Yuma Nakamura
type: MusicGroup
genre: city pop
genre: kayokyoku
popularity: 19
followers: 2896
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x78d044f83d9d77e0a69aa514a2c5c8e00f56ada1b6bf3b8684d76352ff28884d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953827
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953827
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/db9c1aa3-bbf3-4575-99cf-eea971513b2d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/db9c1aa3-bbf3-4575-99cf-eea971513b2d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/db9c1aa3-bbf3-4575-99cf-eea971513b2d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T19:59:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x78d044f83d9d77e0a69aa514a2c5c8e00f56ada1b6bf3b8684d76352ff28884d","name":"Yuma Nakamura","registered_at":"2026-06-15T03:36:13Z","symbol":"NIM0669638","token_address":"0xed228b0bc1172b8ad138e22e3d76ee33b80660dc","type":"artist","uuid":"db9c1aa3-bbf3-4575-99cf-eea971513b2d"}
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 0x78d044f83d9d77e0a69aa514a2c5c8e00f56ada1b6bf3b8684d76352ff28884d. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db9c1aa3-bbf3-4575-99cf-eea971513b2d.json and https://artists.proofprofile.net/proofs/artist/db9c1aa3-bbf3-4575-99cf-eea971513b2d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T19:59:56Z
  text: {"copyright_id":"0x78d044f83d9d77e0a69aa514a2c5c8e00f56ada1b6bf3b8684d76352ff28884d","name":"Yuma Nakamura","registered_at":"2026-06-15T03:36:13Z","symbol":"NIM0669638","token_address":"0xed228b0bc1172b8ad138e22e3d76ee33b80660dc","type":"artist","uuid":"db9c1aa3-bbf3-4575-99cf-eea971513b2d"}
album: Emblem
  type: MusicAlbum
  date published: 1987-03-21
  track: ジレンマ
    type: MusicRecording
    duration: PT3M21S
    duration ms: 201733
    explicit: false
    by artist: Yuma Nakamura
    in album: Emblem
      type: MusicAlbum
      date published: 1987-03-21
    genre: city pop
    genre: kayokyoku
    isrc code: JPFL08700370
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-13T14:18:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x58fb07abde1fd61d7e873b77d604b68ab6d17e886a5f71c477b5e96e38c2e92d
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 957863
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/957863
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPFL08700370
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-13T14:41:15Z
    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 0x58fb07abde1fd61d7e873b77d604b68ab6d17e886a5f71c477b5e96e38c2e92d. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/JPFL08700370.
      date published: 2026-07-13T14:41:15Z
    audio: ジレンマ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 150.15
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.526
      additional property: Energy
        type: PropertyValue
        value: 0.71
      additional property: Speechiness
        type: PropertyValue
        value: 0.036
      additional property: Acousticness
        type: PropertyValue
        value: 0.184
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.001
      additional property: Liveness
        type: PropertyValue
        value: 0.112
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.846
      additional property: Loudness (dB)
        type: PropertyValue
        value: -12.815
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Dang Dang Kininaru
  type: MusicAlbum
  date published: 1989-06-07
album: Dang Dang 気になる
  type: MusicAlbum
  date published: 1989-06-07
  track: Dang Dang 気になる
    type: MusicRecording
    duration: PT3M47S
    duration ms: 227226
    explicit: false
    by artist: Yuma Nakamura
    in album: Dang Dang 気になる
      type: MusicAlbum
      date published: 1989-06-07
    genre: city pop
    genre: kayokyoku
    isrc code: JPVP08900901
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T16:28:57+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf6d92fc0b5bd3ab0812e6b8d10f335b42f6f18aaa562d093525c0a6c729cbe3b
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958176
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958176
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVP08900901
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T19:31:13Z
    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 0xf6d92fc0b5bd3ab0812e6b8d10f335b42f6f18aaa562d093525c0a6c729cbe3b. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:31:13Z), 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/JPVP08900901.
      date published: 2026-07-15T19:31:13Z
    audio: Dang Dang 気になる
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 123.892
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.723
      additional property: Energy
        type: PropertyValue
        value: 0.876
      additional property: Speechiness
        type: PropertyValue
        value: 0.038
      additional property: Acousticness
        type: PropertyValue
        value: 0.498
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
  track: LINE
album: GROWIN'
album: HEAVEN
album: 10 CARATS
album: 10カラット
album: Sayonara no Boukenshatachi
album: さよならの冒険者たち
album: Hold Out!
album: Golden☆Best-VAP YEARS-
album: ゴールデン☆ベスト ～バップ・イヤーズ～
album: ゴールデン☆ベスト～Graduation プラス フォーライフイヤーズ～
album: kai

Instrumentalness
type: PropertyValue
value: 0.001

Liveness
type: PropertyValue
value: 0.243

Valence (Positivity)
type: PropertyValue
value: 0.917

Loudness (dB)
type: PropertyValue
value: -9.559

Key Name
type: PropertyValue
value: Bb

Mode Name
type: PropertyValue
value: Minor

LINE
type: MusicRecording
duration: PT4M42S
duration ms: 282400
explicit: false
by artist: Yuma Nakamura
in album: Dang Dang 気になる
  type: MusicAlbum
  date published: 1989-06-07
genre: city pop
genre: kayokyoku
isrc code: JPVP08900902
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-12T21:47:52+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbd5f6fe84a0241179434901ddad19810e91093342643af8cec5dcd3de545db24
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957766
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957766
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVP08900902
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-12T22:25:04Z
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 0xbd5f6fe84a0241179434901ddad19810e91093342643af8cec5dcd3de545db24. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/JPVP08900902.
  date published: 2026-07-12T22:25:04Z
audio: LINE
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 109.976
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.622
  additional property: Energy
    type: PropertyValue
    value: 0.762
  additional property: Speechiness
    type: PropertyValue
    value: 0.033
  additional property: Acousticness
    type: PropertyValue
    value: 0.35
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.011
  additional property: Liveness
    type: PropertyValue
    value: 0.34
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.959
  additional property: Loudness (dB)
    type: PropertyValue
    value: -10.721
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Minor

GROWIN'
type: MusicAlbum
date published: 1989-07-21

GROWIN'
type: MusicAlbum
date published: 1989-07-21

HEAVEN
type: MusicAlbum
date published: 1989-11-29

HEAVEN
type: MusicAlbum
date published: 1989-11-29

10 CARATS
type: MusicAlbum
date published: 1990-02-05

10カラット
type: MusicAlbum
date published: 1990-02-05

Sayonara no Boukenshatachi
type: MusicAlbum
date published: 1990-09-21

さよならの冒険者たち
type: MusicAlbum
date published: 1990-09-21

Hold Out!
type: MusicAlbum
date published: 1990-11-05

Hold Out!
type: MusicAlbum
date published: 1990-11-05

Golden☆Best-VAP YEARS-
type: MusicAlbum
date published: 2011-05-18

ゴールデン☆ベスト ～バップ・イヤーズ～
type: MusicAlbum
date published: 2011-05-18

ゴールデン☆ベスト～Graduation プラス フォーライフイヤーズ～
type: MusicAlbum
date published: 2011-05-25

kai
type: MusicAlbum
date published: 2024-08-01