KatKz
type: MusicGroup
popularity: 8
followers: 217
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x05ed3eac4998393c49dd25d9af51cb73645fd10cc4857c78c89c2827cc17d5b3
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/9f406197-9d84-44e7-8dc5-63b137023fca.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9f406197-9d84-44e7-8dc5-63b137023fca.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9f406197-9d84-44e7-8dc5-63b137023fca
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T06:31:18Z
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 0x05ed3eac4998393c49dd25d9af51cb73645fd10cc4857c78c89c2827cc17d5b3. 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/9f406197-9d84-44e7-8dc5-63b137023fca.json and https://artists.proofprofile.net/proofs/artist/9f406197-9d84-44e7-8dc5-63b137023fca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T06:31:18Z
album: Energy
  type: MusicAlbum
  date published: 2019-04-14
album: Last
  type: MusicAlbum
  date published: 2021-09-21
album: Go!
  type: MusicAlbum
  date published: 2021-11-07
album: Tornado
  type: MusicAlbum
  date published: 2021-12-26
album: Hope
  type: MusicAlbum
  date published: 2022-03-18
album: Campfire
  type: MusicAlbum
  date published: 2022-05-20
album: Powder
  type: MusicAlbum
  date published: 2022-11-25
album: Future
  type: MusicAlbum
  date published: 2022-12-07
  track: Future
    type: MusicRecording
    duration: PT3M41S
    duration ms: 221548
    explicit: false
    by artist: KatKz
    in album: Future
      type: MusicAlbum
      date published: 2022-12-07
    isrc code: GX8LD2202856
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T12:50:23+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x20713b85a3db9991474884eebab3879e1ff094ef213bb81b8425e818e686d689
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956826
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956826
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX8LD2202856
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T19:27:56Z
    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 0x20713b85a3db9991474884eebab3879e1ff094ef213bb81b8425e818e686d689. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GX8LD2202856.
      date published: 2026-07-05T19:27:56Z
    audio: Future
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 115.009
      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: 0.677
      additional property: Energy
        type: PropertyValue
        value: 0.664
      additional property: Speechiness
        type: PropertyValue
        value: 0.036
      additional property: Acousticness
        type: PropertyValue
        value: 0.006
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.203
      additional property: Liveness
        type: PropertyValue
        value: 0.192
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.177
      additional property: Loudness (dB)
        type: PropertyValue
        value: -10.039
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Walking Together
  type: MusicAlbum
  date published: 2023-01-04
album: Gaze
  type: MusicAlbum
  date published: 2023-02-03
album: Fusion
  type: MusicAlbum
  date published: 2023-02-03
album: Vanish
  type: MusicAlbum
  date published: 2023-06-30
album: Sky
  type: MusicAlbum
  date published: 2023-10-06
album: Warm
  type: MusicAlbum
  date published: 2023-12-15
album: Superpowers
  type: MusicAlbum
  date published: 2024-04-05
  track: Superpowers
    type: MusicRecording
    duration: PT2M29S
    duration ms: 149315
    explicit: false
    by artist: KatKz
    in album: Superpowers
      type: MusicAlbum
      date published: 2024-04-05
    isrc code: GX8LD2415730
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T14:56:30+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf10c86337b4283cddc15c6cf7af4c740e80fe53ce140fdda0b3c5d3b21d204cd
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959023
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959023
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX8LD2415730
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T15:22:58Z
    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 0xf10c86337b4283cddc15c6cf7af4c740e80fe53ce140fdda0b3c5d3b21d204cd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GX8LD2415730.
      date published: 2026-07-21T15:22:58Z
    audio: Superpowers
album: Bright
album: Dimness
album: Love Story
album: 忘レモノ

Superpowers
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 140.094
additional property: Musical Key
  type: PropertyValue
  value: 1
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.529
additional property: Energy
  type: PropertyValue
  value: 0.826
additional property: Speechiness
  type: PropertyValue
  value: 0.04
additional property: Acousticness
  type: PropertyValue
  value: 0.002
additional property: Instrumentalness
  type: PropertyValue
  value: 0.889
additional property: Liveness
  type: PropertyValue
  value: 0.285
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.583
additional property: Loudness (dB)
  type: PropertyValue
  value: -9.49
additional property: Key Name
  type: PropertyValue
  value: C#
additional property: Mode Name
  type: PropertyValue
  value: Minor

Bright
type: MusicAlbum
date published: 2024-04-24

Dimness
type: MusicAlbum
date published: 2024-05-02

Love Story
type: MusicAlbum
date published: 2024-08-18

忘レモノ
type: MusicAlbum
date published: 2025-01-31