Quartet Brossa
type: MusicGroup
popularity: 8
followers: 357
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x034271837392c2f4cfbbe628cf5dac5cb85e6fb45beab2fdea653f5305af9586
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4a5da822-b098-4bf7-a92c-ca0d5a5d1296.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4a5da822-b098-4bf7-a92c-ca0d5a5d1296.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4a5da822-b098-4bf7-a92c-ca0d5a5d1296
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x034271837392c2f4cfbbe628cf5dac5cb85e6fb45beab2fdea653f5305af9586","name":"Quartet Brossa","registered_at":"2026-06-16T15:29:12Z","symbol":"NIM1095203","token_address":"0x9ae592f1c23905564dc0a2eef829d2fcc385b14b","type":"artist","uuid":"4a5da822-b098-4bf7-a92c-ca0d5a5d1296"}
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 0x034271837392c2f4cfbbe628cf5dac5cb85e6fb45beab2fdea653f5305af9586. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a5da822-b098-4bf7-a92c-ca0d5a5d1296.json and https://artists.proofprofile.net/proofs/artist/4a5da822-b098-4bf7-a92c-ca0d5a5d1296.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x034271837392c2f4cfbbe628cf5dac5cb85e6fb45beab2fdea653f5305af9586","name":"Quartet Brossa","registered_at":"2026-06-16T15:29:12Z","symbol":"NIM1095203","token_address":"0x9ae592f1c23905564dc0a2eef829d2fcc385b14b","type":"artist","uuid":"4a5da822-b098-4bf7-a92c-ca0d5a5d1296"}
album: Músiques de L'Holocaust
  type: MusicAlbum
  date published: 2009-05-05
album: Cançons dels brigadistes
  type: MusicAlbum
  date published: 2010-07-22
  track: Bella Ciao
    type: MusicRecording
    duration: PT3M59S
    duration ms: 239653
    explicit: false
    by artist: Quartet Brossa
    in album: Cançons dels brigadistes
      type: MusicAlbum
      date published: 2010-07-22
    isrc code: ES8511303903
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T12:10:46+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x090c89fed47a76be1539d43ac1cf626e154e6536a91bc2f6b94ec85f0bac5fea
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958286
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958286
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES8511303903
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-16T12:43:37Z
    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 0x090c89fed47a76be1539d43ac1cf626e154e6536a91bc2f6b94ec85f0bac5fea. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES8511303903.
      date published: 2026-07-16T12:43:37Z
    audio: Bella Ciao
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 143.47
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.486
      additional property: Energy
        type: PropertyValue
        value: 0.512
      additional property: Speechiness
        type: PropertyValue
        value: 0.063
      additional property: Acousticness
        type: PropertyValue
        value: 0.652
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.092
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.445
      additional property: Loudness (dB)
        type: PropertyValue
        value: -6.566
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Viatge d'hivern de Franz Schubert
  type: MusicAlbum
  date published: 2014-10-29
album: Dimitri's Madness
  type: MusicAlbum
  date published: 2020-03-13
album: Folkestral
  type: MusicAlbum
  date published: 2021-03-12