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type: MusicGroup
genre: chamber music
popularity: 8
followers: 31
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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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56821f555b4757249161c735477a7e1dabd6fe8fcbfc830500ea91515e9de42. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bd91667-e58f-4529-9669-7879174aa580.json and https://artists.proofprofile.net/proofs/artist/0bd91667-e58f-4529-9669-7879174aa580.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T04:37:45Z
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track: Flute Quartet in D Major, K. 285: I. ﻿Allegro
track: Flute Quartet in D Major, K. 285: II. ﻿Adagio
track: Flute Quartet in D Major, K. 285: III. ﻿Rondeau

Flute Quartet in D Major, K. 285: I. ﻿Allegro
type: MusicRecording
duration: PT6M50S
duration ms: 410906
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: ﻿Karel Valter
by artist: Pablo Valetti
by artist: Peter Biely
by artist: Petr Skalka
by artist: Karel Valter
in album: Mozart: Flute Quartets
  type: MusicAlbum
  date published: 2019-10-04
genre: classical
genre: classical-era
isrc code: DEFG21928531
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: OTSVerificationAPI
  type: PropertyValue
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T13:32:09+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
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additional property: BitcoinTime
  type: PropertyValue
  value: 2026-06-13T13:32:09+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 0x01e06b34398f0117162c85a44e6d6d9ad7b63c130ea42d1e1e38d7ec383ea179. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEFG21928531.
  date published: 2026-06-13T17:25:41Z
audio: Flute Quartet in D Major, K. 285: I. ﻿Allegro
  type: AudioObject
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  additional property: Time Signature
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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
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  additional property: Instrumentalness
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  additional property: Valence (Positivity)
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Flute Quartet in D Major, K. 285: II. ﻿Adagio
type: MusicRecording
duration: PT2M52S
duration ms: 172493
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: ﻿Karel Valter
by artist: Pablo Valetti
by artist: Peter Biely
by artist: Petr Skalka
by artist: Karel Valter
in album: Mozart: Flute Quartets
  type: MusicAlbum
  date published: 2019-10-04
genre: classical
genre: classical-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f9e9e0ea3adbebb8fced7cfd0e9237022cd7825f840e281b533c0fbb0a3ad1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEFG21928532.
  date published: 2026-07-31T23:30:38Z
audio: Flute Quartet in D Major, K. 285: II. ﻿Adagio
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  additional property: Speechiness
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isrc code: DEFG21928532
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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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 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

Flute Quartet in D Major, K. 285: III. ﻿Rondeau
type: MusicRecording
duration: PT4M29S
duration ms: 269333
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: ﻿Karel Valter
by artist: Pablo Valetti
by artist: Peter Biely
by artist: Petr Skalka
by artist: Karel Valter
in album: Mozart: Flute Quartets
  type: MusicAlbum
  date published: 2019-10-04
genre: classical
genre: classical-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32f6a42e882532ef55f38ed14d6404ca4962e49e417911cd1563d08438d9804. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEFG21928533.
  date published: 2026-08-01T02:22:04Z
audio: Flute Quartet in D Major, K. 285: III. ﻿Rondeau
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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isrc code: DEFG21928533
additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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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 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