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genre: chamber music
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track: Concerto for 2 Clarinets in E-Flat Major, Op. 35: III. Alla Polacca
track: Concerto for 2 Clarinets in E-Flat Major, Op. 35: I. Allegro
track: Concerto for 2 Clarinets in E-Flat Major, Op. 35: II. Adagio

Concerto for 2 Clarinets in E-Flat Major, Op. 35: III. Alla Polacca
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by artist: Franz Krommer
by artist: Kalman Berkes
by artist: Tomoko Takashima
by artist: Nicolaus Esterhazy Sinfonia
in album: Krommer: Clarinet Concertos Opp. 35, 36 and 91
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  date published: 1995-03-13
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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: 2026-07-08T03:20:19Z
audio: Concerto for 2 Clarinets in E-Flat Major, Op. 35: III. Alla Polacca
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Concerto for 2 Clarinets in E-Flat Major, Op. 35: I. Allegro
type: MusicRecording
duration: PT12M1S
duration ms: 721493
explicit: false
by artist: Franz Krommer
by artist: Kalman Berkes
by artist: Tomoko Takashima
by artist: Nicolaus Esterhazy Sinfonia
in album: Krommer: Clarinet Concertos Opp. 35, 36 and 91
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  date published: 1995-03-13
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  date published: 2026-07-30T08:04:30Z
audio: Concerto for 2 Clarinets in E-Flat Major, Op. 35: I. Allegro
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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

Concerto for 2 Clarinets in E-Flat Major, Op. 35: II. Adagio
type: MusicRecording
duration: PT6M15S
duration ms: 375733
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by artist: Franz Krommer
by artist: Kalman Berkes
by artist: Tomoko Takashima
by artist: Nicolaus Esterhazy Sinfonia
in album: Krommer: Clarinet Concertos Opp. 35, 36 and 91
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  date published: 1995-03-13
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  date published: 2026-07-31T05:17:02Z
audio: Concerto for 2 Clarinets in E-Flat Major, Op. 35: II. Adagio
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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