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type: MusicGroup
genre: opera
popularity: 5
followers: 95
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSVerifyInstructions
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  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-16T07:53:13Z
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track: Prince Igor, Prologue: Introduction "Knyzya, pora nam vystupat"
track: Prince Igor, Act I Scene 1: Scene "Stoy, rebyata, slukhay!"
track: The Queen of Spades, Op. 68, Act II Scene 3: Scene and Yeletsky's Aria "Hozyain prosit"
track: The Queen of Spades, Op. 68, Act II Scene 3: Scene "Posle predstavleniya zhdite menya v zale"
track: The Queen of Spades, Op. 68, Act II Scene 3: Final Scene "Kto pylko i strastno lyubya"
track: Prince Igor, Act I Scene 1: Chorus "Goy! Slava! Slava Volodimiru"
track: Prince Igor, Act I Scene 1: Chorus and Scene "Oy, likhonko!"
track: Prince Igor, Act I Scene 1: "Chto u knyazya da Volodimira"
track: Prince Igor, Act I Scene 1: "Da, vot komu by knyazhit na Putivle!"
track: The Queen of Spades, Op. 68, Act I Scene 1: Scene and Herman's Arioso "Chem konchilas vchera igra?"
track: The Queen of Spades, Op. 68, Act I Scene 1: Scene and Tomsky's Ballade "Kakaya vedma eta Grafinya"
track: The Queen of Spades, Op. 68, Act I Scene 1: Final Scene "Se non e vero"

Prince Igor, Prologue: Introduction "Knyzya, pora nam vystupat"
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duration: PT5M50S
duration ms: 350394
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by artist: Alexander Borodin
by artist: Иван Петров
by artist: Артур Эйзен
by artist: Владимир Атлантов
by artist: Valery Yaroslavtsev
by artist: Konstantin Baskov
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
  type: MusicAlbum
  date published: 2012
popularity: 2
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
isrc code: UK2Y21602940
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: OTSTimestamp
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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
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Prince Igor, Prologue: Introduction "Knyzya, pora nam vystupat"
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Prince Igor, Act I Scene 1: Scene "Stoy, rebyata, slukhay!"
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duration: PT0M50S
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explicit: false
by artist: Alexander Borodin
by artist: Konstantin Baskov
by artist: Valery Yaroslavtsev
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
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  date published: 2012
popularity: 1
genre: classical
genre: late-romantic-era
genre: early-modern-classical
genre: russian-romanticism
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Prince Igor, Act I Scene 1: Scene "Stoy, rebyata, slukhay!"
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The Queen of Spades, Op. 68, Act II Scene 3: Scene and Yeletsky's Aria "Hozyain prosit"
type: MusicRecording
duration: PT1M30S
duration ms: 90320
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Anatoly Mishutin
by artist: Andrei Sokolov
by artist: Mikhail Kiselyov
by artist: Valery Yaroslavtsev
by artist: Boris Khaikin
by artist: Bolshoi Theatre Orchestra
in album: Tchaikovsky: The Queen of Spades, Op. 68
  type: MusicAlbum
  date published: 2013-01-01
isrc code: UK2Y21800872
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: The Queen of Spades, Op. 68, Act II Scene 3: Scene and Yeletsky's Aria "Hozyain prosit"
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The Queen of Spades, Op. 68, Act II Scene 3: Scene "Posle predstavleniya zhdite menya v zale"
type: MusicRecording
duration: PT2M37S
duration ms: 157693
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Andrei Sokolov
by artist: Valery Yaroslavtsev
by artist: Zurab Anjaparidze
by artist: Boris Khaikin
by artist: Bolshoi Theatre Orchestra
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
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  date published: 2026-07-08T03:22:41Z
audio: The Queen of Spades, Op. 68, Act II Scene 3: Scene "Posle predstavleniya zhdite menya v zale"
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The Queen of Spades, Op. 68, Act II Scene 3: Final Scene "Kto pylko i strastno lyubya"
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by artist: Anatoly Mishutin
by artist: Tamara Milashkina
by artist: Valery Yaroslavtsev
by artist: Zurab Anjaparidze
by artist: Bolshoi Theatre Choir
by artist: Boris Khaikin
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additional property: OTSVerifyInstructions
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  date published: 2026-07-08T03:22:41Z
audio: The Queen of Spades, Op. 68, Act II Scene 3: Final Scene "Kto pylko i strastno lyubya"
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    value: 0.058
  additional property: Acousticness
    type: PropertyValue
    value: 0.946
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.004
  additional property: Liveness
    type: PropertyValue
    value: 0.111
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.206
  additional property: Loudness (dB)
    type: PropertyValue
    value: -15.355
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major

Prince Igor, Act I Scene 1: Chorus "Goy! Slava! Slava Volodimiru"
type: MusicRecording
duration: PT2M1S
duration ms: 121454
explicit: false
by artist: Alexander Borodin
by artist: Valery Yaroslavtsev
by artist: Konstantin Baskov
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
  type: MusicAlbum
  date published: 2012
popularity: 2
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 0x734024137ebba1e812310344678184ae3aecdee60b260a3d96cc3cccc32cd78f. 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/UK2Y21602942.
  date published: 2026-07-31T23:51:35Z
audio: Prince Igor, Act I Scene 1: Chorus "Goy! Slava! Slava Volodimiru"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 111.269
  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: 0.34
  additional property: Energy
    type: PropertyValue
    value: 0.273
  additional property: Speechiness
    type: PropertyValue
    value: 0.03
  additional property: Acousticness
    type: PropertyValue
    value: 0.956
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.003
  additional property: Liveness
    type: PropertyValue
    value: 0.062
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.493
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.063
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: UK2Y21602942
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: 960481
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T23:51:35+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602942
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

Prince Igor, Act I Scene 1: Chorus and Scene "Oy, likhonko!"
type: MusicRecording
duration: PT2M29S
duration ms: 149685
explicit: false
by artist: Alexander Borodin
by artist: Артур Эйзен
by artist: Konstantin Baskov
by artist: Valery Yaroslavtsev
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
  type: MusicAlbum
  date published: 2012
popularity: 2
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 0xa764a0d47f59a3f1126478be74cc6fc101d158e2fcdaeb5e1c63f348056a9fc0. 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/UK2Y21602945.
  date published: 2026-07-31T12:24:41Z
audio: Prince Igor, Act I Scene 1: Chorus and Scene "Oy, likhonko!"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 138.99
  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: 0.363
  additional property: Energy
    type: PropertyValue
    value: 0.182
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.975
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.137
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.187
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.251
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: UK2Y21602945
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/UK2Y21602945
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

Prince Igor, Act I Scene 1: "Chto u knyazya da Volodimira"
type: MusicRecording
duration: PT3M12S
duration ms: 192316
explicit: false
by artist: Alexander Borodin
by artist: Konstantin Baskov
by artist: Valery Yaroslavtsev
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
  type: MusicAlbum
  date published: 2012
popularity: 1
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 0xc68774949825bae90f21ad049586d3f4ed16ed3f4f5f60d4502c1645132fc000. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602947.
  date published: 2026-07-31T19:53:57Z
audio: Prince Igor, Act I Scene 1: "Chto u knyazya da Volodimira"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 133.759
  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: 0.38
  additional property: Energy
    type: PropertyValue
    value: 0.332
  additional property: Speechiness
    type: PropertyValue
    value: 0.038
  additional property: Acousticness
    type: PropertyValue
    value: 0.946
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.008
  additional property: Liveness
    type: PropertyValue
    value: 0.388
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.499
  additional property: Loudness (dB)
    type: PropertyValue
    value: -15.822
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: UK2Y21602947
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: 960456
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T19:53:57+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602947
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960456
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960456
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T19:53:57+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

Prince Igor, Act I Scene 1: "Da, vot komu by knyazhit na Putivle!"
type: MusicRecording
duration: PT2M27S
duration ms: 147151
explicit: false
by artist: Alexander Borodin
by artist: Konstantin Baskov
by artist: Valery Yaroslavtsev
by artist: хор Большого театра
by artist: Mark Ermler
by artist: Оркестр Большого театра
in album: Borodin: Prince Igor
  type: MusicAlbum
  date published: 2012
popularity: 1
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 0x908fa573088265047e6060d99342adc0dbd1d68f172c87c33f5bd02ac407dc2a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602948.
  date published: 2026-07-31T13:04:34Z
audio: Prince Igor, Act I Scene 1: "Da, vot komu by knyazhit na Putivle!"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 108.498
  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: 0.381
  additional property: Energy
    type: PropertyValue
    value: 0.326
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.834
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.02
  additional property: Liveness
    type: PropertyValue
    value: 0.241
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.617
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.532
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: UK2Y21602948
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: 960403
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T13:04:34+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602948
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960403
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960403
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T13:04:34+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

The Queen of Spades, Op. 68, Act I Scene 1: Scene and Herman's Arioso "Chem konchilas vchera igra?"
type: MusicRecording
duration: PT2M51S
duration ms: 171813
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Andrei Sokolov
by artist: Mikhail Kiselyov
by artist: Valery Yaroslavtsev
by artist: Zurab Anjaparidze
by artist: Boris Khaikin
by artist: Bolshoi Theatre Orchestra
in album: Tchaikovsky: The Queen of Spades, Op. 68
  type: MusicAlbum
  date published: 2013-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38c55692290084b2b19aae7f8018799a2b41561daf30f98c12b0a6f934a0698. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/UK2Y21800849.
  date published: 2026-07-30T06:39:12Z
audio: The Queen of Spades, Op. 68, Act I Scene 1: Scene and Herman's Arioso "Chem konchilas vchera igra?"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 165.325
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.331
  additional property: Energy
    type: PropertyValue
    value: 0.131
  additional property: Speechiness
    type: PropertyValue
    value: 0.072
  additional property: Acousticness
    type: PropertyValue
    value: 0.989
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.211
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.173
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.638
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: UK2Y21800849
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: 960216
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T06:39:12+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800849
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960216
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960216
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T06:39:12+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

The Queen of Spades, Op. 68, Act I Scene 1: Scene and Tomsky's Ballade "Kakaya vedma eta Grafinya"
type: MusicRecording
duration: PT1M30S
duration ms: 90400
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Andrei Sokolov
by artist: Mikhail Kiselyov
by artist: Valery Yaroslavtsev
by artist: Boris Khaikin
by artist: Bolshoi Theatre Orchestra
in album: Tchaikovsky: The Queen of Spades, Op. 68
  type: MusicAlbum
  date published: 2013-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef9bfc22cb02ceea9f717f6ac2cdd83d731e8efc55c3f5d692aae600c2e2ea5. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/UK2Y21800856.
  date published: 2026-07-30T01:34:28Z
audio: The Queen of Spades, Op. 68, Act I Scene 1: Scene and Tomsky's Ballade "Kakaya vedma eta Grafinya"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 93.714
  additional property: Musical Key
    type: PropertyValue
    value: 11
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.528
  additional property: Energy
    type: PropertyValue
    value: 0.13
  additional property: Speechiness
    type: PropertyValue
    value: 0.069
  additional property: Acousticness
    type: PropertyValue
    value: 0.984
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.111
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.496
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.315
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: UK2Y21800856
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: 960187
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T01:34:28+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800856
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960187
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960187
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:34:28+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

The Queen of Spades, Op. 68, Act I Scene 1: Final Scene "Se non e vero"
type: MusicRecording
duration: PT3M43S
duration ms: 223413
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Andrei Sokolov
by artist: Valery Yaroslavtsev
by artist: Zurab Anjaparidze
by artist: Boris Khaikin
by artist: Bolshoi Theatre Orchestra
in album: Tchaikovsky: The Queen of Spades, Op. 68
  type: MusicAlbum
  date published: 2013-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5ab82e408170983410e488bdaa5237190e6cb282cb61ca9523c547356b05e2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/UK2Y21800858.
  date published: 2026-07-30T04:47:22Z
audio: The Queen of Spades, Op. 68, Act I Scene 1: Final Scene "Se non e vero"
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 125.729
  additional property: Musical Key
    type: PropertyValue
    value: 6
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.388
  additional property: Energy
    type: PropertyValue
    value: 0.392
  additional property: Speechiness
    type: PropertyValue
    value: 0.046
  additional property: Acousticness
    type: PropertyValue
    value: 0.903
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.007
  additional property: Liveness
    type: PropertyValue
    value: 0.35
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.187
  additional property: Loudness (dB)
    type: PropertyValue
    value: -15.249
  additional property: Key Name
    type: PropertyValue
    value: F#
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: UK2Y21800858
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: 960207
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T04:47:22+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800858
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960207
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960207
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T04:47:22+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