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genre: classical piano
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track: "Milonga del Angel", para Dos Pianos, Viola, Contrabajo y Bandoneón
track: "Para el Recorrido", para Piano, Viola, Contrabajo y Bandoneón
track: Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: III. Rondo. Allegro (Live)
track: "Libertango", para Piano, Viola, Contrabajo y Bandoneón
track: Le Carnaval des animaux, R. 125: XIII. Le cygne
track: Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: I. Allegro vivace (Live)
track: Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: II. Adagio con espressione (Live)

"Milonga del Angel", para Dos Pianos, Viola, Contrabajo y Bandoneón
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by artist: Astor Piazzolla
by artist: Martha Argerich
by artist: Daniel Rivera
by artist: Lyda Chen
by artist: Enrique Fagone
by artist: Néstor Marconi
in album: Martha Argerich - Daniel Rivera - Néstor Marconi, en el Teatro El Círculo de Rosario, Vol. 4, Homenaje a Astor Piazzolla
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: "Milonga del Angel", para Dos Pianos, Viola, Contrabajo y Bandoneón
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"Para el Recorrido", para Piano, Viola, Contrabajo y Bandoneón
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by artist: Gabriele Baldocci
by artist: Lyda Chen
by artist: Enrique Fagone
in album: Martha Argerich - Daniel Rivera - Néstor Marconi, en el Teatro El Círculo de Rosario, Vol. 4, Homenaje a Astor Piazzolla
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genre: bandoneon
genre: tango
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additional property: OTSTimestamp
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: "Para el Recorrido", para Piano, Viola, Contrabajo y Bandoneón
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Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: III. Rondo. Allegro (Live)
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by artist: Ludwig van Beethoven
by artist: Renaud Capuçon
by artist: Lyda Chen
by artist: Gautier Capuçon
by artist: Martha Argerich
in album: Live from the Lugano Festival 2005
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T11:02:43Z
audio: Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: III. Rondo. Allegro (Live)
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"Libertango", para Piano, Viola, Contrabajo y Bandoneón
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duration ms: 287720
explicit: false
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by artist: Martha Argerich
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by artist: Enrique Fagone
by artist: Néstor Marconi
in album: Martha Argerich - Daniel Rivera - Néstor Marconi, en el Teatro El Círculo de Rosario, Vol. 4, Homenaje a Astor Piazzolla
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popularity: 1
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-08-01T00:10:46Z
audio: "Libertango", para Piano, Viola, Contrabajo y Bandoneón
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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

Le Carnaval des animaux, R. 125: XIII. Le cygne
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genre: classical
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  date published: 2026-07-31T12:24:41Z
audio: Le Carnaval des animaux, R. 125: XIII. Le cygne
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Beethoven: Piano Quartets, WoO 36: No. 3 in C Major: I. Allegro vivace (Live)
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by artist: Ludwig van Beethoven
by artist: Renaud Capuçon
by artist: Lyda Chen
by artist: Gautier Capuçon
by artist: Martha Argerich
in album: Live from the Lugano Festival 2005
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