Hef
type: MusicGroup
description: Hef or HEF may refer to: Hef (rapper), Julliard Frans (born 1987), Dutch rapper Hefeweizen, a type of beer Herefordshire, county in England, Chapman code High-energy fuel, an experimental aircraf
popularity: 5
followers: 231
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x65a7cbb25cd8e6b698c1c6f078ba75c056265980fd2f16c909f7f2382c37120b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953938
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953938
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/200169dd-fff5-40b5-bcfe-deb480eab014.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/200169dd-fff5-40b5-bcfe-deb480eab014.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/200169dd-fff5-40b5-bcfe-deb480eab014
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T11:35:56Z
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a7cbb25cd8e6b698c1c6f078ba75c056265980fd2f16c909f7f2382c37120b. Chain 2 (Bitcoin): anchored in block 953938 (2026-06-16T11:35:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/200169dd-fff5-40b5-bcfe-deb480eab014.json and https://artists.proofprofile.net/proofs/artist/200169dd-fff5-40b5-bcfe-deb480eab014.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T11:35:56Z
album: Out of the Mix
  type: MusicAlbum
  date published: 2023-01-21
album: Out Of The Mix
  type: MusicAlbum
  date published: 2023-01-21
album: Unusual
  type: MusicAlbum
  date published: 2023-05-18
album: Peace of Mind
  type: MusicAlbum
  date published: 2023-11-17
album: Outcast
  type: MusicAlbum
  date published: 2024-05-09
album: Just Friends
  type: MusicAlbum
  date published: 2024-08-23
  track: Just Friends
    type: MusicRecording
    duration: PT2M52S
    duration ms: 172800
    explicit: true
    by artist: Hef
    in album: Just Friends
      type: MusicAlbum
      date published: 2024-08-23
    isrc code: GBMA22365652
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T03:49:11+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd6db50804610a9307cb769382542949fb01192878829c8c660961e7cac5f9233
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958362
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958362
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMA22365652
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T04:32:48Z
    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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6db50804610a9307cb769382542949fb01192878829c8c660961e7cac5f9233. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GBMA22365652.
      date published: 2026-07-17T04:32:48Z
    audio: Just Friends
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 149.887
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.575
      additional property: Energy
        type: PropertyValue
        value: 0.674
      additional property: Speechiness
        type: PropertyValue
        value: 0.074
      additional property: Acousticness
        type: PropertyValue
        value: 0.346
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.099
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.393
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.206
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Major