Yuri Smirnov
type: MusicGroup
popularity: 8
followers: 106
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7d72d9f603149429c5fb0582db9f1a32eaa7cac16080c2f0ce89b94a342b980e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ff705f5d-ca19-4320-b1c0-77140610e525
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7d72d9f603149429c5fb0582db9f1a32eaa7cac16080c2f0ce89b94a342b980e","name":"Yuri Smirnov","registered_at":"2026-06-21T18:51:05Z","symbol":"NIM2004698","token_address":"0x2edb2dbefb86d9a7f4522208d253b2eb0e29b85d","type":"artist","uuid":"ff705f5d-ca19-4320-b1c0-77140610e525"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d72d9f603149429c5fb0582db9f1a32eaa7cac16080c2f0ce89b94a342b980e. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.json and https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0x7d72d9f603149429c5fb0582db9f1a32eaa7cac16080c2f0ce89b94a342b980e","name":"Yuri Smirnov","registered_at":"2026-06-21T18:51:05Z","symbol":"NIM2004698","token_address":"0x2edb2dbefb86d9a7f4522208d253b2eb0e29b85d","type":"artist","uuid":"ff705f5d-ca19-4320-b1c0-77140610e525"}
track: Concerto grosso no.1 (1976-77): 1. Preludio: Andante
track: Concerto grosso no.1 (1976-77): 2. Toccata: Allegro
track: Concerto grosso no.1 (1976-77): 5. Rondo: Agitato
track: Concerto grosso no.1 (1976-77): 3. Recitativo: Lento
track: Concerto grosso no.1 (1976-77): 4. Cadenza (without tempo marking)
track: Concerto grosso no.1 (1976-77): 6. Postludio: Andante - Allegro - Andante
track: Quasi una sonata (1987) For Violin And Chamber Orchestra

Concerto grosso no.1 (1976-77): 1. Preludio: Andante
type: MusicRecording
duration: PT4M58S
duration ms: 298493
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
isrc code: DEF058803641
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-26T04:03:55+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x724ca0ad4b626a04a56e1680ee0d8dfb09651d3db75e921b5915bee7c1f4e079
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058803641
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
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: 956304
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-02T03:55:08+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 0x724ca0ad4b626a04a56e1680ee0d8dfb09651d3db75e921b5915bee7c1f4e079. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEF058803641.
  date published: 2026-07-02T03:55:08Z
audio: Concerto grosso no.1 (1976-77): 1. Preludio: Andante
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 113.252
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.169
  additional property: Energy
    type: PropertyValue
    value: 0.02
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.956
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.036
  additional property: Liveness
    type: PropertyValue
    value: 0.074
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.033
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.203
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Concerto grosso no.1 (1976-77): 2. Toccata: Allegro
type: MusicRecording
duration: PT4M25S
duration ms: 265906
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
isrc code: DEF058803642
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-19T13:22:49+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbd5a55e71a9f7d5ed0843fc30e0e4c5f678e4f931d4ec2e4b2000a25d881f382
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956302
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956302
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058803642
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:30:09+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: 956302
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-02T03:30:09+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 0xbd5a55e71a9f7d5ed0843fc30e0e4c5f678e4f931d4ec2e4b2000a25d881f382. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEF058803642.
  date published: 2026-07-02T03:55:08Z
audio: Concerto grosso no.1 (1976-77): 2. Toccata: Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 141.317
  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: 0.459
  additional property: Energy
    type: PropertyValue
    value: 0.459
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.918
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.793
  additional property: Liveness
    type: PropertyValue
    value: 0.131
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.478
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.234
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major

Concerto grosso no.1 (1976-77): 5. Rondo: Agitato
type: MusicRecording
duration: PT7M7S
duration ms: 427573
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
isrc code: DEF058803645
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-24T15:38:33+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x635576cbf83e43f01152ca8aa9420cd2ce6fce311c6412db815f7827bd335b79
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058803645
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
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: 956304
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-02T03:55:08+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 0x635576cbf83e43f01152ca8aa9420cd2ce6fce311c6412db815f7827bd335b79. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEF058803645.
  date published: 2026-07-02T03:55:08Z
audio: Concerto grosso no.1 (1976-77): 5. Rondo: Agitato
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 143.996
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.362
  additional property: Energy
    type: PropertyValue
    value: 0.404
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.895
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.864
  additional property: Liveness
    type: PropertyValue
    value: 0.13
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.153
  additional property: Loudness (dB)
    type: PropertyValue
    value: -17.384
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Concerto grosso no.1 (1976-77): 3. Recitativo: Lento
type: MusicRecording
duration: PT6M54S
duration ms: 414600
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09d07ec7be9e504a02f5674c55b3638e88fe422c3239e7ee19fd9ada756f486. 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/DEF058803643.
  date published: 2026-07-29T21:09:47Z
audio: Concerto grosso no.1 (1976-77): 3. Recitativo: Lento
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 92.95
  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: 0.085
  additional property: Energy
    type: PropertyValue
    value: 0.165
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.903
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.677
  additional property: Liveness
    type: PropertyValue
    value: 0.143
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.032
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.87
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF058803643
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: 960144
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-29T21:09:47+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058803643
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: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T21:09:47+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

Concerto grosso no.1 (1976-77): 4. Cadenza (without tempo marking)
type: MusicRecording
duration: PT2M31S
duration ms: 151426
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef1a03862c9a07743d3e95470916484983a03fa4be28e1c4eb722f4ce5b0f18. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEF058803644.
  date published: 2026-07-30T09:57:33Z
audio: Concerto grosso no.1 (1976-77): 4. Cadenza (without tempo marking)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 115.317
  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: 0.468
  additional property: Energy
    type: PropertyValue
    value: 0.117
  additional property: Speechiness
    type: PropertyValue
    value: 0.147
  additional property: Acousticness
    type: PropertyValue
    value: 0.897
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.203
  additional property: Liveness
    type: PropertyValue
    value: 0.258
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.105
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.054
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF058803644
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: 960240
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T09:57:33+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058803644
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960240
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960240
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T09:57:33+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

Concerto grosso no.1 (1976-77): 6. Postludio: Andante - Allegro - Andante
type: MusicRecording
duration: PT2M8S
duration ms: 128000
explicit: false
by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Tatiana Grindenko
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
by artist: Heinrich Schiff
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
  type: MusicAlbum
  date published: 1986-01-01
genre: minimalism
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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audio: Concerto grosso no.1 (1976-77): 6. Postludio: Andante - Allegro - Andante
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Quasi una sonata (1987) For Violin And Chamber Orchestra
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by artist: Alfred Schnittke
by artist: Gidon Kremer
by artist: Yuri Smirnov
by artist: Chamber Orchestra of Europe
in album: Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
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genre: minimalism
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  date published: 2026-07-31T00:58:21Z
audio: Quasi una sonata (1987) For Violin And Chamber Orchestra
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