Challenger
type: MusicGroup
genre: heavy metal
genre: speed metal
popularity: 6
followers: 652
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x104ae144bd783e32eccf697742c641aeb04bdce6ae87d90ff151a666b4e91e1f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/df2a1528-f37e-4540-836b-f49f4589415d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/df2a1528-f37e-4540-836b-f49f4589415d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/df2a1528-f37e-4540-836b-f49f4589415d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
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 0x104ae144bd783e32eccf697742c641aeb04bdce6ae87d90ff151a666b4e91e1f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df2a1528-f37e-4540-836b-f49f4589415d.json and https://artists.proofprofile.net/proofs/artist/df2a1528-f37e-4540-836b-f49f4589415d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
album: Turned to Dust
  type: MusicAlbum
  date published: 2019-03-29
album: Imperial Madness
  type: MusicAlbum
  date published: 2024-08-07
album: Victims of War
  type: MusicAlbum
  date published: 2024-09-11
album: Sleepless
  type: MusicAlbum
  date published: 2024-10-02
album: Force of Nature
  type: MusicAlbum
  date published: 2024-10-25
  track: Imperial Madness
    type: MusicRecording
    duration: PT4M53S
    duration ms: 293600
    explicit: false
    by artist: Challenger
    in album: Force of Nature
      type: MusicAlbum
      date published: 2024-10-25
    genre: heavy metal
    genre: speed metal
    isrc code: QM7282482054
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-22T00:14:31+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xeb1f4bd0597c00123f1a050bba327bc60d0685cc29fbb4eb17fe11e5657970e1
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959084
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959084
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM7282482054
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T00:50:00Z
    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 0xeb1f4bd0597c00123f1a050bba327bc60d0685cc29fbb4eb17fe11e5657970e1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QM7282482054.
      date published: 2026-07-22T00:50:00Z
    audio: Imperial Madness
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 149.856
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.398
      additional property: Energy
        type: PropertyValue
        value: 0.947
      additional property: Speechiness
        type: PropertyValue
        value: 0.108
      additional property: Acousticness
        type: PropertyValue
        value: 0.001
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.513
      additional property: Liveness
        type: PropertyValue
        value: 0.121
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.203
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.292
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor