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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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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album: Lachner: Catharina Cornaro
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album: Berte, H.: Dreimaderlhaus (Das) [Operetta]
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album: Lehar, F.: Merry Widow (The) [Operetta]
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album: Krenek, E.: Diktator (Der) / Schwergewicht, Oder Die Ehre Der Nation / Das Geheime Konigreich [Opera]
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album: The Essential Warsaw Philharmonic Orchestra
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album: Dvořák: Requiem, Op. 89
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-30T09:58:01Z
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-02T05:09:12Z
    audio: Requiem, Op. 89 B. 165: Introitus: Requiem aeternam - Kyrie (Vocal Quartet, Chorus)
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  track: Requiem, Op. 89 B. 165: Graduale: Requiem aeternam (Soprano, Chorus)
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  track: Requiem, Op. 89 B. 165: Sequentia: Dies irae (Chorus)
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  track: Requiem, Op. 89 B. 165: Agnus Dei (Vocal Quartet, Chorus)
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  track: Requiem, Op. 89 B. 165: Sequentia: Confutatis maledictis (Chorus)
  track: Requiem, Op. 89 B. 165: Sequentia: Lacrimosa (Vocal Quartet, Chorus)
album: Classical Chillout: Choral, Vol. 1
album: Weinberger: Wallenstein (Live)
album: Die Gala-Nacht der Klassik-Stars
album: Galakonzert Der Operette
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T03:35:13Z
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-13T07:53:33Z
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Requiem, Op. 89 B. 165: Sanctus (Vocal Quartet, Chorus)
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Requiem, Op. 89 B. 165: Sequentia: Dies irae (Chorus)
type: MusicRecording
duration: PT2M4S
duration ms: 124946
explicit: false
by artist: Antonín Dvořák
by artist: Chór Filharmonii Narodowej w Warszawie
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413603
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/953520
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413603
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T13:32:09Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f456410a45cfef53242619af36cf3dba806e21c246ade6bfafdc8bad03265cd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413603.
  date published: 2026-06-13T13:32:09Z
audio: Requiem, Op. 89 B. 165: Sequentia: Dies irae (Chorus)
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Requiem, Op. 89 B. 165: Pie Jesu (Vocal Quartet, Chorus)
type: MusicRecording
duration: PT5M31S
duration ms: 331066
explicit: false
by artist: Antonín Dvořák
by artist: Christiane Libor
by artist: Ewa Wolak
by artist: Daniel Kirch
by artist: Janusz Monarcha
by artist: Chór Filharmonii Narodowej w Warszawie
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413704
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413704
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T05:43:45Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38592101cab8a0d88aa8b832a47ab3e725c79f60d7704069d30eca90bd7f27e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKI191413704.
  date published: 2026-07-30T05:43:45Z
audio: Requiem, Op. 89 B. 165: Pie Jesu (Vocal Quartet, Chorus)
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  additional property: Danceability
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  additional property: Speechiness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -33.762
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    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Requiem, Op. 89 B. 165: Sequentia: Tuba mirum (Alto, Tenor, Bass, Chorus)
type: MusicRecording
duration: PT8M39S
duration ms: 519240
explicit: false
by artist: Antonín Dvořák
by artist: Ewa Wolak
by artist: Daniel Kirch
by artist: Janusz Monarcha
by artist: Chór Filharmonii Narodowej w Warszawie
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413604
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T07:24:00+00:00
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/957819
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413604
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-13T07:53:33Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411349b845d86b12a5846dc45ccad09a2b3f0f047ef832ab068286afc9f079e6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKI191413604.
  date published: 2026-07-13T07:53:33Z
audio: Requiem, Op. 89 B. 165: Sequentia: Tuba mirum (Alto, Tenor, Bass, Chorus)
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  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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    value: 1
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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
    type: PropertyValue
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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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  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.036
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.576
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Requiem, Op. 89 B. 165: Sequentia: Quid sum miser (Vocal Quartet, Chorus)
type: MusicRecording
duration: PT6M20S
duration ms: 380626
explicit: false
by artist: Antonín Dvořák
by artist: Christiane Libor
by artist: Ewa Wolak
by artist: Daniel Kirch
by artist: Janusz Monarcha
by artist: Chór Filharmonii Narodowej w Warszawie
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413605
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T10:48:24+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6f94927b8c6fb2c3882421276a6b279d6831ae5bc64990f396e50f64da2adb43
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957073
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413605
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T18:39:05Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f94927b8c6fb2c3882421276a6b279d6831ae5bc64990f396e50f64da2adb43. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI191413605.
  date published: 2026-07-07T18:39:05Z
audio: Requiem, Op. 89 B. 165: Sequentia: Quid sum miser (Vocal Quartet, Chorus)
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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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)
    type: PropertyValue
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.687
  additional property: Key Name
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  additional property: Mode Name
    type: PropertyValue
    value: Major

Requiem, Op. 89 B. 165: Agnus Dei (Vocal Quartet, Chorus)
type: MusicRecording
duration: PT10M55S
duration ms: 655053
explicit: false
by artist: Antonín Dvořák
by artist: Christiane Libor
by artist: Ewa Wolak
by artist: Daniel Kirch
by artist: Janusz Monarcha
by artist: Chór Filharmonii Narodowej w Warszawie
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413705
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-29T19:48:10+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x03f650a3fb56fe1c688b3ad537322defa48b2986593184540697df5d24adbe18
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960144
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960144
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413705
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T21:09:47Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f650a3fb56fe1c688b3ad537322defa48b2986593184540697df5d24adbe18. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI191413705.
  date published: 2026-07-29T21:09:47Z
audio: Requiem, Op. 89 B. 165: Agnus Dei (Vocal Quartet, Chorus)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
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  additional property: Musical Key
    type: PropertyValue
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.348
  additional property: Key Name
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    value: F#
  additional property: Mode Name
    type: PropertyValue
    value: Major

Requiem, Op. 89 B. 165: Sequentia: Recordare, Jesu Pie (Vocal Quartet)
type: MusicRecording
duration: PT7M8S
duration ms: 428093
explicit: false
by artist: Antonín Dvořák
by artist: Christiane Libor
by artist: Ewa Wolak
by artist: Daniel Kirch
by artist: Janusz Monarcha
by artist: Orkiestra Filharmonii Narodowej w Warszawie
by artist: Antoni Wit
in album: Dvořák: Requiem, Op. 89
  type: MusicAlbum
  date published: 2014-11-04
genre: classical
genre: late-romantic-era
genre: czech-classical
isrc code: HKI191413606
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T01:03:10+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x71aa7aa0717f37a5c9b09156f9f0044907a1b06d5df513bb3f7aee1e832114d8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960185
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413606
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:32:48Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71aa7aa0717f37a5c9b09156f9f0044907a1b06d5df513bb3f7aee1e832114d8. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/HKI191413606.
  date published: 2026-07-30T01:32:48Z
audio: Requiem, Op. 89 B. 165: Sequentia: Recordare, Jesu Pie (Vocal Quartet)
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
    type: PropertyValue
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  additional property: Mode (Major/Minor)
    type: PropertyValue
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  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
    type: PropertyValue
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Instrumentalness
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Classical Chillout: Choral, Vol. 1
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Weinberger: Wallenstein (Live)
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Die Gala-Nacht der Klassik-Stars
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Galakonzert Der Operette
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Spring Parade
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Schumann: Scenes from Goethe's Faust
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Lehar, F.: Vocal Music
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Albinoni, T.G.: Concertos, Opp. 5, 7 and 9
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Lortzing: Regina
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Toch, E.: Princess and the Pea (The) [Opera] / Das Hassliche Entlein
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