TaKU.K
type: MusicGroup
genre: vocaloid
popularity: 13
followers: 2011
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe7392eb5df1f0016f340feb721f13413fc37eef25337d79708ec51a946ad3bfa
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953625
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953625
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2af7cc21-be4b-40e4-868f-a7ef74dd373e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2af7cc21-be4b-40e4-868f-a7ef74dd373e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2af7cc21-be4b-40e4-868f-a7ef74dd373e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T11:37:06Z
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7392eb5df1f0016f340feb721f13413fc37eef25337d79708ec51a946ad3bfa. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2af7cc21-be4b-40e4-868f-a7ef74dd373e.json and https://artists.proofprofile.net/proofs/artist/2af7cc21-be4b-40e4-868f-a7ef74dd373e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T11:37:06Z
album: マトカリアの手帳は飴色を知らない
  type: MusicAlbum
  date published: 2015-12-18
album: 189g
  type: MusicAlbum
  date published: 2019-11-17
  track: ブラインド・エゴイスト
    type: MusicRecording
    duration: PT3M50S
    duration ms: 230999
    explicit: false
    by artist: TaKU.K
    in album: 189g
      type: MusicAlbum
      date published: 2019-11-17
    genre: vocaloid
    isrc code: TCJPK2066939
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T10:48:58+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x46d5be3ceb23b3bc044acaf2f8db0e2d9125ef85647c0926746443f13f0b7944
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959001
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959001
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPK2066939
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T11:41:42Z
    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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d5be3ceb23b3bc044acaf2f8db0e2d9125ef85647c0926746443f13f0b7944. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCJPK2066939.
      date published: 2026-07-21T11:41:42Z
    audio: ブラインド・エゴイスト
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 160.005
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.44
      additional property: Energy
        type: PropertyValue
        value: 0.912
      additional property: Speechiness
        type: PropertyValue
        value: 0.075
      additional property: Acousticness
        type: PropertyValue
        value: 0.014
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.129
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.792
      additional property: Loudness (dB)
        type: PropertyValue
        value: -2.822
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Minor
  track: 妄執のゲルニカ
    type: MusicRecording
    duration: PT3M38S
    duration ms: 218999
    explicit: false
    by artist: TaKU.K
    in album: 189g
      type: MusicAlbum
      date published: 2019-11-17
    genre: vocaloid
    isrc code: TCJPK2066943
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-22T11:57:10+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x7c797312bd5cfa1a68aac33aed635b7ec804441be82291bc9c4a92e955a891aa
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959128
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959128
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPK2066943
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T12:33:25Z
    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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c797312bd5cfa1a68aac33aed635b7ec804441be82291bc9c4a92e955a891aa. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCJPK2066943.
      date published: 2026-07-22T12:33:25Z
    audio: 妄執のゲルニカ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 204.926
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.302
      additional property: Energy
        type: PropertyValue
        value: 0.953
      additional property: Speechiness
        type: PropertyValue
        value: 0.143
      additional property: Acousticness
        type: PropertyValue
        value: 0.002
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.333
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.644
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
  track: アンベシル滑落奇譚
track: 溶けない109号室 (feat. 初音ミク)

Loudness (dB)
type: PropertyValue
value: -3.496

Key Name
type: PropertyValue
value: A

Mode Name
type: PropertyValue
value: Major

アンベシル滑落奇譚
type: MusicRecording
duration: PT4M31S
duration ms: 271398
explicit: false
by artist: TaKU.K
in album: 189g
  type: MusicAlbum
  date published: 2019-11-17
genre: vocaloid
isrc code: TCJPK2066953
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-18T20:34:46+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1a0051fb12c42b4bcb05c886084fb10b1a1e866e8c50f9acbf2573293c85b61c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 958607
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/958607
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPK2066953
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-18T21:01:11Z
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0051fb12c42b4bcb05c886084fb10b1a1e866e8c50f9acbf2573293c85b61c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCJPK2066953.
  date published: 2026-07-18T21:01:11Z
audio: アンベシル滑落奇譚
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 193.049
  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: 0.411
  additional property: Energy
    type: PropertyValue
    value: 0.832
  additional property: Speechiness
    type: PropertyValue
    value: 0.054
  additional property: Acousticness
    type: PropertyValue
    value: 0.024
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.048
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.945
  additional property: Loudness (dB)
    type: PropertyValue
    value: -2.215
  additional property: Key Name
    type: PropertyValue
    value: C#
  additional property: Mode Name
    type: PropertyValue
    value: Minor

189g
type: MusicAlbum
date published: 2019-11-17
track: Hedonist's Happy Dinner Table
  type: MusicRecording
  duration: PT3M49S
  duration ms: 229714
  explicit: false
  by artist: TaKU.K
  in album: 189g
    type: MusicAlbum
    date published: 2019-11-17
  genre: vocaloid
  isrc code: TCJPK2066946
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-19T10:23:33+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x3435b8ccb79a08a49ef9beea9df79dab1de2b0e4b90c912d2a97106ea46fa202
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958720
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958720
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPK2066946
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-19T10:53:46Z
  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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3435b8ccb79a08a49ef9beea9df79dab1de2b0e4b90c912d2a97106ea46fa202. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/TCJPK2066946.
    date published: 2026-07-19T10:53:46Z
  audio: Hedonist's Happy Dinner Table
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 105.009
    additional property: Musical Key
      type: PropertyValue
      value: 4
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.65
    additional property: Energy
      type: PropertyValue
      value: 0.797
    additional property: Speechiness
      type: PropertyValue
      value: 0.042
    additional property: Acousticness
      type: PropertyValue
      value: 0.029
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.287
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.919
    additional property: Loudness (dB)
      type: PropertyValue
      value: -4.213
    additional property: Key Name
      type: PropertyValue
      value: E
    additional property: Mode Name
      type: PropertyValue
      value: Minor

溶けない109号室 (feat. 初音ミク)
type: MusicRecording
duration: PT4M41S
duration ms: 281052
explicit: false
by artist: TaKU.K
by artist: Hatsune Miku
in album: Planet Traveler
  type: MusicAlbum
  date published: 2020
isrc code: JP92Q2301025
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-25T20:35:56+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x222ec95ac2f6a6315481c582483494e37360c9f0246a35910ecab6123a1955b2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92Q2301025
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ec95ac2f6a6315481c582483494e37360c9f0246a35910ecab6123a1955b2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JP92Q2301025.
  date published: 2026-07-02T03:55:08Z
audio: 溶けない109号室 (feat. 初音ミク)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 127.532
  additional property: Musical Key
    type: PropertyValue
    value: 6
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.605
  additional property: Energy
    type: PropertyValue
    value: 0.819
  additional property: Speechiness
    type: PropertyValue
    value: 0.033
  additional property: Acousticness
    type: PropertyValue
    value: 0.118
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.232
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.76
  additional property: Loudness (dB)
    type: PropertyValue
    value: -7.646
  additional property: Key Name
    type: PropertyValue
    value: F#
  additional property: Mode Name
    type: PropertyValue
    value: Minor