Os Negrinhos
type: MusicGroup
genre: afro house
genre: kuduro
popularity: 3
followers: 801
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9f7c9650d74dd682d6688ddb416528d794b0b935fc4bcffa32bd06c30b713dfe
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6c93ad91-e429-42a7-9817-ef0b05b56b34.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6c93ad91-e429-42a7-9817-ef0b05b56b34.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/6c93ad91-e429-42a7-9817-ef0b05b56b34
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x9f7c9650d74dd682d6688ddb416528d794b0b935fc4bcffa32bd06c30b713dfe","name":"Os Negrinhos","registered_at":"2026-06-17T03:29:29Z","symbol":"NIM1267042","token_address":"0x177778a0ef675e72251db0a9dfd1939ade4d783d","type":"artist","uuid":"6c93ad91-e429-42a7-9817-ef0b05b56b34"}
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 0x9f7c9650d74dd682d6688ddb416528d794b0b935fc4bcffa32bd06c30b713dfe. 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/6c93ad91-e429-42a7-9817-ef0b05b56b34.json and https://artists.proofprofile.net/proofs/artist/6c93ad91-e429-42a7-9817-ef0b05b56b34.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x9f7c9650d74dd682d6688ddb416528d794b0b935fc4bcffa32bd06c30b713dfe","name":"Os Negrinhos","registered_at":"2026-06-17T03:29:29Z","symbol":"NIM1267042","token_address":"0x177778a0ef675e72251db0a9dfd1939ade4d783d","type":"artist","uuid":"6c93ad91-e429-42a7-9817-ef0b05b56b34"}
album: Foquera
  type: MusicAlbum
  date published: 2015-08-11
album: Ta Andar Tipo Pato
  type: MusicAlbum
  date published: 2018-04-02
album: Ai Coração
  type: MusicAlbum
  date published: 2018-10-15
album: Pé no Pivão
  type: MusicAlbum
  date published: 2019-11-15
album: Pé no Pivão
  type: MusicAlbum
  date published: 2019-11-16
  track: Pé no Pivão
    type: MusicRecording
    duration: PT3M20S
    duration ms: 200672
    explicit: false
    by artist: Os Negrinhos
    in album: Pé no Pivão
      type: MusicAlbum
      date published: 2019-11-16
    genre: afro house
    genre: kuduro
    isrc code: ES71G1944087
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T04:37:59+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xa837440e1aba65a38b7d41455fb783269791f6cf4040c2ec239237c29a1202fb
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956772
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956772
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1944087
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:01:46Z
    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 0xa837440e1aba65a38b7d41455fb783269791f6cf4040c2ec239237c29a1202fb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES71G1944087.
      date published: 2026-07-05T10:01:46Z
    audio: Pé no Pivão
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 126.992
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.971
      additional property: Energy
        type: PropertyValue
        value: 0.641
      additional property: Speechiness
        type: PropertyValue
        value: 0.201
      additional property: Acousticness
        type: PropertyValue
        value: 0.029
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.013
      additional property: Liveness
        type: PropertyValue
        value: 0.092
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.546
      additional property: Loudness (dB)
        type: PropertyValue
        value: -6.959
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Bekere
  type: MusicAlbum
  date published: 2020-12-28