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genre: chamber music
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followers: 146
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additional property: OTSVerifyInstructions
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  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 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. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin 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
subject of: OpenTimestamps Proof of Existence
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album: Mozart and the Organ
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    by artist: Arvid Engegard
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      date published: 2023-09-08
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    genre: opera
    genre: chamber-music
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    additional property: OTSVerifyInstructions
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-29T11:07:37Z
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  track: Church Sonata in C Major, K. 328/317c
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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
    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-08T03:20:19Z
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  track: Andante in F Major, K. 616
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album: Mozart: String Quartets - Dedicated to Haydn - K. 421, K. 428, K. 465
album: Mozart: Prussian String Quartets
album: Mozart/Hvoslef/Sæverud
album: To the Brother Peoples (Music by Lasse Thoresen)
album: Duo Brilliante
album: Nordlandslåter
album: Rosen - Tonestykker i klassisk stil av Per Bolstad
album: Anders Sørensen - 200 år
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album: Mozart, W.A.: Cassations, K. 63 and 99 / Adagio and Fugue, K. 546
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Church Sonata in C Major, K. 336/336d
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by artist: Anders Eidsten Dahl
by artist: Arvid Engegard
by artist: Atle Sponberg
by artist: Embrik Snerte
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genre: classical
genre: classical-era
genre: classical-piano
genre: opera
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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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T13:04:34Z
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Andante in F Major, K. 616
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by artist: Anders Eidsten Dahl
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genre: classical
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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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Church Sonata in C Major, K.328/317c
type: MusicAlbum
date published: 2023-08-11

W.A. Mozart: Concerto for Flute, Harp and Orchestra & Sinfonia Concertante for Four Winds
type: MusicAlbum
date published: 2015-02-18

Mozart Piano Concertos Nos. 21 and 22
type: MusicAlbum
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Bartók: Violin Sonata No. 2; Contrasts; Solo Violin Sonata
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:20:19Z
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Schumann: Piano Quintet, Op. 44 / Piano Quartet, Op. 47
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-30T22:27:30Z
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  subject of: OpenTimestamps Proof of Existence
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track: Piano Quintet, Op. 44: IV. Finale. Allegro, ma non troppo
track: Piano Quartet, Op. 47: I. Sostenuto assai. Allegro, ma non troppo
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date published: 2026-07-08T03:39:04Z

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Piano Quintet, Op. 44: IV. Finale. Allegro, ma non troppo
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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subject of: OpenTimestamps Proof of Existence
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subject of: OpenTimestamps Proof of Existence
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Mozart: String Quartets - Dedicated to Haydn - K. 421, K. 428, K. 465
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Mozart: Prussian String Quartets
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Mozart/Hvoslef/Sæverud
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To the Brother Peoples (Music by Lasse Thoresen)
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Duo Brilliante
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Nordlandslåter
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Rosen - Tonestykker i klassisk stil av Per Bolstad
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Anders Sørensen - 200 år
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Walton / Sinding
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Schumann Violin Sonatas, Op. 105 & Op. 121
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Filharmonika
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Mozart, W.A.: Cassations, K. 63 and 99 / Adagio and Fugue, K. 546
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The World of Bartók
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