Hard Head Collective
type: MusicGroup
popularity: 3
followers: 601
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x104bbcd034330970a99b9b4eca55bd2e8b42efa63dc3265f846e97237da75736
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x104bbcd034330970a99b9b4eca55bd2e8b42efa63dc3265f846e97237da75736","name":"Hard Head Collective","registered_at":"2026-06-17T19:32:21Z","symbol":"NIM1496677","token_address":"0x26d7f5da7620ae90f7e7aa036ce484108f066fa4","type":"artist","uuid":"9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd"}
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 0x104bbcd034330970a99b9b4eca55bd2e8b42efa63dc3265f846e97237da75736. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd.json and https://artists.proofprofile.net/proofs/artist/9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x104bbcd034330970a99b9b4eca55bd2e8b42efa63dc3265f846e97237da75736","name":"Hard Head Collective","registered_at":"2026-06-17T19:32:21Z","symbol":"NIM1496677","token_address":"0x26d7f5da7620ae90f7e7aa036ce484108f066fa4","type":"artist","uuid":"9a58a97a-158b-4665-a1c3-f1c0a0b8e0cd"}
album: HARDHEADDEADBOYZ
  type: MusicAlbum
  date published: 2023-10-13
album: HOLDAP!
  type: MusicAlbum
  date published: 2023-10-20
album: KARAVAN!
  type: MusicAlbum
  date published: 2024-06-08
album: Mary's
  type: MusicAlbum
  date published: 2024-07-12
album: SAYAWA
  type: MusicAlbum
  date published: 2024-12-30
album: HONGCHA
  type: MusicAlbum
  date published: 2025-04-18
  track: HONGCHA
    type: MusicRecording
    duration: PT5M10S
    duration ms: 310786
    explicit: true
    by artist: Hard Head Collective
    in album: HONGCHA
      type: MusicAlbum
      date published: 2025-04-18
    isrc code: QZMEM2594708
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T16:39:25+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xec3ec6b972292e7b3c3055e6010c4554bc4c625687794db8bb59b58972475ff3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958582
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958582
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2594708
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T16:47:25Z
    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 0xec3ec6b972292e7b3c3055e6010c4554bc4c625687794db8bb59b58972475ff3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZMEM2594708.
      date published: 2026-07-18T16:47:25Z
    audio: HONGCHA
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 177.73
      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: 0.314
      additional property: Energy
        type: PropertyValue
        value: 0.625
      additional property: Speechiness
        type: PropertyValue
        value: 0.2
      additional property: Acousticness
        type: PropertyValue
        value: 0.357
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.342
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.926
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.251
      additional property: Key Name
        type: PropertyValue
        value: C#
      additional property: Mode Name
        type: PropertyValue
        value: Major