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genre: chamber music
description: The Cleveland Quartet was a string quartet founded in 1969 by violinist Donald Weilerstein, at the time an instructor at the Cleveland Institute of Music, whose director Victor Babin had secured fundi
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album: Ultimate Classical Masterpieces: Beethoven, Schubert, Mendelssohn
album: Beautiful Wedding: Classical Music for the Wedding Dinner
album: Big Dvorak Box
album: a calm playlist for reading, studying or writing
album: Majestic Melodies: Tchaikovsky, Beethoven, Liszt
album: Beethoven: The Complete Quartets
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album: Beethoven: String Quartets, Op. 18 Nos. 1-3
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album: Schumann: Piano Quintet and Piano Quartet
album: Mozart: String Quartets Nos. 14, K. 387 & 15, K. 421
album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
album: Schubert: Piano Quintet in A Major, Op. 114, D. 667 "Trout" & String Quartet No. 13 in A Minor, Op. 29, D. 804 "Rosamunde"
album: Borodin: String Quartet No. 2 in D Major - Smetana: String Quartet No. 1 in E Minor, JB 1:105 "From My Life"
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album: Schubert: Quintet in C Major (Remastered)
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album: Brahms: The String Sextets, Op. 18 & Op. 36 (2023 Remastered Version)
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album: Barber: String Quartet, Op. 11 - Ives: String Quartet No. 2 & Scherzo (2023 Remastered Version)
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album: Schubert: String Quartet No. 14, D. 810 - Mozart: Adagio and Fugue in C Minor, K. 546 (2023 Remastered Version)
album: Brahms: The Complete String Quartets (2023 Remastered Version)
album: Breathe: Relaxing Music from the Movies
album: Calm: Relaxing Music From the Movies
album: Brahms: Quintet in B Minor for Clarinet and Strings, Op. 115

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a calm playlist for reading, studying or writing
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-29T21:51:49Z
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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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  by artist: Cincinnati Pops Orchestra
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  by artist: Steven Reineke
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  subject of: OpenTimestamps Proof of Existence
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track: 2 Arabesques, L. 66: No. 1, Andante con moto (Transcr. Y. Kondonassis)
track: Symphony No. 17 in G Major, K. 129: II. Andante
track: 2 Piano Pieces, Op. 157: No. 2, La fileuse
track: Nocturne No. 9 in E-Flat Major. Andantino
track: Flowers For Emmett Till
track: 3 Mélodies, Op. 7: No. 1, Après un rêve (Arr. Y. Kondonassis)
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OTSVerificationAPI
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OTSTimestamp
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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

OpenTimestamps Proof of Existence
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description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67eca0d311a0b7df7a3cdcab62067f80f8d098af4a50b7867a0e120e19a06342. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10301440.
date published: 2026-07-08T03:20:19Z

Feather Theme (From “Forrest Gump”)
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additional property: Valence (Positivity)
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2 Arabesques, L. 66: No. 1, Andante con moto (Transcr. Y. Kondonassis)
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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: 2 Arabesques, L. 66: No. 1, Andante con moto (Transcr. Y. Kondonassis)
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Symphony No. 17 in G Major, K. 129: II. Andante
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by artist: Prague Chamber Orchestra
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popularity: 2
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genre: classical-era
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genre: chamber-music
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additional property: OTSVerificationAPI
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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: 2026-07-31T22:27:44Z
audio: Symphony No. 17 in G Major, K. 129: II. Andante
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by artist: John O'Conor
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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: 2 Piano Pieces, Op. 157: No. 2, La fileuse
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Nocturne No. 9 in E-Flat Major. Andantino
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by artist: John O'Conor
in album: a calm playlist for reading, studying or writing
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1d134c9ca5579f3bf610f2aad5ced50a65f5098a531d516ce6bd115db493ba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10307199.
  date published: 2026-07-08T03:20:19Z
audio: Nocturne No. 9 in E-Flat Major. Andantino
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Flowers For Emmett Till
type: MusicRecording
duration: PT3M1S
duration ms: 181506
explicit: false
by artist: Russell Malone
by artist: Benny Green
in album: a calm playlist for reading, studying or writing
  type: MusicAlbum
  date published: 2024-12-17
popularity: 2
isrc code: USTE10460406
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10460406
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d6944a7468f031387800bb3b7ebe18a25c4f30a8316ea87b8196b3617e5048. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10460406.
  date published: 2026-07-08T03:20:19Z
audio: Flowers For Emmett Till
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3 Mélodies, Op. 7: No. 1, Après un rêve (Arr. Y. Kondonassis)
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duration: PT3M13S
duration ms: 193133
explicit: false
by artist: Gabriel Fauré
by artist: Yolanda Kondonassis
in album: a calm playlist for reading, studying or writing
  type: MusicAlbum
  date published: 2024-12-17
popularity: 2
isrc code: USTE10602590
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10602590
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T15:20:15Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4db9253ff0788dda910b876576ce792b2c438be5a90ebebbf24057930464f6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10602590.
  date published: 2026-07-31T15:20:15Z
audio: 3 Mélodies, Op. 7: No. 1, Après un rêve (Arr. Y. Kondonassis)
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Nocturne No. 15 in C Major. Molto moderato
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duration: PT3M43S
duration ms: 223493
explicit: false
by artist: John Field
by artist: John O'Conor
in album: a calm playlist for reading, studying or writing
  type: MusicAlbum
  date published: 2024-12-17
popularity: 1
isrc code: USTE10313199
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bfac04ac9737ef71b82fd7b1d0541be8bc503d6607283aaae76d986c6ce4a9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10313199.
  date published: 2026-07-08T03:20:19Z
audio: Nocturne No. 15 in C Major. Molto moderato
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Majestic Melodies: Tchaikovsky, Beethoven, Liszt
type: MusicAlbum
date published: 2024-03-20

Beethoven: The Complete Quartets
type: MusicAlbum
date published: 1997-11-01

Beethoven: String Quartet No. 12 In E-Flat Major, Op. 127 & String Quartet No. 14 in C-Sharp Minor, Op. 131
type: MusicAlbum
date published: 1997-05-01

Beethoven: String Quartet No. 15 in A Minor, Op. 132 & String Quartet No. 16 in F Major, Op. 135
type: MusicAlbum
date published: 1997-02-01

Beethoven: String Quartet No. 13 in B-Flat Major, Op. 130 & Große Fuge in B-Flat Major, Op. 133
type: MusicAlbum
date published: 1996-10-01

The Farewell Recording
type: MusicAlbum
date published: 1996-06-01

Beethoven: String Quartets, Op. 18 Nos. 4 & 5
type: MusicAlbum
date published: 1995-11-01

Beethoven: String Quartets, Op. 18 Nos. 1-3
type: MusicAlbum
date published: 1995-03-01

Brahms: String Quartets Nos. 1 in C Minor & 2 in A Minor
type: MusicAlbum
date published: 1994-07-01
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  duration: PT10M38S
  duration ms: 638000
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  by artist: Johannes Brahms
  by artist: Cleveland Quartet
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    date published: 1994-07-01
  genre: classical
  genre: german-romanticism
  genre: classical-piano
  genre: late-romantic-era
  genre: chamber-music
  genre: orchestral
  isrc code: USTE10301346
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  additional property: CopyrightRegisteredAt
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    value: 2026-07-07T06:22:28+00:00
  additional property: CopyrightChainExplorerURL
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    value: https://explorer.copyrightchains.com/tx/0x4693a467f4b392b2762d90bae65032dc569a64ac4500b83f5c871df357f01fa7
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  additional property: OTSBitcoinBlock
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    value: 957118
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957118
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10301346
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4693a467f4b392b2762d90bae65032dc569a64ac4500b83f5c871df357f01fa7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10301346.
    date published: 2026-07-08T03:20:19Z
  audio: String Quartet No. 1 in C Minor, Op. 51 No. 1: I. Allegro
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    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Time Signature
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      value: 5
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      value: 0.32
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track: String Quartet No. 2 in A Minor, Op. 51 No. 2: I. Allegro non troppo
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  duration: PT12M58S
  duration ms: 778600
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  by artist: Johannes Brahms
  by artist: Cleveland Quartet
  in album: Brahms: String Quartets Nos. 1 in C Minor & 2 in A Minor
    type: MusicAlbum
    date published: 1994-07-01
  genre: classical
  genre: german-romanticism
  genre: classical-piano
  genre: late-romantic-era
  genre: chamber-music
  genre: orchestral
  isrc code: USTE10305346
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
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  additional property: CopyrightChainExplorerURL
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305346
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-08T03:20:19Z
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      value: 0.148
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      value: -22.2
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Beethoven: String Quartet No. 10 in E-Flat Major, Op. 74 "Harp" & String Quartet No. 11 in F Minor, Op. 95 "Quartetto serioso"
type: MusicAlbum
date published: 1994-06-01

Beethoven: String Quartets, Op. 59 Nos. 2 & 3 "Razumovskys"
type: MusicAlbum
date published: 1993-10-01

Beethoven: String Quartet No. 6 in B-Flat Major, Op. 18 No. 6 & String Quartet No. 7 in F Major, Op. 59 No. 1 "Razumovsky"
type: MusicAlbum
date published: 1993-01-01

Schumann: Piano Quintet and Piano Quartet
type: MusicAlbum
date published: 1993

Mozart: String Quartets Nos. 14, K. 387 & 15, K. 421
type: MusicAlbum
date published: 1992-02-01
track: String Quartet No. 15 in D Minor, K. 421: I. Allegro moderato
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  duration: PT10M11S
  duration ms: 611160
  explicit: false
  by artist: Wolfgang Amadeus Mozart
  by artist: Cleveland Quartet
  in album: Mozart: String Quartets Nos. 14, K. 387 & 15, K. 421
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    date published: 1992-02-01
  genre: classical
  genre: classical-era
  genre: classical-piano
  genre: opera
  genre: chamber-music
  genre: concerto
  isrc code: USTE10305297
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305297
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-30T21:35:24Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe027b6655ca6b7534db5bfd6f407a6274b362e871ef6e0c587dabbc114437b14. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305297.
    date published: 2026-07-30T21:35:24Z
  audio: String Quartet No. 15 in D Minor, K. 421: I. Allegro moderato
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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  type: MusicRecording
  duration: PT3M52S
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  by artist: Wolfgang Amadeus Mozart
  by artist: Cleveland Quartet
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    type: MusicAlbum
    date published: 1992-02-01
  genre: classical
  genre: classical-era
  genre: classical-piano
  genre: opera
  genre: chamber-music
  genre: concerto
  isrc code: USTE10307297
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
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  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x34c930eba9056a6a916c10487c78959aad3e09f64c216e101362add26a8a3368
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960403
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10307297
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T13:04:34Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c930eba9056a6a916c10487c78959aad3e09f64c216e101362add26a8a3368. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10307297.
    date published: 2026-07-31T13:04:34Z
  audio: String Quartet No. 15 in D Minor, K. 421: III. Menuetto. Allegretto
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
type: MusicAlbum
date published: 1991-10-01
track: String Quartet No. 14 in A-Flat Major, Op. 105, B. 193: I. Adagio, ma non troppo - Allegro appassionato
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  duration: PT7M29S
  duration ms: 449133
  explicit: false
  by artist: Antonín Dvořák
  by artist: Cleveland Quartet
  in album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
    type: MusicAlbum
    date published: 1991-10-01
  genre: classical
  genre: late-romantic-era
  genre: czech-classical
  isrc code: USTE10301283
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-08-01T02:11:44+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
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  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960500
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960500
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10301283
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-08-01T03:13:03Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295d4e4cecc95e620909f344576eeb8cf9d31feaf1280d97f73e92b4a5282ba5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10301283.
    date published: 2026-08-01T03:13:03Z
  audio: String Quartet No. 14 in A-Flat Major, Op. 105, B. 193: I. Adagio, ma non troppo - Allegro appassionato
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Liveness
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    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.073
    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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track: String Quartet No. 14 in A-Flat Major, Op. 105, B. 193: III. Lento e molto cantabile
  type: MusicRecording
  duration: PT8M25S
  duration ms: 505960
  explicit: false
  by artist: Antonín Dvořák
  by artist: Cleveland Quartet
  in album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
    type: MusicAlbum
    date published: 1991-10-01
  genre: classical
  genre: late-romantic-era
  genre: czech-classical
  isrc code: USTE10303283
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-31T16:27:55+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x1270297ca90a3c3ca2556a5d07cc363fd03db6c7016b58ab8b5b6dd57d363c24
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960441
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10303283
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T17:29:52Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1270297ca90a3c3ca2556a5d07cc363fd03db6c7016b58ab8b5b6dd57d363c24. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10303283.
    date published: 2026-07-31T17:29:52Z
  audio: String Quartet No. 14 in A-Flat Major, Op. 105, B. 193: III. Lento e molto cantabile
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    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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track: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": I. Allegro ma non troppo
  type: MusicRecording
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  duration ms: 548506
  explicit: false
  by artist: Antonín Dvořák
  by artist: Cleveland Quartet
  in album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
    type: MusicAlbum
    date published: 1991-10-01
  genre: classical
  genre: late-romantic-era
  genre: czech-classical
  isrc code: USTE10305283
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T19:57:26+00:00
  additional property: CopyrightChainExplorerURL
  additional property: OTSHash
  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": I. Allegro ma non troppo
track: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": II. Lento
track: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": III. Molto vivace
track: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": IV. Finale. Vivace ma non troppo

CopyrightChainExplorerURL
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value: https://explorer.copyrightchains.com/tx/0x8a9eef3812a95a3da3c5cfb4046c6cae6e477f1f5d737eb5795867882d1a723d

OTSHash
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OTSBitcoinBlock
type: PropertyValue
value: 957118

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957118

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305283

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:20:19Z

OTSVerifyInstructions
type: PropertyValue
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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9eef3812a95a3da3c5cfb4046c6cae6e477f1f5d737eb5795867882d1a723d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305283.
date published: 2026-07-08T03:20:19Z

String Quartet No. 12 in F Major, Op. 96, B. 179 "American": I. Allegro ma non troppo
type: AudioObject
additional property: Tempo (BPM)
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additional property: Musical Key
  type: PropertyValue
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additional property: Mode (Major/Minor)
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additional property: Time Signature
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additional property: Danceability
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additional property: Energy
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additional property: Speechiness
  type: PropertyValue
  value: 0.045
additional property: Acousticness
  type: PropertyValue
  value: 0.915
additional property: Instrumentalness
  type: PropertyValue
  value: 0.074
additional property: Liveness
  type: PropertyValue
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additional property: Valence (Positivity)
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  value: 0.125
additional property: Loudness (dB)
  type: PropertyValue
  value: -22.508
additional property: Key Name
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additional property: Mode Name
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String Quartet No. 12 in F Major, Op. 96, B. 179 "American": II. Lento
type: MusicRecording
duration: PT7M6S
duration ms: 426493
explicit: false
by artist: Antonín Dvořák
by artist: Cleveland Quartet
in album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
  type: MusicAlbum
  date published: 1991-10-01
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: USTE10306283
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T02:39:25+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x703b8b127c2d3ba9d702dacb31f9ef48b7255f3092bd68ff2973b9966daae905
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957118
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10306283
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703b8b127c2d3ba9d702dacb31f9ef48b7255f3092bd68ff2973b9966daae905. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10306283.
  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": II. Lento
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  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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String Quartet No. 12 in F Major, Op. 96, B. 179 "American": III. Molto vivace
type: MusicRecording
duration: PT3M46S
duration ms: 226666
explicit: false
by artist: Antonín Dvořák
by artist: Cleveland Quartet
in album: Dvořák: Quartets Nos. 12 in F Major, Op. 96, B. 179 "American" & 14 in A-Flat Major, Op. 105, B. 193
  type: MusicAlbum
  date published: 1991-10-01
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: USTE10307283
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T12:25:42+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x29bed9cffb648321121c4aaf0719e0fee430f356f059bf062d3c885b4e15cdfa
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 960403
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960403
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10307283
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T13:04:34Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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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String Quartet No. 12 in F Major, Op. 96, B. 179 "American": IV. Finale. Vivace ma non troppo
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by artist: Cleveland Quartet
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genre: classical
genre: late-romantic-era
genre: czech-classical
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additional property: OTSVerificationAPI
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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: 2026-07-30T10:42:33Z
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Schubert: Piano Quintet in A Major, Op. 114, D. 667 "Trout" & String Quartet No. 13 in A Minor, Op. 29, D. 804 "Rosamunde"
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date published: 1990-11-01

Borodin: String Quartet No. 2 in D Major - Smetana: String Quartet No. 1 in E Minor, JB 1:105 "From My Life"
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Mendelssohn: String Quartet No. 2 in A Major & String Octet in E-Flat Major
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T17:29:52Z
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:22:41Z
  audio: String Quartet in G Minor, Op. 10, L. 85: III. Andantino doucement expressif
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track: String Quartet in F Major, M. 35: I. Allegro moderato
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  subject of: OpenTimestamps Proof of Existence
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OTSBitcoinBlockVerifyURL
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OTSVerificationAPI
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OTSTimestamp
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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

OpenTimestamps Proof of Existence
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encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff84ed6c14832655efcde926da22c41abc511a87a041a06a40e5179c5d41dcfe. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305111.
date published: 2026-07-31T13:06:57Z

String Quartet in F Major, M. 35: I. Allegro moderato
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additional property: Tempo (BPM)
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Schubert: Quintet in C Major (Remastered)
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date published: 1984
track: String Quintet in C Major, D. 956, Op. 163: I. Allegro ma non troppo
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  by artist: Yo-Yo Ma
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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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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T03:55:08Z
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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  duration: PT10M43S
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  by artist: Franz Schubert
  by artist: Yo-Yo Ma
  by artist: Cleveland Quartet
  in album: Schubert: Quintet in C Major (Remastered)
    type: MusicAlbum
    date published: 1984
  genre: classical
  genre: classical-piano
  genre: chamber-music
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  additional property: CopyrightID
  additional property: CopyrightStatus
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  additional property: CopyrightRegisteredAt
  additional property: CopyrightChainExplorerURL
  additional property: OTSHash
  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
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track: String Quintet in C Major, D. 956, Op. 163: IV. Allegretto

CopyrightRegisteredAt
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CopyrightChainExplorerURL
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value: https://explorer.copyrightchains.com/tx/0x7a96e99dceceed9cd04430f524b3a9964a1c8a04c3d09b12eea209765f85e94d

OTSHash
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OTSBitcoinBlock
type: PropertyValue
value: 960121

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/960121

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18300317

OTSTimestamp
type: PropertyValue
value: 2026-07-29T15:22:21Z

OTSVerifyInstructions
type: PropertyValue
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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a96e99dceceed9cd04430f524b3a9964a1c8a04c3d09b12eea209765f85e94d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18300317.
date published: 2026-07-29T15:22:21Z

String Quintet in C Major, D. 956, Op. 163: III. Scherzo. Presto
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Mode Name
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String Quintet in C Major, D. 956, Op. 163: IV. Allegretto
type: MusicRecording
duration: PT9M8S
duration ms: 548613
explicit: false
by artist: Franz Schubert
by artist: Yo-Yo Ma
by artist: Cleveland Quartet
in album: Schubert: Quintet in C Major (Remastered)
  type: MusicAlbum
  date published: 1984
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957061
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18300318
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T16:07:00Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08c8b68cc9b39a65ceda8ec521060fb761b6f5100cd13a02b20283ed071afc9. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18300318.
  date published: 2026-07-07T16:07:00Z
audio: String Quintet in C Major, D. 956, Op. 163: IV. Allegretto
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Beethoven: The Late String Quartets (2023 Remastered Version)
type: MusicAlbum
date published: 1983-05-01

Brahms: The String Sextets, Op. 18 & Op. 36 (2023 Remastered Version)
type: MusicAlbum
date published: 1982
track: String Sextet No. 1 in B-Flat Major, Op. 18: I. Allegro ma non troppo - 2023 Remastered Version
  type: MusicRecording
  duration: PT15M20S
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  explicit: false
  by artist: Johannes Brahms
  by artist: Cleveland Quartet
  by artist: Pinchas Zukerman
  by artist: Bernard Greenhouse
  in album: Brahms: The String Sextets, Op. 18 & Op. 36 (2023 Remastered Version)
    type: MusicAlbum
    date published: 1982
  genre: classical
  genre: german-romanticism
  genre: classical-piano
  genre: late-romantic-era
  genre: chamber-music
  genre: orchestral
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  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T20:10:10+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x9489873197e733366b5a6dc985dcbf24e080a6b2ee9f1dcbec7434e744227ea4
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957120
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957120
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12200913
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:22:41Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9489873197e733366b5a6dc985dcbf24e080a6b2ee9f1dcbec7434e744227ea4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12200913.
    date published: 2026-07-08T03:22:41Z
  audio: String Sextet No. 1 in B-Flat Major, Op. 18: I. Allegro ma non troppo - 2023 Remastered Version
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
      type: PropertyValue
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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Beethoven: The Six Early Quartets (2023 Remastered Version)
type: MusicAlbum
date published: 1980-01-01

Beethoven: The Five Middle Quartets (2023 Remastered Version)
type: MusicAlbum
date published: 1979-04-01

Schubert: Piano Quintet "The Trout"
type: MusicAlbum
date published: 1978-01-01
track: Piano Quintet in A, D.667 - "The Trout": 1. Allegro vivace
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  duration: PT13M27S
  duration ms: 807573
  explicit: false
  by artist: Franz Schubert
  by artist: Alfred Brendel
  by artist: Cleveland Quartet
  by artist: James van Demark
  in album: Schubert: Piano Quintet "The Trout"
    type: MusicAlbum
    date published: 1978-01-01
  genre: classical
  genre: classical-piano
  genre: chamber-music
  isrc code: NLA507706301
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
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  additional property: CopyrightChainExplorerURL
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  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956889
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706301
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-06T06:56:49Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8261af162bfe9835c9c2e002f649b5b1bb657e8fed7e9c32828b9bed21b2f12. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706301.
    date published: 2026-07-06T06:56:49Z
  audio: Piano Quintet in A, D.667 - "The Trout": 1. Allegro vivace
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Mode Name
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track: Piano Quintet in A, D.667 - "The Trout": 2. Andante
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  duration: PT7M10S
  duration ms: 430560
  explicit: false
  by artist: Franz Schubert
  by artist: Alfred Brendel
  by artist: Cleveland Quartet
  by artist: James van Demark
  in album: Schubert: Piano Quintet "The Trout"
    type: MusicAlbum
    date published: 1978-01-01
  genre: classical
  genre: classical-piano
  genre: chamber-music
  isrc code: NLA507706302
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T21:59:22+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x943ca0cd85d167aa3f62108f9c668560c2dbbdd4964fe977f41a42c633a95491
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957118
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957118
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706302
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943ca0cd85d167aa3f62108f9c668560c2dbbdd4964fe977f41a42c633a95491. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706302.
    date published: 2026-07-08T03:20:19Z
  audio: Piano Quintet in A, D.667 - "The Trout": 2. Andante
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 113.252
    additional property: Musical Key
      type: PropertyValue
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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track: Piano Quintet in A, D.667 - "The Trout": 3. Scherzo (Presto)
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  duration: PT3M59S
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  explicit: false
  by artist: Franz Schubert
  by artist: Alfred Brendel
  by artist: Cleveland Quartet
  by artist: James van Demark
  in album: Schubert: Piano Quintet "The Trout"
    type: MusicAlbum
    date published: 1978-01-01
  genre: classical
  genre: classical-piano
  genre: chamber-music
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  additional property: CopyrightID
  additional property: CopyrightStatus
  additional property: CopyrightRegisteredAt
  additional property: CopyrightChainExplorerURL
  additional property: OTSHash
  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Piano Quintet in A, D.667 - "The Trout": 3. Scherzo (Presto)
track: Piano Quintet in A, D.667 - "The Trout": 4. Thema - Andantino - Variazioni I-V - Allegretto
track: Piano Quintet in A, D.667 - "The Trout": 5. Finale (Allegro giusto)

CopyrightStatus
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CopyrightRegisteredAt
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CopyrightChainExplorerURL
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OTSHash
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OTSBitcoinBlock
type: PropertyValue
value: 957118

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957118

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706303

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:20:19Z

OTSVerifyInstructions
type: PropertyValue
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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc536cb4e27422e6b7a7b351a2e5985b83d5d558cca526552c91e8819a8a247. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507706303.
date published: 2026-07-08T03:20:19Z

Piano Quintet in A, D.667 - "The Trout": 3. Scherzo (Presto)
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 164.629
additional property: Musical Key
  type: PropertyValue
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additional property: Mode (Major/Minor)
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additional property: Time Signature
  type: PropertyValue
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additional property: Danceability
  type: PropertyValue
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Key Name
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additional property: Mode Name
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Piano Quintet in A, D.667 - "The Trout": 4. Thema - Andantino - Variazioni I-V - Allegretto
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by artist: Alfred Brendel
by artist: Cleveland Quartet
by artist: James van Demark
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerificationAPI
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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 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: 2026-07-07T18:39:05Z
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Piano Quintet in A, D.667 - "The Trout": 5. Finale (Allegro giusto)
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by artist: Alfred Brendel
by artist: Cleveland Quartet
by artist: James van Demark
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T02:05:19Z
audio: Piano Quintet in A, D.667 - "The Trout": 5. Finale (Allegro giusto)
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Mendelssohn: Octet, Op. 2 & 4 Pieces for String Quartet, Op. 81 (2023 Remastered Version)
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date published: 1977-11-01

Dvorák: Quintet No. 2 in A Major, Op. 81
type: MusicAlbum
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  by artist: Cleveland Quartet
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  genre: classical
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  additional property: OTSVerificationAPI
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  additional property: OTSTimestamp
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  additional property: OTSVerifyInstructions
    type: PropertyValue
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T23:30:38Z
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track: Piano Quintet in A Major, Op. 81: II. Dumka: Andante con moto
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  additional property: OTSVerificationAPI
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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 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: Piano Quintet in A Major, Op. 81: III. Scherzo - Furiant: Molto vivace
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  subject of: OpenTimestamps Proof of Existence
  audio: Piano Quintet in A Major, Op. 81: III. Scherzo - Furiant: Molto vivace

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OTSBitcoinBlock
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OTSBitcoinBlockVerifyURL
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OTSVerificationAPI
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OTSTimestamp
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OTSVerifyInstructions
type: PropertyValue
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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfea77cc202a4a2939cbd0e67586ccf3f1773978f8546ba619fa307c2d9780e9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11707564.
date published: 2026-07-31T15:59:18Z

Piano Quintet in A Major, Op. 81: III. Scherzo - Furiant: Molto vivace
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Barber: String Quartet, Op. 11 - Ives: String Quartet No. 2 & Scherzo (2023 Remastered Version)
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track: String Quartet in B Minor, Op. 11: I. Molto allegro e appassionato
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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 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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    date published: 2026-07-30T14:36:16Z
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Haydn: String Quartet in D Major "The Lark" & String Quartet in D Minor "Fifths"
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date published: 1976

Schubert: Octet for Strings and Winds in F Major, D. 803 (2023 Remastered Version)
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date published: 1975

Schubert: String Quartet No. 14, D. 810 - Mozart: Adagio and Fugue in C Minor, K. 546 (2023 Remastered Version)
type: MusicAlbum
date published: 1974-06-01

Brahms: The Complete String Quartets (2023 Remastered Version)
type: MusicAlbum
date published: 1973

Breathe: Relaxing Music from the Movies
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date published: 2006-07-18
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  by artist: Cincinnati Pops Orchestra
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    date published: 2026-07-08T03:20:19Z
  audio: Love Theme From "Spartacus"
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    additional property: Danceability
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Calm: Relaxing Music From the Movies
type: MusicAlbum
date published: 2023-08-21

Brahms: Quintet in B Minor for Clarinet and Strings, Op. 115
type: MusicAlbum
date published: 1976