Cal Williams Jr
type: MusicGroup
genre: blues
genre: modern blues
popularity: 5
followers: 555
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0efae3f75b54232f89f9a36b0b1a11c0b2ed1731239bb139cb6b47e773b89d68
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/5f561a8a-2e3c-4be0-9abb-a1d1363c36ad.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5f561a8a-2e3c-4be0-9abb-a1d1363c36ad.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/5f561a8a-2e3c-4be0-9abb-a1d1363c36ad
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0efae3f75b54232f89f9a36b0b1a11c0b2ed1731239bb139cb6b47e773b89d68","name":"Cal Williams Jr","registered_at":"2026-06-16T22:53:35Z","symbol":"NIM1201222","token_address":"0x65beee5a112410f77a2edef411c5a9b2014dc267","type":"artist","uuid":"5f561a8a-2e3c-4be0-9abb-a1d1363c36ad"}
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 0x0efae3f75b54232f89f9a36b0b1a11c0b2ed1731239bb139cb6b47e773b89d68. 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/5f561a8a-2e3c-4be0-9abb-a1d1363c36ad.json and https://artists.proofprofile.net/proofs/artist/5f561a8a-2e3c-4be0-9abb-a1d1363c36ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x0efae3f75b54232f89f9a36b0b1a11c0b2ed1731239bb139cb6b47e773b89d68","name":"Cal Williams Jr","registered_at":"2026-06-16T22:53:35Z","symbol":"NIM1201222","token_address":"0x65beee5a112410f77a2edef411c5a9b2014dc267","type":"artist","uuid":"5f561a8a-2e3c-4be0-9abb-a1d1363c36ad"}
album: All That I Learned From the Sea
  type: MusicAlbum
  date published: 2010-08-26
album: King Billy
  type: MusicAlbum
  date published: 2011-10-22
album: Little Black Crow
  type: MusicAlbum
  date published: 2013-11-24
  track: Hard Times a-Comin'
    type: MusicRecording
    duration: PT4M59S
    duration ms: 299547
    explicit: false
    by artist: Cal Williams Jr
    in album: Little Black Crow
      type: MusicAlbum
      date published: 2013-11-24
    genre: blues
    genre: modern blues
    isrc code: USX9P1301024
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T03:54:52+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x05661a0c550e5fad1460666a701362bf471439169871547ea8c794a626765222
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958363
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958363
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1301024
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T04:34:46Z
    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 0x05661a0c550e5fad1460666a701362bf471439169871547ea8c794a626765222. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/USX9P1301024.
      date published: 2026-07-17T04:34:46Z
    audio: Hard Times a-Comin'
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 90.887
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.42
      additional property: Energy
        type: PropertyValue
        value: 0.204
      additional property: Speechiness
        type: PropertyValue
        value: 0.032
      additional property: Acousticness
        type: PropertyValue
        value: 0.708
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.221
      additional property: Liveness
        type: PropertyValue
        value: 0.094
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.393
      additional property: Loudness (dB)
        type: PropertyValue
        value: -15.241
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Chickasaw
  type: MusicAlbum
  date published: 2021-11-21
album: Statesboro' Blues
  type: MusicAlbum
  date published: 2022-11-20
album: Luma
  type: MusicAlbum
  date published: 2024-05-06
album: Bearclaw
  type: MusicAlbum
  date published: 2024-11-21