Merel Quartet
type: MusicGroup
genre: chamber music
popularity: 5
followers: 93
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xaea8dc611a502b6a36c79aaac54ed941dbc0425b7661764fba7f16ab3ddefb3b
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 954553
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954553
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ac01d4eb-017e-4c05-9cd3-e4d95b57af3c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ac01d4eb-017e-4c05-9cd3-e4d95b57af3c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ac01d4eb-017e-4c05-9cd3-e4d95b57af3c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T11:51:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xaea8dc611a502b6a36c79aaac54ed941dbc0425b7661764fba7f16ab3ddefb3b","name":"Merel Quartet","registered_at":"2026-06-20T09:49:57Z","symbol":"NIM1584322","token_address":"0x995303fe2fbabb3863497daede315ed6575a3cab","type":"artist","uuid":"ac01d4eb-017e-4c05-9cd3-e4d95b57af3c"}
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 0xaea8dc611a502b6a36c79aaac54ed941dbc0425b7661764fba7f16ab3ddefb3b. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac01d4eb-017e-4c05-9cd3-e4d95b57af3c.json and https://artists.proofprofile.net/proofs/artist/ac01d4eb-017e-4c05-9cd3-e4d95b57af3c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T11:51:30Z
  text: {"copyright_id":"0xaea8dc611a502b6a36c79aaac54ed941dbc0425b7661764fba7f16ab3ddefb3b","name":"Merel Quartet","registered_at":"2026-06-20T09:49:57Z","symbol":"NIM1584322","token_address":"0x995303fe2fbabb3863497daede315ed6575a3cab","type":"artist","uuid":"ac01d4eb-017e-4c05-9cd3-e4d95b57af3c"}
album: Strings Quartets by Felix & Fanny Mendelssohn
  type: MusicAlbum
  date published: 2011-05-03
  track: String Quartet in E-Flat Major: I. Adagio ma non troppo
    type: MusicRecording
    duration: PT3M57S
    duration ms: 237733
    explicit: false
    by artist: Merel Quartet
    in album: Strings Quartets by Felix & Fanny Mendelssohn
      type: MusicAlbum
      date published: 2011-05-03
    genre: chamber music
    isrc code: DET900920405
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T20:39:14+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd93a9f64f5d09bb0df9a617d5f01b79afd260de2017165ccd7b2d7626df18e1e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
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      value: 958690
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958690
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET900920405
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T07:14:39Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93a9f64f5d09bb0df9a617d5f01b79afd260de2017165ccd7b2d7626df18e1e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DET900920405.
      date published: 2026-07-19T07:14:39Z
    audio: String Quartet in E-Flat Major: I. Adagio ma non troppo
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 95.39
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.179
      additional property: Energy
        type: PropertyValue
        value: 0.131
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.932
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.301
      additional property: Liveness
        type: PropertyValue
        value: 0.083
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.04
      additional property: Loudness (dB)
        type: PropertyValue
        value: -21.726
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Strings Quartets by Felix & Fanny Mendelssohn
  type: MusicAlbum
  date published: 2011-05-03