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genre: opera
description: Boris Christoff (, ; 18 May 1914 – 28 June 1993) was a Bulgarian opera singer, widely considered one of the greatest basses of the 20th century. Early life thumb|left|Boris Christoff (photo with 19
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  track: Mussorgsky: Boris Godunov, Prologue: Shchelkalov's Adress. "Pravoslavnye! Ne umolim boyarin" (Shchelkalov)
  track: Mussorgsky: Boris Godunov, Prologue, Coronation Scene: "Da zdrastvuet tsar' Boris Fedorovich!" (Shuysky, Chorus)
  track: Mussorgsky: Boris Godunov, Act 1: Pimen's Monologue. "Eshche odno poslednee skazan's" (Pimen)
  track: Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Bozhe krepkiy pravyi" (Chorus, Grigoriy, Pimen)
  track: Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Ty vse pisal i snom ne pozabylsa" (Grigoriy, Pimen)
  track: Mussorgsky: Boris Godunov, Act 1: "Zvonyat k zautreni" (Chorus, Grigoriy, Pimen)
  track: Mussorgsky: Boris Godunov, Act 1: "Kak edet en" (Varlaam, Grigoriy, The Hostess)
  track: Mussorgsky: Boris Godunov, Act 4: Council of Boyars. "Chto zh, poydem na golosa, boyare" (Chorus)
  track: Mussorgsky: Boris Godunov, Act 1: Boris' Crime. "Davno, chestnoy otets" (Grigoriy, Pimen)
  track: Mussorgsky: Boris Godunov, Act 1: Song of the Hostess. "Poymala ya siza seleznya" (The Hostess, Varlaam, Misail)
  track: Mussorgsky: Boris Godunov, Act 1: "Zheno, mir domu tvoemu!" (Varlaam, Misail, The Hostess, Grigoriy)
  track: Mussorgsky: Boris Godunov, Act 1: Drinking Song. "Kak vo gorode bylo vo Kazani" (Varlaam, Grigoriy, Misail)
  track: Mussorgsky: Boris Godunov, Act 2: Clock Scene. "Uf, tyazhelo!" (Boris)
album: Verdi: Ernani (Recorded 1957) [Live]
album: Verdi: Don Carlos (Recorded 1961)
album: Tchaikovsky: Mazeppa (Sung in Italian) [Recorded Live 1954]
album: Verdi: Don Carlo
album: Meyerbeer: Roberto le Diable (Live)
album: Die Meistersinger von Nürnberg sung in Italian
album: Les plus belles musiques du monde : Splendeurs du chant russe, Vol. 1
album: Wagner: Die Meistersinger von Nurnberg, WWV 96 (Sung in Italian)
album: Mussorgsky: Khovanshchina (Sung in Italian) (Live)
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album: Mussorgsky: The Complete Songs
album: Verdi: Simon Boccanegra
album: Verdi: Don Carlos (Live Recordings 1958)
album: Glinka: A Life for the Tsar (Arr. N. Rimsky-Korsakov)
album: Verdi: Aida (Excerpts)
album: Icon: Boris Christoff
album: Mikhail Glinka : Songs (1959)
album: Lebendige Vergangeneit - Boris Christoff (Vol. 4)
album: Claudio Monteverdi, L'Incoronazione Di Poppea
album: Gounod: Faust
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album: Verdi: Ernani
album: Edition Herbert von Karajan, Vol. II (Verdi: Messa di Requiem)
album: Boris Christoff - Arias form Russian Classical Operas
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album: Russian Melodies
album: Bulgarian And Russian Orthodox Chants
album: Lebendige Vergangenheit - Boris Christoff
album: Boito: Mefistofele
album: Boris Christoff - The Great Russian Bass Roles
album: Mussorgsky : Songs
album: Attila
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album: Tsar And Kings
album: The 1949-1952 Recordings
album: Songs of Tchaikovsky
album: Songs Of Rachmaninoff
album: La Forza Del Destino
album: Verdi: Don Carlos (1886 Version, Mono Version)
album: Balakirev: Melodies
album: Aida
album: Singers of the Century: Boris Christoff - Italian & Russian Opera Recital
album: Weber: Der Freischütz, Op. 77, J. 277 (Sung in Italian) [Live]
album: Boito & Bellini & Bellini: Great Voices of the Century - Baritones & Basses Vol. 3
track: Mussorgsky: The Nursery: No. 7, Sailor the Cat
track: Prince Igor, Act II: Polovtsian Dances
track: Faust - opera in five acts (1989 Digital Remaster), Act II: Le veau d'or est toujours debout! (Méphistophélès/Choeur)

Mussorgsky: Boris Godunov, Act 1: Pimen's Monologue. "Eshche odno poslednee skazan's" (Pimen)
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Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Bozhe krepkiy pravyi" (Chorus, Grigoriy, Pimen)
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  date published: 2026-07-08T03:20:19Z
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Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Ty vse pisal i snom ne pozabylsa" (Grigoriy, Pimen)
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additional property: OTSTimestamp
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  value: 2026-07-08T03:22:41+00:00
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:22:41+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e10e129de7eff851388bf762fc2607ddc189ca1bec23fbc602018e3e2f17a4d. 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/FRZ115206637.
  date published: 2026-07-08T03:53:27Z
audio: Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Ty vse pisal i snom ne pozabylsa" (Grigoriy, Pimen)
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  additional property: Mode (Major/Minor)
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    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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    value: 0.148
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.094
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.261
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Mussorgsky: Boris Godunov, Act 1: "Zvonyat k zautreni" (Chorus, Grigoriy, Pimen)
type: MusicRecording
duration: PT3M47S
duration ms: 227533
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: Boris Christoff
by artist: Chœurs russes de Paris
by artist: Nicolai Gedda
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
isrc code: FRZ115206639
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206639
additional property: OTSTimestamp
  type: PropertyValue
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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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
  type: PropertyValue
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subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77bf5fd13aec58fcdc02ee99c1d79898bff49f2b0ee3f3c96fa050369339d32. 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/FRZ115206639.
  date published: 2026-07-08T03:20:19Z
audio: Mussorgsky: Boris Godunov, Act 1: "Zvonyat k zautreni" (Chorus, Grigoriy, Pimen)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 95.812
  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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    value: -31.503
  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
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Mussorgsky: Boris Godunov, Act 1: "Kak edet en" (Varlaam, Grigoriy, The Hostess)
type: MusicRecording
duration: PT3M38S
duration ms: 218400
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: Boris Christoff
by artist: Lydia Romanova
by artist: Nicolai Gedda
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
isrc code: FRZ115206643
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206643
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:22:41Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 957120
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:22:41+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7556565ae697cb2fc64fd261393443a6ae1fc6542d6b1cef5f3cc06c654cd181. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206643.
  date published: 2026-07-08T03:22:41Z
audio: Mussorgsky: Boris Godunov, Act 1: "Kak edet en" (Varlaam, Grigoriy, The Hostess)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 97.847
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
    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)
    type: PropertyValue
    value: 0.197
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.097
  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
    value: Major

Mussorgsky: Boris Godunov, Act 1: Boris' Crime. "Davno, chestnoy otets" (Grigoriy, Pimen)
type: MusicRecording
duration: PT2M3S
duration ms: 123640
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: Boris Christoff
by artist: Nicolai Gedda
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6924c75feedde9dd322fd2cab43793ec7bb3fec78a7e7db22764fe85d83bc47. 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/FRZ115206638.
  date published: 2026-07-31T23:51:35Z
audio: Mussorgsky: Boris Godunov, Act 1: Boris' Crime. "Davno, chestnoy otets" (Grigoriy, Pimen)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 101.439
  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: 0.29
  additional property: Energy
    type: PropertyValue
    value: 0.062
  additional property: Speechiness
    type: PropertyValue
    value: 0.052
  additional property: Acousticness
    type: PropertyValue
    value: 0.915
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.103
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.189
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.052
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ115206638
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960481
additional property: BitcoinTime
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206638
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: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:51:35+00:00
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

Mussorgsky: Boris Godunov, Act 1: Song of the Hostess. "Poymala ya siza seleznya" (The Hostess, Varlaam, Misail)
type: MusicRecording
duration: PT3M24S
duration ms: 204533
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: André Bielecki
by artist: Boris Christoff
by artist: Lydia Romanova
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da36e44ccc88221ea8aac284971d1634a708d82f0bb7668f5ceb6309ee91c30. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ115206640.
  date published: 2026-07-31T19:53:13Z
audio: Mussorgsky: Boris Godunov, Act 1: Song of the Hostess. "Poymala ya siza seleznya" (The Hostess, Varlaam, Misail)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 119.798
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.404
  additional property: Energy
    type: PropertyValue
    value: 0.131
  additional property: Speechiness
    type: PropertyValue
    value: 0.035
  additional property: Acousticness
    type: PropertyValue
    value: 0.942
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.018
  additional property: Liveness
    type: PropertyValue
    value: 0.246
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.303
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.683
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ115206640
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960455
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T19:53:13+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206640
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960455
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960455
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T19:53:13+00:00
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

Mussorgsky: Boris Godunov, Act 1: "Zheno, mir domu tvoemu!" (Varlaam, Misail, The Hostess, Grigoriy)
type: MusicRecording
duration: PT2M30S
duration ms: 150826
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: André Bielecki
by artist: Boris Christoff
by artist: Lydia Romanova
by artist: Nicolai Gedda
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d83e2366e2d290a3f12640799fc281c1d1e105038d17f08072340e4a198e60. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206641.
  date published: 2026-07-31T12:24:41Z
audio: Mussorgsky: Boris Godunov, Act 1: "Zheno, mir domu tvoemu!" (Varlaam, Misail, The Hostess, Grigoriy)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 145.036
  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: 0.397
  additional property: Energy
    type: PropertyValue
    value: 0.091
  additional property: Speechiness
    type: PropertyValue
    value: 0.064
  additional property: Acousticness
    type: PropertyValue
    value: 0.945
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.015
  additional property: Liveness
    type: PropertyValue
    value: 0.22
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.217
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.642
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ115206641
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960397
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T12:24:41+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206641
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: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T12:24:41+00:00
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

Mussorgsky: Boris Godunov, Act 1: Drinking Song. "Kak vo gorode bylo vo Kazani" (Varlaam, Grigoriy, Misail)
type: MusicRecording
duration: PT3M34S
duration ms: 214800
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: André Bielecki
by artist: Boris Christoff
by artist: Nicolai Gedda
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528c65ca794db3b7e1ffaea197f6b4ab806a7d33adc6010eedec9e96abfffd9a. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/FRZ115206642.
  date published: 2026-07-31T05:48:30Z
audio: Mussorgsky: Boris Godunov, Act 1: Drinking Song. "Kak vo gorode bylo vo Kazani" (Varlaam, Grigoriy, Misail)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 99.125
  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: 0.398
  additional property: Energy
    type: PropertyValue
    value: 0.28
  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.408
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.425
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ115206642
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
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additional property: BitcoinTime
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206642
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960352
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960352
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T05:48:30+00:00
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

Mussorgsky: Boris Godunov, Act 2: Clock Scene. "Uf, tyazhelo!" (Boris)
type: MusicRecording
duration: PT3M39S
duration ms: 219560
explicit: false
by artist: Modest Mussorgsky
by artist: Issay Dobrowen
by artist: Boris Christoff
by artist: Orchestre National Radiodiffusion Française
in album: Mussorgsky: Boris Godunov
  type: MusicAlbum
  date published: 2024-01-26
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df8164bea89b0081a32b65af427d92fe0d49731afe184f4111e75b91369a516. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206657.
  date published: 2026-07-31T17:29:52Z
audio: Mussorgsky: Boris Godunov, Act 2: Clock Scene. "Uf, tyazhelo!" (Boris)
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 165.849
  additional property: Musical Key
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    value: 1
  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
    type: PropertyValue
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.101
  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
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isrc code: FRZ115206657
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
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additional property: BitcoinTime
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206657
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960441
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960441
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T17:29:52+00:00
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

Blazhen Mouzh (Blessed Is the Man)
type: MusicRecording
duration: PT3M40S
duration ms: 220866
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
isrc code: BGA260704003
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T13:15:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9ba0e848790bd48f0d62d6ea30069c3f58fd4af9fa1bdc3b2d526e88e9775b06
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/BGA260704003
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 957118
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba0e848790bd48f0d62d6ea30069c3f58fd4af9fa1bdc3b2d526e88e9775b06. 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/BGA260704003.
  date published: 2026-07-08T03:20:19Z
audio: Blazhen Mouzh (Blessed Is the Man)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 105.464
  additional property: Musical Key
    type: PropertyValue
    value: 10
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    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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  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.721
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Hvalite Imya Gospodne (Praise the Name of God)
type: MusicRecording
duration: PT4M39S
duration ms: 279733
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
isrc code: BGA260704004
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T15:56:31+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x63bf3fb94abfc728c974da4154b2e6a41a4f91f75140ff3c4a17da33ceb1939e
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/BGA260704004
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 957118
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bf3fb94abfc728c974da4154b2e6a41a4f91f75140ff3c4a17da33ceb1939e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BGA260704004.
  date published: 2026-07-08T03:22:41Z
audio: Hvalite Imya Gospodne (Praise the Name of God)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 165.492
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.114
  additional property: Energy
    type: PropertyValue
    value: 0.201
  additional property: Speechiness
    type: PropertyValue
    value: 0.05
  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
    type: PropertyValue
    value: 0.003
  additional property: Liveness
    type: PropertyValue
    value: 0.181
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.04
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.155
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major

Zhertva Vechernyaya (Evening Sacrifice)
type: MusicRecording
duration: PT5M12S
duration ms: 312160
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea50c70e596cd550ef88a777c24c6cd0beebb92af565ddbae8e07825bcb71da7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BGA260704001.
  date published: 2026-07-31T02:19:15Z
audio: Zhertva Vechernyaya (Evening Sacrifice)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 108.957
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.189
  additional property: Energy
    type: PropertyValue
    value: 0.152
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.981
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.068
  additional property: Liveness
    type: PropertyValue
    value: 0.119
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.04
  additional property: Loudness (dB)
    type: PropertyValue
    value: -27.084
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: BGA260704001
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960334
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T02:19:15+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BGA260704001
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960334
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960334
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T02:19:15+00:00
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

Tebe Poem (We Hymn Thee, We Bless Thee)
type: MusicRecording
duration: PT3M26S
duration ms: 206840
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112368ae4d640c1fd79e07756e7d9b555f18bfea476870ebea4f701dc032b1d2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BGA260704002.
  date published: 2026-07-31T20:22:46Z
audio: Tebe Poem (We Hymn Thee, We Bless Thee)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 106.392
  additional property: Musical Key
    type: PropertyValue
    value: 11
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.185
  additional property: Energy
    type: PropertyValue
    value: 0.068
  additional property: Speechiness
    type: PropertyValue
    value: 0.035
  additional property: Acousticness
    type: PropertyValue
    value: 0.987
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.26
  additional property: Liveness
    type: PropertyValue
    value: 0.111
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.037
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.269
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: BGA260704002
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960459
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T20:22:46+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BGA260704002
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960459
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960459
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T20:22:46+00:00
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

Razboinika Blagorazoumnago (The Jubilicious Villain)
type: MusicRecording
duration: PT2M45S
duration ms: 165560
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6003c20e1b57aa22e5742f2a8f4e6ccf8f64fc15a09469ed8bc8f88d6afd814. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BGA260704005.
  date published: 2026-07-31T18:48:12Z
audio: Razboinika Blagorazoumnago (The Jubilicious Villain)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 109.756
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.223
  additional property: Energy
    type: PropertyValue
    value: 0.194
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.978
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.062
  additional property: Liveness
    type: PropertyValue
    value: 0.217
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.143
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.864
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: BGA260704005
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960448
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T18:48:12+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BGA260704005
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960448
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960448
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T18:48:12+00:00
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

Veliko Slavoslovenie (The Great Glorification)
type: MusicRecording
duration: PT11M6S
duration ms: 666733
explicit: false
by artist: Boris Christoff
in album: Bulgarian And Russian Orthodox Chants
  type: MusicAlbum
  date published: 2007-01-01
genre: opera
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  date published: 2026-07-31T19:53:13Z
audio: Veliko Slavoslovenie (The Great Glorification)
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additional property: OTSVerifyInstructions
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Mnogaya Leta (Grant, Oh Lord, Many Years)
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  date published: 2026-07-31T02:19:15Z
audio: Mnogaya Leta (Grant, Oh Lord, Many Years)
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Mussorgsky: Cradle Song
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duration: PT5M50S
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by artist: Modest Mussorgsky
by artist: Boris Christoff
by artist: Alexandre Labinsky
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genre: late-romantic-era
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audio: Mussorgsky: Cradle Song
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Mussorgsky: The Nursery: No. 7, Sailor the Cat
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by artist: Alexandre Labinsky
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audio: Mussorgsky: The Nursery: No. 7, Sailor the Cat
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Prince Igor, Act II: Polovtsian Dances
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by artist: Alexei Milkovsky
by artist: Boris Christoff
by artist: Constantin Chekerliski
by artist: Cyril Dulguerov
by artist: Jerzy Semkow
by artist: Julia Wiener
by artist: Luben Mihailov
by artist: Reni Penkova
by artist: Sofia National Opera Chorus
by artist: Sofia National Opera Theater Orchestra
by artist: Todor Todorov
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  date published: 2026-07-08T03:20:19Z
audio: Prince Igor, Act II: Polovtsian Dances
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Faust - opera in five acts (1989 Digital Remaster), Act II: Le veau d'or est toujours debout! (Méphistophélès/Choeur)
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by artist: Ernest Blanc
by artist: Choeurs et Orchestre de l'Opéra National de Paris
by artist: Victoria de los Ángeles
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by artist: Victor Autran
by artist: Liliane Berton
by artist: Rita Gorr
by artist: Boris Christoff
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popularity: 4
genre: classical
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  date published: 2026-07-30T12:06:10Z
audio: Faust - opera in five acts (1989 Digital Remaster), Act II: Le veau d'or est toujours debout! (Méphistophélès/Choeur)
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Speechiness
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Acousticness
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Loudness (dB)
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Mussorgsky: Boris Godunov, Prologue: Shchelkalov's Adress. "Pravoslavnye! Ne umolim boyarin" (Shchelkalov)
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Verdi: Ernani (Recorded 1957) [Live]
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Verdi: Don Carlos (Recorded 1961)
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Tchaikovsky: Mazeppa (Sung in Italian) [Recorded Live 1954]
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Verdi: Don Carlo
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Meyerbeer: Roberto le Diable (Live)
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Die Meistersinger von Nürnberg sung in Italian
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date published: 2022-03-11

Les plus belles musiques du monde : Splendeurs du chant russe, Vol. 1
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Wagner: Die Meistersinger von Nurnberg, WWV 96 (Sung in Italian)
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Mussorgsky: Khovanshchina (Sung in Italian) (Live)
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Verdi - Don Carlo
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Mussorgsky: The Complete Songs
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Verdi: Simon Boccanegra
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Verdi: Don Carlos (Live Recordings 1958)
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Glinka: A Life for the Tsar (Arr. N. Rimsky-Korsakov)
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Verdi: Aida (Excerpts)
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Icon: Boris Christoff
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Mikhail Glinka : Songs (1959)
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Lebendige Vergangeneit - Boris Christoff (Vol. 4)
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Claudio Monteverdi, L'Incoronazione Di Poppea
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Gounod: Faust
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Lebendige Vergangenheit - Boris Christoff (Vol.3)
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Verdi: Ernani
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Edition Herbert von Karajan, Vol. II (Verdi: Messa di Requiem)
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Boris Christoff - Arias form Russian Classical Operas
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Lebendige Vergangenheit - Boris Christoff (Vol.2)
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Russian Melodies
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Bulgarian And Russian Orthodox Chants
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Lebendige Vergangenheit - Boris Christoff
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Boito: Mefistofele
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Boris Christoff - The Great Russian Bass Roles
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Mussorgsky : Songs
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Attila
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Saul & David
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Verdi: Aida
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Tsar And Kings
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The 1949-1952 Recordings
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Songs of Tchaikovsky
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Songs Of Rachmaninoff
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La Forza Del Destino
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Verdi: Don Carlos (1886 Version, Mono Version)
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Balakirev: Melodies
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Aida
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Singers of the Century: Boris Christoff - Italian & Russian Opera Recital
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Weber: Der Freischütz, Op. 77, J. 277 (Sung in Italian) [Live]
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Boito & Bellini & Bellini: Great Voices of the Century - Baritones & Basses Vol. 3
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