P21
type: MusicGroup
genre: portuguese hip hop
description: p21Cip1 (alternatively p21Waf1), also known as cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1, is a cyclin-dependent kinase inhibitor (CKI) that is capable of inhibiting all cyclin/
popularity: 3
followers: 188
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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  type: PropertyValue
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additional property: OTSCanonicalRecord
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 0x292dba536a954252cc259813c184a06402a959ade130147e041e85ba8e0fccd8. 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/ac522c0b-548d-4174-b059-85dc2c0edaea.json and https://artists.proofprofile.net/proofs/artist/ac522c0b-548d-4174-b059-85dc2c0edaea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T11:51:30Z
album: A Mensagem
  type: MusicAlbum
  date published: 2020-11-11
album: Lado Louco
  type: MusicAlbum
  date published: 2021-02-03
album: Focado
  type: MusicAlbum
  date published: 2021-05-19
album: Rainha ao Peito
  type: MusicAlbum
  date published: 2021-05-20
album: Faz Sentido
  type: MusicAlbum
  date published: 2021-08-20
album: Sempre Igual
  type: MusicAlbum
  date published: 2021-10-14
album: Conselho meu
  type: MusicAlbum
  date published: 2021-11-10
album: Society
  type: MusicAlbum
  date published: 2021-12-11
album: Puff Puff
  type: MusicAlbum
  date published: 2022-05-23
album: 100 Ti
  type: MusicAlbum
  date published: 2022-10-21
album: 2000
  type: MusicAlbum
  date published: 2022-11-17
album: É isto que eu quero
  type: MusicAlbum
  date published: 2023-05-23
album: Não Vai Dar
  type: MusicAlbum
  date published: 2023-06-13
album: Rolls Royce
  type: MusicAlbum
  date published: 2023-07-22
album: VRUM VRUM
  type: MusicAlbum
  date published: 2023-10-27
album: Viver a Vida
  type: MusicAlbum
  date published: 2023-12-24
album: BOM SENTIDO
  type: MusicAlbum
  date published: 2024-04-07
  track: BOM SENTIDO
    type: MusicRecording
    duration: PT3M22S
    duration ms: 202500
    explicit: true
    by artist: P21
    in album: BOM SENTIDO
      type: MusicAlbum
      date published: 2024-04-07
    genre: portuguese hip hop
    isrc code: PT7ED2400982
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
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    additional property: CopyrightRegisteredAt
      type: PropertyValue
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    additional property: OTSBitcoinBlock
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    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958870
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PT7ED2400982
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T13:45:30Z
    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 0x93fa6afa79b9f41e24cf33c4dac1f7143011837ca18f388a89cb4424cd8076e4. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T13:45:30Z), 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/PT7ED2400982.
      date published: 2026-07-20T13:45:30Z
    audio: BOM SENTIDO
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 92.01
      additional property: Musical Key
        type: PropertyValue
        value: 1
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.779
      additional property: Energy
        type: PropertyValue
        value: 0.669
      additional property: Speechiness
        type: PropertyValue
        value: 0.189
      additional property: Acousticness
        type: PropertyValue
        value: 0.51
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.107
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.479
      additional property: Loudness (dB)
        type: PropertyValue
        value: -6.735
      additional property: Key Name
        type: PropertyValue
        value: C#
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: NO RELAX
  type: MusicAlbum
  date published: 2024-08-31
album: HOJE EU TOU BEM
  type: MusicAlbum
  date published: 2024-08-31
album: SOLDADOS DA RAINHA
  type: MusicAlbum
  date published: 2025-04-10
album: Não me importa
  type: MusicAlbum
  date published: 2025-08-12