Martinů Quartet
type: MusicGroup
genre: chamber music
genre: classical
description: The Martinů Quartet () is a Czech string quartet ensemble founded in 1976, originally under the name Havlák Quartet by students of Professor Viktor Moučka at the Prague Conservatory. In 1985, with the
popularity: 24
followers: 306
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xaa7ffcf98d3f1e5f31ea8eb01d35e55dd99e922ff7fd7b8c6e4873ce83d71289
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9ccef2e-c654-4720-af60-ff570afdf7b3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9ccef2e-c654-4720-af60-ff570afdf7b3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e9ccef2e-c654-4720-af60-ff570afdf7b3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xaa7ffcf98d3f1e5f31ea8eb01d35e55dd99e922ff7fd7b8c6e4873ce83d71289","name":"Martinů Quartet","registered_at":"2026-06-12T12:40:03Z","symbol":"NIM0300561","token_address":"0x2183c8cc15c1c2c266091a28fd225a4ea78ae420","type":"artist","uuid":"e9ccef2e-c654-4720-af60-ff570afdf7b3"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7ffcf98d3f1e5f31ea8eb01d35e55dd99e922ff7fd7b8c6e4873ce83d71289. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9ccef2e-c654-4720-af60-ff570afdf7b3.json and https://artists.proofprofile.net/proofs/artist/e9ccef2e-c654-4720-af60-ff570afdf7b3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0xaa7ffcf98d3f1e5f31ea8eb01d35e55dd99e922ff7fd7b8c6e4873ce83d71289","name":"Martinů Quartet","registered_at":"2026-06-12T12:40:03Z","symbol":"NIM0300561","token_address":"0x2183c8cc15c1c2c266091a28fd225a4ea78ae420","type":"artist","uuid":"e9ccef2e-c654-4720-af60-ff570afdf7b3"}
album: Feld: Chamber Music for Flute, Vol. 1
  type: MusicAlbum
  date published: 2012-09-01
album: Kalabis: String Quartets
  type: MusicAlbum
  date published: 1996-01-01
album: Kalabis, Lucký Svatoš: Week of New Production 1986
  type: MusicAlbum
  date published: 2013-02-10
album: Eben: String Quartet "Labyrinth of the World and Paradise of the Heart", Piano Trio and Piano Quintet
  type: MusicAlbum
  date published: 2017-08-18
album: Harp Recital - Ravel, Debussy, Jolivet, Tournier
  type: MusicAlbum
  date published: 1995-01-01
album: Gregory Hutter: Chamber Works
  type: MusicAlbum
  date published: 2024-09-27
album: David Post: Concertino á cinque & Piano Quintet
  type: MusicAlbum
  date published: 2023-02-03
album: Beneš: The Complete String Quartets
  type: MusicAlbum
  date published: 2022-10-14
album: Solo for Harp: Lydie Härtelová
  type: MusicAlbum
  date published: 2018-11-22
album: Elliott Miles McKinley: Infinite Landscapes
  type: MusicAlbum
  date published: 2016-05-13
album: Taneyev: The Complete Quintets
  type: MusicAlbum
  date published: 2015-01-23
album: Mozart: Clarinet Quintet - Beethoven: String Quartet, "Harp"
  type: MusicAlbum
  date published: 2013-03-26
album: Janacek: String Quartets
  type: MusicAlbum
  date published: 2012-09-01
album: Dvořák: String Quartets Opp. 105 and 106
  type: MusicAlbum
  date published: 2012-09-01
album: Bodorova - Stevenson: String Quartets
  type: MusicAlbum
  date published: 2012-09-01
album: McKinley: String Quartets
  type: MusicAlbum
  date published: 2011-07-05
album: Martinu: Piano Quintets Nos. 1 & 2 / Sonata for 2 Violins and Piano
  type: MusicAlbum
  date published: 2007-04-24
album: Martinu, B.: String Quartets Nos. 4, 5 and 7
  type: MusicAlbum
  date published: 2003-01-18
album: Martinu: String Quartets Nos. 3 and 6
  type: MusicAlbum
  date published: 2002-11-01
album: Martinu: String Quartets Nos. 1 and 2 / Three Horsemen
  type: MusicAlbum
  date published: 2000-05-18
album: Mysliveček, Richter, Krommer-Kramář, Vranický: String Quartets
  type: MusicAlbum
  date published: 1996-01-01
album: Mysliveček, Richter, Krommer, Ryba: String Quartets
  type: MusicAlbum
  date published: 1992-01-01
album: String Quartet No. 1
  type: MusicAlbum
  date published: 2022-10-03
album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
  track: Quartet No. 12 in F Major Op. 96 "American" I. Allegro Non Troppo
    type: MusicRecording
    duration: PT7M40S
    duration ms: 460514
    explicit: false
    by artist: Antonín Dvořák
    by artist: Wihan Quartet
    in album: Dvorak: Two Quartets
      type: MusicAlbum
      date published: 2010-01-18
    genre: classical
    genre: late-romantic-era
    genre: czech-classical
    isrc code: QMQL91200034
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-31T08:10:21+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x32c4bd64d6fc49164990e268b1acb4cb0e5dcf5812a5463790c3710eec791519
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960368
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960368
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200034
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T08:26:41Z
    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 0x32c4bd64d6fc49164990e268b1acb4cb0e5dcf5812a5463790c3710eec791519. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QMQL91200034.
      date published: 2026-07-31T08:26:41Z
    audio: Quartet No. 12 in F Major Op. 96 "American" I. Allegro Non Troppo
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 119.684
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.242
      additional property: Energy
        type: PropertyValue
        value: 0.229
      additional property: Speechiness
        type: PropertyValue
        value: 0.035
      additional property: Acousticness
        type: PropertyValue
        value: 0.912
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.681
      additional property: Liveness
        type: PropertyValue
        value: 0.143
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.153
      additional property: Loudness (dB)
        type: PropertyValue
        value: -16.955
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: Quartet No. 12 in F Major Op. 96 "American" II. Lento
  track: Quartet No. 12 in F Major Op. 96 "American" III. Molto Vivace
  track: Quartet No. 12 in F Major Op. 96 "American" IV.
  track: Quartet No. 14 in A Flat Major Op. 105 II. Molto Vivace
  track: Quartet No. 14 in A Flat Major Op. 105 III. Lento Cantabile
album: Řezáč: Squaring The Heart - Teml: Fantasy for Violin, Harp and Orchestra
album: Bartoň, Graham, Havelka, Kopelent, Matějů, Pokorný: Czech Contemporary Clarinet Music
album: Relaxing With String Quartet
album: Francaix, Bordes, d'Indy, Pierne & Jolivet
album: Nancy Van de Vate, Vol. 3

Quartet No. 12 in F Major Op. 96 "American" II. Lento
type: MusicRecording
duration: PT7M52S
duration ms: 472806
explicit: false
by artist: Antonín Dvořák
by artist: Wihan Quartet
by artist: Martinů Quartet
in album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: QMQL91200035
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-06T19:18:29+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0f6d361f1514447cb52f820c1d27c3a1f1440bf3215dd0a48b7b25b0f48340e8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953515
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953515
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200035
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:53:06Z
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 0x0f6d361f1514447cb52f820c1d27c3a1f1440bf3215dd0a48b7b25b0f48340e8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMQL91200035.
  date published: 2026-06-13T12:53:06Z
audio: Quartet No. 12 in F Major Op. 96 "American" II. Lento
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 105.623
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.138
  additional property: Energy
    type: PropertyValue
    value: 0.252
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.896
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.059
  additional property: Liveness
    type: PropertyValue
    value: 0.122
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.107
  additional property: Loudness (dB)
    type: PropertyValue
    value: -17.695
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Quartet No. 12 in F Major Op. 96 "American" III. Molto Vivace
type: MusicRecording
duration: PT4M14S
duration ms: 254213
explicit: false
by artist: Antonín Dvořák
by artist: Wihan Quartet
in album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: QMQL91200036
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-07T03:36:04+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6967b2aa5c70238e01b0a46a24cfabf3325bdd96282a89b0014c98581cb4b64f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953515
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953515
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200036
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:53:06Z
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 0x6967b2aa5c70238e01b0a46a24cfabf3325bdd96282a89b0014c98581cb4b64f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMQL91200036.
  date published: 2026-06-13T12:53:06Z
audio: Quartet No. 12 in F Major Op. 96 "American" III. Molto Vivace
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 119.507
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.353
  additional property: Energy
    type: PropertyValue
    value: 0.236
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.895
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.184
  additional property: Liveness
    type: PropertyValue
    value: 0.1
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.498
  additional property: Loudness (dB)
    type: PropertyValue
    value: -16.587
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

Quartet No. 12 in F Major Op. 96 "American" IV.
type: MusicRecording
duration: PT5M47S
duration ms: 347360
explicit: false
by artist: Antonín Dvořák
by artist: Wihan Quartet
in album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: QMQL91200037
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T21:34:24+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa8fabcbeb8e8b06aa2a69c497688d014da5da30e236d367f6f967118e476ae8d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960481
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960481
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200037
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:51:35Z
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 0xa8fabcbeb8e8b06aa2a69c497688d014da5da30e236d367f6f967118e476ae8d. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMQL91200037.
  date published: 2026-07-31T23:51:35Z
audio: Quartet No. 12 in F Major Op. 96 "American" IV.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 102.741
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.261
  additional property: Energy
    type: PropertyValue
    value: 0.212
  additional property: Speechiness
    type: PropertyValue
    value: 0.035
  additional property: Acousticness
    type: PropertyValue
    value: 0.891
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.597
  additional property: Liveness
    type: PropertyValue
    value: 0.127
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.261
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.122
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

Quartet No. 14 in A Flat Major Op. 105 II. Molto Vivace
type: MusicRecording
duration: PT6M21S
duration ms: 381781
explicit: false
by artist: Antonín Dvořák
by artist: Martinů Quartet
in album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: QMQL91200039
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-07T03:34:35+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x62aabeccf5802bde7a4ba7a6c04c508460638300b49c91711ea20045543811d0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953515
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953515
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200039
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:53:06Z
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 0x62aabeccf5802bde7a4ba7a6c04c508460638300b49c91711ea20045543811d0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMQL91200039.
  date published: 2026-06-13T12:53:06Z
audio: Quartet No. 14 in A Flat Major Op. 105 II. Molto Vivace
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 130.118
  additional property: Musical Key
    type: PropertyValue
    value: 1
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.293
  additional property: Energy
    type: PropertyValue
    value: 0.186
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.882
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.041
  additional property: Liveness
    type: PropertyValue
    value: 0.198
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.202
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.714
  additional property: Key Name
    type: PropertyValue
    value: C#
  additional property: Mode Name
    type: PropertyValue
    value: Major

Quartet No. 14 in A Flat Major Op. 105 III. Lento Cantabile
type: MusicRecording
duration: PT8M17S
duration ms: 497996
explicit: false
by artist: Antonín Dvořák
by artist: Martinů Quartet
in album: Dvorak: Two Quartets
  type: MusicAlbum
  date published: 2010-01-18
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: QMQL91200040
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-07T03:33:45+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x23aa8c2640054e5492fd969fd48c37c6c409fb9ca779fccb624b3a0bafd66e1f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953515
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953515
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMQL91200040
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:53:06Z
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 0x23aa8c2640054e5492fd969fd48c37c6c409fb9ca779fccb624b3a0bafd66e1f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMQL91200040.
  date published: 2026-06-13T12:53:06Z
audio: Quartet No. 14 in A Flat Major Op. 105 III. Lento Cantabile
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 111.266
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.115
  additional property: Energy
    type: PropertyValue
    value: 0.168
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.887
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.414
  additional property: Liveness
    type: PropertyValue
    value: 0.106
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.039
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.671
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

Řezáč: Squaring The Heart - Teml: Fantasy for Violin, Harp and Orchestra
type: MusicAlbum
date published: 2017-12-22

Bartoň, Graham, Havelka, Kopelent, Matějů, Pokorný: Czech Contemporary Clarinet Music
type: MusicAlbum
date published: 1995-01-01
track: Different Geometry for Solo Clarinet
  type: MusicRecording
  duration: PT2M50S
  duration ms: 170960
  explicit: false
  by artist: Peter Graham
  by artist: Kamil Doležal
  in album: Bartoň, Graham, Havelka, Kopelent, Matějů, Pokorný: Czech Contemporary Clarinet Music
    type: MusicAlbum
    date published: 1995-01-01
  isrc code: CZA169500409
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T18:26:00+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x4cd9b062fe29e15be329c7df2233b43b95943880636397f6b7f491ac82404693
  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/CZA169500409
  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 0x4cd9b062fe29e15be329c7df2233b43b95943880636397f6b7f491ac82404693. 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/CZA169500409.
    date published: 2026-07-08T03:20:19Z
  audio: Different Geometry for Solo Clarinet
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 160.894
    additional property: Musical Key
      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.508
    additional property: Energy
      type: PropertyValue
      value: 0.02
    additional property: Speechiness
      type: PropertyValue
      value: 0.19
    additional property: Acousticness
      type: PropertyValue
      value: 0.99
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.687
    additional property: Liveness
      type: PropertyValue
      value: 0.114
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.415
    additional property: Loudness (dB)
      type: PropertyValue
      value: -27.396
    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
      type: PropertyValue
      value: Minor

Relaxing With String Quartet
type: MusicAlbum
date published: 2020-11-16

Francaix, Bordes, d'Indy, Pierne & Jolivet
type: MusicAlbum
date published: 2012-09-01

Nancy Van de Vate, Vol. 3
type: MusicAlbum
date published: 2011-11-01