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genre: chamber music
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track: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 2 - Lustig Bewegt (À La Marcia)
track: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 3 - Andante Sostenuto
track: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 1 - Mäßig Bewegt
track: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 4 - Leicht Bewegt

Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 2 - Lustig Bewegt (À La Marcia)
type: MusicRecording
duration: PT1M16S
duration ms: 76533
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by artist: David Popper
by artist: Martin Rummel
by artist: Sebastian Hartung
in album: David Popper: Etudes for Cello, Op. 76
  type: MusicAlbum
  date published: 2020-03-01
popularity: 1
genre: czech-classical
genre: post-romantic-era
isrc code: ATTE41700212
additional property: CopyrightID
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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: 2026-07-08T03:22:41Z
audio: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 2 - Lustig Bewegt (À La Marcia)
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Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 3 - Andante Sostenuto
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duration: PT1M28S
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explicit: false
by artist: David Popper
by artist: Martin Rummel
by artist: Sebastian Hartung
in album: David Popper: Etudes for Cello, Op. 76
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  date published: 2020-03-01
popularity: 1
genre: czech-classical
genre: post-romantic-era
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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: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 3 - Andante Sostenuto
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Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 1 - Mäßig Bewegt
type: MusicRecording
duration: PT1M15S
duration ms: 75560
explicit: false
by artist: David Popper
by artist: Martin Rummel
by artist: Sebastian Hartung
in album: David Popper: Etudes for Cello, Op. 76
  type: MusicAlbum
  date published: 2020-03-01
popularity: 2
genre: czech-classical
genre: post-romantic-era
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T12:24:41Z
audio: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 1 - Mäßig Bewegt
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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

Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 4 - Leicht Bewegt
type: MusicRecording
duration: PT1M32S
duration ms: 92946
explicit: false
by artist: David Popper
by artist: Martin Rummel
by artist: Sebastian Hartung
in album: David Popper: Etudes for Cello, Op. 76
  type: MusicAlbum
  date published: 2020-03-01
popularity: 1
genre: czech-classical
genre: post-romantic-era
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T08:04:30Z
audio: Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 4 - Leicht Bewegt
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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