: II. Andantino
type: MusicRecording
duration: PT7M35S
duration ms: 455400
explicit: false
by artist: Jiří Válek
by artist: Capella Istropolitana
by artist: Hana Mullerova
by artist: Wolfgang Amadeus Mozart
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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: 2026-07-31T02:19:15Z
audio: Concerto For Flute And Harp In C Major, K. 299: II. Andantino
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Concerto for Flute and Harp in C Major, K. 299: II. Andantino
type: MusicRecording
duration: PT7M36S
duration ms: 456613
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Jiří Válek
by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
in album: 50 Best Smooth Classics
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genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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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: 2026-07-08T03:20:19Z
audio: Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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Concerto for Flute & Harp in C Major, K. 299: II. Andantino
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duration: PT7M36S
duration ms: 456000
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by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
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genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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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: 2026-07-07T16:07:00Z
audio: Concerto for Flute & Harp in C Major, K. 299: II. Andantino
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Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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duration ms: 456613
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by artist: Hana Mullerova
by artist: Capella Istropolitana
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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: 2026-07-08T03:20:19Z
audio: Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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Concerto for Flute & Harp in C Major, K. 299: Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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