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track: Piano Concerto No. 4 in G Minor, Op. 40: I. Allegro (Original 1926 Version)
track: Piano Concerto No. 2 in C Minor, Op. 50: II. Romanza. Andante con moto

Piano Concerto No. 4 in G Minor, Op. 40: I. Allegro (Original 1926 Version)
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by artist: Sergei Rachmaninoff
by artist: Yevgeny Sudbin
by artist: North Carolina Symphony Orchestra
by artist: Grant Llewellyn
in album: Rachmaninov, S.: Piano Concerto No. 4 (original 1926 version) / Medtner, N.: Piano Concerto No. 2
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  date published: 2009-11-17
genre: classical
genre: classical-piano
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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: 2026-07-08T03:53:27Z
audio: Piano Concerto No. 4 in G Minor, Op. 40: I. Allegro (Original 1926 Version)
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Piano Concerto No. 2 in C Minor, Op. 50: II. Romanza. Andante con moto
type: MusicRecording
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duration ms: 563533
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by artist: Nikolai Medtner
by artist: Yevgeny Sudbin
by artist: North Carolina Symphony Orchestra
by artist: Grant Llewellyn
in album: Rachmaninov, S.: Piano Concerto No. 4 (original 1926 version) / Medtner, N.: Piano Concerto No. 2
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genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
audio: Piano Concerto No. 2 in C Minor, Op. 50: II. Romanza. Andante con moto
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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