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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-16T02:39:16Z
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album: Tchaikovsky: Overtures and Fantasies
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  date published: 1993-09-05
album: Aram Khachaturian: Cello concertos
  type: MusicAlbum
  date published: 1995-01-01
album: A. Liadov: Orchestral Works
  type: MusicAlbum
  date published: 2004
track: Cello Concerto No. 1 in G minor, Op. 49
track: Cello Concerto No. 2 in C minor, Op. 77

Cello Concerto No. 1 in G minor, Op. 49
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by artist: Dmitry Kabalevsky
by artist: Marina Tarasova
by artist: The Symphony Orchestra of Russia
by artist: Veronika Duderova
in album: Kabalevsky: Cello Concertos 1 & 2
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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: 2026-07-08T03:20:19Z
audio: Cello Concerto No. 1 in G minor, Op. 49
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Cello Concerto No. 1 in G minor, Op. 49
type: MusicRecording
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by artist: Marina Tarasova
by artist: The Symphony Orchestra of Russia
by artist: Veronika Duderova
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T10:01:58Z
audio: Cello Concerto No. 1 in G minor, Op. 49
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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

Cello Concerto No. 1 in G minor, Op. 49
type: MusicRecording
duration: PT6M54S
duration ms: 414280
explicit: false
by artist: Dmitry Kabalevsky
by artist: Marina Tarasova
by artist: Veronika Duderova
by artist: The Symphony Orchestra of Russia
in album: Kabalevsky: Cello Concertos 1 & 2
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T01:51:26Z
audio: Cello Concerto No. 1 in G minor, Op. 49
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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

Cello Concerto No. 2 in C minor, Op. 77
type: MusicRecording
duration: PT31M9S
duration ms: 1869506
explicit: false
by artist: Dmitry Kabalevsky
by artist: Marina Tarasova
by artist: Veronika Duderova
by artist: The Symphony Orchestra of Russia
in album: Kabalevsky: Cello Concertos 1 & 2
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  date published: 2010-10-05
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T08:04:30Z
audio: Cello Concerto No. 2 in C minor, Op. 77
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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