Håkan Mattjus
type: MusicGroup
popularity: 2
followers: 2
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4557940d769095a4be88cc8c8ae74ff9e120fbfe85f6e78c39b31ebc3959c578
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954513
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954513
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9f9d931a-8bb8-4346-be00-34d705f0af27.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9f9d931a-8bb8-4346-be00-34d705f0af27.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9f9d931a-8bb8-4346-be00-34d705f0af27
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T06:31:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x4557940d769095a4be88cc8c8ae74ff9e120fbfe85f6e78c39b31ebc3959c578","name":"Håkan Mattjus","registered_at":"2026-06-20T05:13:21Z","symbol":"NIM1522586","token_address":"0x5fa66aaccb0fa4836d83bcdc3a44051a525ebd9a","type":"artist","uuid":"9f9d931a-8bb8-4346-be00-34d705f0af27"}
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 0x4557940d769095a4be88cc8c8ae74ff9e120fbfe85f6e78c39b31ebc3959c578. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f9d931a-8bb8-4346-be00-34d705f0af27.json and https://artists.proofprofile.net/proofs/artist/9f9d931a-8bb8-4346-be00-34d705f0af27.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T06:31:18Z
  text: {"copyright_id":"0x4557940d769095a4be88cc8c8ae74ff9e120fbfe85f6e78c39b31ebc3959c578","name":"Håkan Mattjus","registered_at":"2026-06-20T05:13:21Z","symbol":"NIM1522586","token_address":"0x5fa66aaccb0fa4836d83bcdc3a44051a525ebd9a","type":"artist","uuid":"9f9d931a-8bb8-4346-be00-34d705f0af27"}
album: Amazing Grace
  type: MusicAlbum
  date published: 2025-06-06
  track: Amazing Grace
    type: MusicRecording
    duration: PT3M21S
    duration ms: 201018
    explicit: false
    by artist: Håkan Mattjus
    in album: Amazing Grace
      type: MusicAlbum
      date published: 2025-06-06
    isrc code: FITE63900662
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T02:32:03+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x9fed331d96b4e34c28efb5db17ffc40c697a1b6fa831ff6edc0a153291bfc196
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958650
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958650
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FITE63900662
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T03:36:41Z
    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 0x9fed331d96b4e34c28efb5db17ffc40c697a1b6fa831ff6edc0a153291bfc196. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FITE63900662.
      date published: 2026-07-19T03:36:41Z
    audio: Amazing Grace
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 112.289
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.291
      additional property: Energy
        type: PropertyValue
        value: 0.349
      additional property: Speechiness
        type: PropertyValue
        value: 0.03
      additional property: Acousticness
        type: PropertyValue
        value: 0.147
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.92
      additional property: Liveness
        type: PropertyValue
        value: 0.148
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.348
      additional property: Loudness (dB)
        type: PropertyValue
        value: -10.147
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major