JEF Crew
type: MusicGroup
genre: christian hip hop
popularity: 6
followers: 1186
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x08240ff056994631cbda7127c22cfdd49e2aedc2c6a1d156a3b214a06dd7b9e6
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/66f84a46-d9e8-4608-a3c0-1f254da741db.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/66f84a46-d9e8-4608-a3c0-1f254da741db.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/66f84a46-d9e8-4608-a3c0-1f254da741db
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x08240ff056994631cbda7127c22cfdd49e2aedc2c6a1d156a3b214a06dd7b9e6","name":"JEF Crew","registered_at":"2026-06-17T01:28:32Z","symbol":"NIM1238182","token_address":"0xda5d3cdba1535bcf938973e1c33b904f98588131","type":"artist","uuid":"66f84a46-d9e8-4608-a3c0-1f254da741db"}
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 0x08240ff056994631cbda7127c22cfdd49e2aedc2c6a1d156a3b214a06dd7b9e6. 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/66f84a46-d9e8-4608-a3c0-1f254da741db.json and https://artists.proofprofile.net/proofs/artist/66f84a46-d9e8-4608-a3c0-1f254da741db.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x08240ff056994631cbda7127c22cfdd49e2aedc2c6a1d156a3b214a06dd7b9e6","name":"JEF Crew","registered_at":"2026-06-17T01:28:32Z","symbol":"NIM1238182","token_address":"0xda5d3cdba1535bcf938973e1c33b904f98588131","type":"artist","uuid":"66f84a46-d9e8-4608-a3c0-1f254da741db"}
album: El Mejor Vino
  type: MusicAlbum
  date published: 2018-02-19
album: El Evangelio Cambia
  type: MusicAlbum
  date published: 2018-02-28
  track: Nadie Te Ama Como Jesús
    type: MusicRecording
    duration: PT3M37S
    duration ms: 217848
    explicit: false
    by artist: JEF Crew
    in album: El Evangelio Cambia
      type: MusicAlbum
      date published: 2018-02-28
    genre: christian hip hop
    isrc code: QMEZE1817412
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T09:24:38+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x84dc65f9247b2673203ab62af79188231d9e456d9e71c7dd052eac23cfff71a0
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956656
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956656
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEZE1817412
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T14:03:39Z
    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 0x84dc65f9247b2673203ab62af79188231d9e456d9e71c7dd052eac23cfff71a0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QMEZE1817412.
      date published: 2026-07-04T14:03:39Z
    audio: Nadie Te Ama Como Jesús
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 78.577
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.628
      additional property: Energy
        type: PropertyValue
        value: 0.611
      additional property: Speechiness
        type: PropertyValue
        value: 0.12
      additional property: Acousticness
        type: PropertyValue
        value: 0.601
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.082
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.55
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.923
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Jesús Trae Esperanza
  type: MusicAlbum
  date published: 2018-08-13
album: No Podrán
  type: MusicAlbum
  date published: 2018-10-25
album: Lacreo
  type: MusicAlbum
  date published: 2020-04-10