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genre: opera
description: Elisabeth Rethberg ( Lisbeth Sättler; 22 September 1894 – 6 June 1976) was a German operatic spinto soprano singer who was active from the period of the First World War through the early 1940s. After
popularity: 2
followers: 531
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subject of: OpenTimestamps Proof of Existence
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album: Bizet: Carmen, WD 31 (Sung in German) [Live]
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album: Vocal Recital: Gigli, Beniamino - Verdi, G. / Massenet, J. / Puccini, G. / Bizet, G. (Complete Collection of Opera Highlights, Vol. 3) (1930-1941)
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  date published: 1999-01-01
album: Lauri-Volpi Sings Verdi
  type: MusicAlbum
  date published: 1993-01-01
album: Strauss II: The Gypsy Baron
  type: MusicAlbum
  date published: 2009-03-31
album: Lebendige Vergangenheit - Giuseppe de Luca (Vol.2)
  type: MusicAlbum
  date published: 1999
album: Otello
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album: Verdi: Otello (Martinelli, Rethberg, Panizza)(1938)
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album: Johann Strauss II: Die Fledermaus
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album: Gold Masters: Richard Tauber, Vol. 7
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album: Grosse Mozartsänger (Live)
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  date published: 1942-01-01
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      date published: 2026-07-08T03:20:19Z
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album: Opera Arias (Tenor): Gigli, Beniamino (The Very Best of Beniamino Gigli) (1927-1946)
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album: Carl Loewe zu Ehren - Aufnahmen von 1902 - 1970
album: Simon Boccanegra
album: Opera! The French School
album: Mozart: Don Giovanni, K. 527
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album: VERDI: SIMON BOCCANEGRA
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album: Christmas Ave Maria
album: Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
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album: The Golden Age of Singing, Vol. 3
album: Lebendige Vergangenheit - Friedrich Schorr
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album: Four Famous German Sopranos
album: Lebendige Vergangenheit - Elisabeth Rethberg
album: Verdi & Mozart & Wagner: Great Voices of the Century - Sopranos Vol. 4
album: Elisabeth Rethberg Soprano
album: Elisabeth Rethberg (Recorded 1924 - 1930)
album: Ezio Pinza (Recorded 1923 - 1930)
album: Hugo Wolf
album: Great Singers Vol. 2 (Recorded 1903-1939)
album: Der junge Richard Tauber - Arien und Duette
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album: Hugo Wolf: 1931 - 1938 Recordings, Vol. 2
album: Le Nozze di Figaro: Pinza, Rethberg, Sayao, Novotna live 1940 (Live)
album: Return Victorious!
album: My Native Land

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OpenTimestamps Proof of Existence
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date published: 2026-07-31T04:14:58Z

Lucia di Lammermoor: Act III: Tu che a Dio spiegasti l'ali
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T14:36:16Z
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Carl Loewe zu Ehren - Aufnahmen von 1902 - 1970
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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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Simon Boccanegra
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Opera! The French School
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Mozart: Don Giovanni, K. 527
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Don Giovanni
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VERDI: SIMON BOCCANEGRA
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MOZART: LE NOZZE DI FIGARO
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Christmas Ave Maria
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Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
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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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba55a80ba688fae45c8bc1ca8b90815a517735f75098a3bb8d125de853f2950b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1004488 — a six-check JSON result.
    date published: 2026-07-31T12:24:41Z
  audio: L'elisir d'amore (the Elixir of Love), Act I: Quanto e bella, quanto e cara!
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 126.866
    additional property: Musical Key
      type: PropertyValue
      value: 0
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.421
    additional property: Energy
      type: PropertyValue
      value: 0.149
    additional property: Speechiness
      type: PropertyValue
      value: 0.042
    additional property: Acousticness
      type: PropertyValue
      value: 0.977
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.295
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.298
    additional property: Loudness (dB)
      type: PropertyValue
      value: -13.663
    additional property: Key Name
      type: PropertyValue
      value: C
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Lucia di Lammermoor, Act III: Tombe degli avi miei … Fra poco a me ricovero
  type: MusicRecording
  duration: PT1M41S
  duration ms: 101840
  explicit: false
  by artist: Gaetano Donizetti
  by artist: Beniamino Gigli
  by artist: Rosario Bourdon
  in album: Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
    type: MusicAlbum
    date published: 1997-01-01
  genre: opera
  isrc code: FRZ140301010
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-31T11:12:54+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xc26f2072561b5e07d49371ec88aa6a050eb0db5a85dd2776194987df7a602883
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960397
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960397
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140301010
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T12:24:41Z
  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 0xc26f2072561b5e07d49371ec88aa6a050eb0db5a85dd2776194987df7a602883. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140301010 — a six-check JSON result.
    date published: 2026-07-31T12:24:41Z
  audio: Lucia di Lammermoor, Act III: Tombe degli avi miei … Fra poco a me ricovero
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 96.979
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.326
    additional property: Energy
      type: PropertyValue
      value: 0.018
    additional property: Speechiness
      type: PropertyValue
      value: 0.04
    additional property: Acousticness
      type: PropertyValue
      value: 0.994
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.913
    additional property: Liveness
      type: PropertyValue
      value: 0.08
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.042
    additional property: Loudness (dB)
      type: PropertyValue
      value: -35.12
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Lucia di Lammermoor, Act II: Chi mi frena in tal momento
  type: MusicRecording
  duration: PT4M45S
  duration ms: 285480
  explicit: false
  by artist: Gaetano Donizetti
  by artist: Beniamino Gigli
  by artist: Amelita Galli-Curci
  by artist: Louise Homer
  by artist: Angelo Badà
  by artist: Giuseppe De Luca
  by artist: Ezio Pinza
  by artist: Giulio Setti
  in album: Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
    type: MusicAlbum
    date published: 1997-01-01
  genre: opera
  isrc code: FRZ140713050
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  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: Lucia di Lammermoor, Act II: Chi mi frena in tal momento
track: La forza del destino, Act III: Solenne in quest ora
track: Martha, Act III: Ach so fromm (M'appari tutt'amor)

CopyrightChainExplorerURL
type: PropertyValue
value: https://explorer.copyrightchains.com/tx/0x62d3e11b01e930c1a824fe12a98d70afca8b77c5d5a254ca2c37ec4e0b6c77e8

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 960150

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/960150

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140713050

OTSTimestamp
type: PropertyValue
value: 2026-07-29T21:51:49Z

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 0x62d3e11b01e930c1a824fe12a98d70afca8b77c5d5a254ca2c37ec4e0b6c77e8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140713050 — a six-check JSON result.
date published: 2026-07-29T21:51:49Z

Lucia di Lammermoor, Act II: Chi mi frena in tal momento
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 93.912
additional property: Musical Key
  type: PropertyValue
  value: 7
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.444
additional property: Energy
  type: PropertyValue
  value: 0.065
additional property: Speechiness
  type: PropertyValue
  value: 0.043
additional property: Acousticness
  type: PropertyValue
  value: 0.995
additional property: Instrumentalness
  type: PropertyValue
  value: 0.897
additional property: Liveness
  type: PropertyValue
  value: 0.122
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.228
additional property: Loudness (dB)
  type: PropertyValue
  value: -29.75
additional property: Key Name
  type: PropertyValue
  value: G
additional property: Mode Name
  type: PropertyValue
  value: Minor

La forza del destino, Act III: Solenne in quest ora
type: MusicRecording
duration: PT5M42S
duration ms: 342680
explicit: false
by artist: Giuseppe Verdi
by artist: Beniamino Gigli
by artist: Titta Ruffo
by artist: Rosario Bourdon
in album: Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
  type: MusicAlbum
  date published: 1997-01-01
genre: classical
genre: opera
isrc code: FRZ140301170
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-08T11:25:33+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe1214d038f622e73c33bb9e3057c45dd9797fac17727997388c10ea36d89346d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953520
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953520
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140301170
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T13:32:09Z
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 0xe1214d038f622e73c33bb9e3057c45dd9797fac17727997388c10ea36d89346d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140301170 — a six-check JSON result.
  date published: 2026-06-13T13:32:09Z
audio: La forza del destino, Act III: Solenne in quest ora
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 92.325
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.28
  additional property: Energy
    type: PropertyValue
    value: 0.004
  additional property: Speechiness
    type: PropertyValue
    value: 0.056
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.936
  additional property: Liveness
    type: PropertyValue
    value: 0.065
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.151
  additional property: Loudness (dB)
    type: PropertyValue
    value: -34.777
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Martha, Act III: Ach so fromm (M'appari tutt'amor)
type: MusicRecording
duration: PT6M36S
duration ms: 396240
explicit: false
by artist: Friedrich von Flotow
by artist: Beniamino Gigli
by artist: Bruno Reibold
in album: Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
  type: MusicAlbum
  date published: 1997-01-01
isrc code: FRZ140714040
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T09:26:39+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfec6c3a9a53e0fea8ac81981382a201cbc366f872984914f8b32e785bdd4453c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957048
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957048
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140714040
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T14:18:56Z
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 0xfec6c3a9a53e0fea8ac81981382a201cbc366f872984914f8b32e785bdd4453c. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140714040 — a six-check JSON result.
  date published: 2026-07-07T14:18:56Z
audio: Martha, Act III: Ach so fromm (M'appari tutt'amor)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 91.596
  additional property: Musical Key
    type: PropertyValue
    value: 8
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.357
  additional property: Energy
    type: PropertyValue
    value: 0.056
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.988
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.898
  additional property: Liveness
    type: PropertyValue
    value: 0.119
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.057
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.048
  additional property: Key Name
    type: PropertyValue
    value: Ab
  additional property: Mode Name
    type: PropertyValue
    value: Major

Lebendige Vergangenheit - Giacomo Lauri Volpi
type: MusicAlbum
date published: 2006-09-14
track: A te, o cara, amor talora (I Puritani)
  type: MusicRecording
  duration: PT3M36S
  duration ms: 216506
  explicit: false
  by artist: Giacomo Lauri - Volpi
  in album: Lebendige Vergangenheit - Giacomo Lauri Volpi
    type: MusicAlbum
    date published: 2006-09-14
  isrc code: ATP138801202
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T14:34:49+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xcc55788a57aa8b17ebe9941ea67cbf549579bd35ac27fde8693e8e6ae1d87527
  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/ATP138801202
  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 0xcc55788a57aa8b17ebe9941ea67cbf549579bd35ac27fde8693e8e6ae1d87527. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATP138801202 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
  audio: A te, o cara, amor talora (I Puritani)
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 115.032
    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: 0.241
    additional property: Energy
      type: PropertyValue
      value: 0.122
    additional property: Speechiness
      type: PropertyValue
      value: 0.034
    additional property: Acousticness
      type: PropertyValue
      value: 0.986
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.159
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.106
    additional property: Loudness (dB)
      type: PropertyValue
      value: -16.188
    additional property: Key Name
      type: PropertyValue
      value: C#
    additional property: Mode Name
      type: PropertyValue
      value: Major

The Golden Age of Singing, Vol. 3
type: MusicAlbum
date published: 2001-01-01

Lebendige Vergangenheit - Friedrich Schorr
type: MusicAlbum
date published: 2006-08-19

Missa Solemnis conducted by Arturo Toscanini
type: MusicAlbum
date published: 2010

Lebendige Vergangenheit - Ezio Pinza (Vol. 2)
type: MusicAlbum
date published: 2006-09-07
track: Non più andrai (Le nozze di Figaro)
  type: MusicRecording
  duration: PT4M3S
  duration ms: 243973
  explicit: false
  by artist: Ezio Pinza
  in album: Lebendige Vergangenheit - Ezio Pinza (Vol. 2)
    type: MusicAlbum
    date published: 2006-09-07
  genre: opera
  genre: requiem
  isrc code: ATP139408520
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T15:01:13+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x1835ae51af26e93a14fa9101cab1485b63f87f5d4cd259dcaf9b936fd685ac45
  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/ATP139408520
  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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Mozart: Don Giovanni
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1920's Opera Legend
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Great Opera Singers / Elisabeth Rethberg Sings Verdi / Recordings 1921 - 1934
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„Fin de siècle" - Vocal Music by Grieg, Wolf, Wagner, Debussy -Vol.2
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Four Famous German Sopranos
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Lebendige Vergangenheit - Elisabeth Rethberg
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Verdi & Mozart & Wagner: Great Voices of the Century - Sopranos Vol. 4
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Elisabeth Rethberg Soprano
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Elisabeth Rethberg (Recorded 1924 - 1930)
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Ezio Pinza (Recorded 1923 - 1930)
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Hugo Wolf
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Great Singers Vol. 2 (Recorded 1903-1939)
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Der junge Richard Tauber - Arien und Duette
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Gounod: Historische Lied Edition
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Hugo Wolf: 1931 - 1938 Recordings, Vol. 2
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Le Nozze di Figaro: Pinza, Rethberg, Sayao, Novotna live 1940 (Live)
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date published: 1940-03-09

Return Victorious!
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date published: 1928-10-10

My Native Land
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date published: 1927-12-20