Olga Samaroff
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description: Olga Samaroff (born Lucy Mary Agnes Hickenlooper; August 8, 1880May 17, 1948) was an American pianist, music critic, and teacher. Among her teachers was Charles-Valentin Alkan's son, Élie-Miriam Delab
popularity: 2
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  track: Samson Et Dalila: My Heart at Thy Sweet Voice - Welte-Mignon 2260
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  track: Impromptu No.2, Op. 31 in F Minor - Welte-Mignon 1481
album: Women of Piano. Great Female Pianists of the Golden Age, Vol. 2
album: Éphémères. Piano Music from the Golden Age
album: Masters of the Roll: Ossip Gabrilowitsch & Olga Samaroff
album: Classical SoundScapes For Film Vol, 24: Ossip Gabrilowitsch & Olga Samaroff
album: Classical SoundScapes For Film Vol, 3: Ossip Gabrilowitsch & Olga Samaroff
album: Piano Soundscapes, Vol. 7
album: Schmetterling. Piano Music by Chopin, Schumann and Legacy
album: Women of Piano. Great Female Pianists of the Golden Age
album: Women of Piano. Great Female Artists of the Golden Age
album: Spring. Beethoven, Grieg & Legacy
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album: Aeolian Murmurings. Piano Evocations from the Golden Age
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album: Women At The Piano - An Anthology Of Historic Performances, Vol. 2 (1926-1950)
album: Romanze. Heritage Chopin, Grieg & Tchaikovsky
album: Beethoven, Chopin & Others: Piano Works (2024 Remaster)
album: Sonderausgabe für Augustinermuseum Freiburg: Johannes Brahms, Vol. 2
album: "Souvenirs" - 20th Century Classical Piano Rolls
album: Edvard Grieg: The Piano Music in Historic Interpretations
album: Mirages. Hidden Treasures of Classical Piano (Extended Edition)
album: Bach, J.S.: Piano Transcriptions, Vol. 1 (Great Pianists) (1925-1947)
album: The World's Greatest Pianists, Volume Two
album: Welte-Mignon Piano Rolls, Vol. 3 (1905-1926)
album: Keyboard Giants of the Past
album: Éphémères. Piano Music from the Golden Age (Extended Edition)
album: Classical Masterworks: Classical Compositions of the 19th Century, Vol. 2

Impromptu No.2, Op. 31 in F Minor - Welte-Mignon 1481
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Romance Without Words In A Flat Minor, Op. 17 No. 3
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audio: Romance Without Words In A Flat Minor, Op. 17 No. 3
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Women of Piano. Great Female Pianists of the Golden Age, Vol. 2
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track: Landler (Tirolese) - Duo-Art 6110
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track: Chaconne in G Major HWV 435 - Welte-Mignon 1106
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Pieces, Op. 2: No. 1, Etude in C-Sharp Minor - Duo-Art 7325
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Éphémères. Piano Music from the Golden Age
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Masters of the Roll: Ossip Gabrilowitsch & Olga Samaroff
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Classical SoundScapes For Film Vol, 24: Ossip Gabrilowitsch & Olga Samaroff
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Classical SoundScapes For Film Vol, 3: Ossip Gabrilowitsch & Olga Samaroff
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Piano Soundscapes, Vol. 7
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Schmetterling. Piano Music by Chopin, Schumann and Legacy
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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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f94754439d5c0fc934c49eb4a5740588aecbaf3766451f571f44eb6ff6e7eb. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEPI82319203.
date published: 2026-07-08T03:39:04Z

Impromptu No. 1, Op. 29, A-Flat Major - Welte-Mignon 455
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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  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.289
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
  type: PropertyValue
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additional property: Valence (Positivity)
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  value: 0.185
additional property: Loudness (dB)
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additional property: Key Name
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additional property: Mode Name
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Women of Piano. Great Female Pianists of the Golden Age
type: MusicAlbum
date published: 2024-02-08

Women of Piano. Great Female Artists of the Golden Age
type: MusicAlbum
date published: 2024-08-18

Spring. Beethoven, Grieg & Legacy
type: MusicAlbum
date published: 2024-08-15

Zephrys. Piano Evocations from the Golden Age
type: MusicAlbum
date published: 2024-05-28
track: Murmuring Zephyrs. (Murmelndes Luftchen) Op. 21, No .4 - Duca 10
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  duration: PT3M17S
  duration ms: 197559
  explicit: false
  by artist: Adolf Jensen
  by artist: Peter Phillips
  by artist: Willy Rehberg
  in album: Zephrys. Piano Evocations from the Golden Age
    type: MusicAlbum
    date published: 2024-05-28
  popularity: 12
  genre: german-romanticism
  genre: late-romantic-era
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  additional property: CopyrightID
  additional property: CopyrightStatus
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  additional property: CopyrightRegisteredAt
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  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x9a3061be644efb34f9bf9dee3ce9a043e7fabeee864d704dcfa16b74e856d50c
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957124
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82416656
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:53:27Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3061be644efb34f9bf9dee3ce9a043e7fabeee864d704dcfa16b74e856d50c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEPI82416656.
    date published: 2026-07-08T03:53:27Z
  audio: Murmuring Zephyrs. (Murmelndes Luftchen) Op. 21, No .4 - Duca 10
    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
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
      type: PropertyValue
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
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    additional property: Instrumentalness
      type: PropertyValue
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    additional property: Liveness
      type: PropertyValue
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    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.04
    additional property: Loudness (dB)
      type: PropertyValue
      value: -28.649
    additional property: Key Name
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    additional property: Mode Name
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Aeolian Murmurings. Piano Evocations from the Golden Age
type: MusicAlbum
date published: 2024-08-20
track: Aeolian Murmurings. Op. 123 (Concert Study) - Duo-Art 5797
  type: MusicRecording
  duration: PT3M30S
  duration ms: 210630
  explicit: false
  by artist: Homer Newton Bartlett
  by artist: John Thompson
  by artist: Peter Phillips
  in album: Aeolian Murmurings. Piano Evocations from the Golden Age
    type: MusicAlbum
    date published: 2024-08-20
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  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
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  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x66898d701d6512f1b034df88e7919c12b4891ac6e629df3af690c5ab2e74b6ce
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957122
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957122
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82437454
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:39:04Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66898d701d6512f1b034df88e7919c12b4891ac6e629df3af690c5ab2e74b6ce. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEPI82437454.
    date published: 2026-07-08T03:39:04Z
  audio: Aeolian Murmurings. Op. 123 (Concert Study) - Duo-Art 5797
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 141.761
    additional property: Musical Key
      type: PropertyValue
      value: 6
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.257
    additional property: Energy
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    additional property: Speechiness
      type: PropertyValue
      value: 0.039
    additional property: Acousticness
      type: PropertyValue
      value: 0.986
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.917
    additional property: Liveness
      type: PropertyValue
      value: 0.207
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.101
    additional property: Loudness (dB)
      type: PropertyValue
      value: -22.09
    additional property: Key Name
      type: PropertyValue
      value: F#
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Valse Sentimentale. Op. 51, No. 6 - Welte-Mignon 1679
  type: MusicRecording
  duration: PT3M52S
  duration ms: 232890
  explicit: false
  by artist: Pyotr Ilyich Tchaikovsky
  by artist: Vera Margolies
  by artist: Peter Phillips
  in album: Aeolian Murmurings. Piano Evocations from the Golden Age
    type: MusicAlbum
    date published: 2024-08-20
  isrc code: DEPI82437471
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-05T04:30:28+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xa13ed5e7ba2d57f5fc657133dfdb9e4faeec079aec01c242f82ff5cd3a34d8a2
  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/DEPI82437471
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13ed5e7ba2d57f5fc657133dfdb9e4faeec079aec01c242f82ff5cd3a34d8a2. 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/DEPI82437471.
    date published: 2026-07-08T03:20:19Z
  audio: Valse Sentimentale. Op. 51, No. 6 - Welte-Mignon 1679
    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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      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.341
    additional property: Energy
      type: PropertyValue
      value: 0.031
    additional property: Speechiness
      type: PropertyValue
      value: 0.041
    additional property: Acousticness
      type: PropertyValue
      value: 0.994
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.889
    additional property: Liveness
      type: PropertyValue
      value: 0.243
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.078
    additional property: Loudness (dB)
      type: PropertyValue
      value: -30.743
    additional property: Key Name
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    additional property: Mode Name
      type: PropertyValue
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track: Waltz, Op. 39, No. 15 A-Flat Major - Duo-Art 5642.
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  duration: PT1M8S
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  explicit: false
  by artist: Johannes Brahms
  by artist: Alexander Raab
  by artist: Peter Phillips
  in album: Aeolian Murmurings. Piano Evocations from the Golden Age
    type: MusicAlbum
    date published: 2024-08-20
  genre: classical
  genre: german-romanticism
  genre: late-romantic-era
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  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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    value: https://explorer.copyrightchains.com/tx/0x5287b36958eeeb6ac795948c90f08735dabc983e319bcd4ff56bf3e28ccc569d
  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: Waltz, Op. 39, No. 15 A-Flat Major - Duo-Art 5642.
track: Valse Nonchalante. Op. 110 in D-Flat Major - Duo-Art 5831

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 957145

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957145

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82437912

OTSTimestamp
type: PropertyValue
value: 2026-07-08T08:56:20Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5287b36958eeeb6ac795948c90f08735dabc983e319bcd4ff56bf3e28ccc569d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEPI82437912.
date published: 2026-07-08T08:56:20Z

Waltz, Op. 39, No. 15 A-Flat Major - Duo-Art 5642.
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
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.444
additional property: Energy
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  value: 0.045
additional property: Speechiness
  type: PropertyValue
  value: 0.039
additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
  type: PropertyValue
  value: 0.107
additional property: Valence (Positivity)
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  value: 0.263
additional property: Loudness (dB)
  type: PropertyValue
  value: -27.411
additional property: Key Name
  type: PropertyValue
  value: Ab
additional property: Mode Name
  type: PropertyValue
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Valse Nonchalante. Op. 110 in D-Flat Major - Duo-Art 5831
type: MusicRecording
duration: PT3M20S
duration ms: 200756
explicit: false
by artist: Camille Saint-Saëns
by artist: Peter Phillips
in album: Aeolian Murmurings. Piano Evocations from the Golden Age
  type: MusicAlbum
  date published: 2024-08-20
genre: classical
genre: late-romantic-era
genre: french-romanticism
isrc code: DEPI82437489
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
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957124
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82437489
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:53:27Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc509edc85d1204a263e37fb8bdd3086e55a41579fc25e522057afabf8bde87e7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEPI82437489.
  date published: 2026-07-08T03:53:27Z
audio: Valse Nonchalante. Op. 110 in D-Flat Major - Duo-Art 5831
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
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  additional property: Musical Key
    type: PropertyValue
    value: 1
  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.298
  additional property: Energy
    type: PropertyValue
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
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    value: 0.952
  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -32.922
  additional property: Key Name
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Wanderer. Schubert & Beethoven from the Golden Age
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date published: 2024-08-09

Women At The Piano - An Anthology Of Historic Performances, Vol. 2 (1926-1950)
type: MusicAlbum
date published: 2006-07-25

Romanze. Heritage Chopin, Grieg & Tchaikovsky
type: MusicAlbum
date published: 2024-05-22
track: The Seasons, Op. 37a: No. 6, Barcarolle (June) - Duo-Art 7128
  type: MusicRecording
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  duration ms: 265403
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  by artist: Peter Phillips
  by artist: Nadia Reisenberg
  in album: Romanze. Heritage Chopin, Grieg & Tchaikovsky
    type: MusicAlbum
    date published: 2024-05-22
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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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    value: 957124
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957124
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82308084
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:53:27Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e3b3d7cf60e3a783c932f712abcae54a55011efee22c1c77f737f9516e1d9c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEPI82308084.
    date published: 2026-07-08T03:53:27Z
  audio: The Seasons, Op. 37a: No. 6, Barcarolle (June) - Duo-Art 7128
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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
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
      type: PropertyValue
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
      type: PropertyValue
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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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Sonderausgabe für Augustinermuseum Freiburg: Johannes Brahms, Vol. 2
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"Souvenirs" - 20th Century Classical Piano Rolls
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Edvard Grieg: The Piano Music in Historic Interpretations
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Bach, J.S.: Piano Transcriptions, Vol. 1 (Great Pianists) (1925-1947)
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The World's Greatest Pianists, Volume Two
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Welte-Mignon Piano Rolls, Vol. 3 (1905-1926)
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Keyboard Giants of the Past
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Éphémères. Piano Music from the Golden Age (Extended Edition)
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Classical Masterworks: Classical Compositions of the 19th Century, Vol. 2
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