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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: 2026-06-13T15:41:10Z
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track: Flute and Harp Concerto in C Major, K. 299: II. Andantino
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T08:56:20Z
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track: Flute and Harp Concerto in C Major, K. 299: III. Rondò. Allegro
track: Flute and Harp Concerto in C Major, K. 299: I. Allegro

Flute and Harp Concerto in C Major, K. 299: III. Rondò. Allegro
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  date published: 2017-06-16
genre: classical
genre: classical-era
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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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  date published: 2026-07-02T03:55:08Z
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Flute and Harp Concerto in C Major, K. 299: I. Allegro
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by artist: Opole Philarmonic Orchestra
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by artist: Ursula Mazurek
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  date published: 2014-05-29
genre: classical
genre: classical-era
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additional property: OTSVerifyInstructions
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  date published: 2026-06-13T13:32:09Z
audio: Flute and Harp Concerto in C Major, K. 299: I. Allegro
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