Leo/need
type: MusicGroup
genre: j-pop
genre: vocaloid
popularity: 53
followers: 225270
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x222ceab9282405e83244bb37212263e8ed0e82f4297d5bee6b478da91a8a3bc5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/32b1e8c3-b95f-44a0-856d-f9df1288ed6c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/32b1e8c3-b95f-44a0-856d-f9df1288ed6c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/32b1e8c3-b95f-44a0-856d-f9df1288ed6c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
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 0x222ceab9282405e83244bb37212263e8ed0e82f4297d5bee6b478da91a8a3bc5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32b1e8c3-b95f-44a0-856d-f9df1288ed6c.json and https://artists.proofprofile.net/proofs/artist/32b1e8c3-b95f-44a0-856d-f9df1288ed6c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
album: needLe/ステラ
  type: MusicAlbum
  date published: 2021-06-09
album: フレー
  type: MusicAlbum
  date published: 2022
  track: フレー
    type: MusicRecording
    duration: PT3M22S
    duration ms: 202566
    explicit: false
    by artist: Leo/need
    in album: フレー
      type: MusicAlbum
      date published: 2022
    genre: j-pop
    genre: vocaloid
    isrc code: JPX302578040
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-03T16:12:24+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x181142730801200291db8fea163cf7cac49b80868d7a8018a0825301dfc75ad6
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956545
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956545
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPX302578040
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-03T19:59:51Z
    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 0x181142730801200291db8fea163cf7cac49b80868d7a8018a0825301dfc75ad6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPX302578040.
      date published: 2026-07-03T19:59:51Z
    audio: フレー
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 168.045
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.546
      additional property: Energy
        type: PropertyValue
        value: 0.926
      additional property: Speechiness
        type: PropertyValue
        value: 0.13
      additional property: Acousticness
        type: PropertyValue
        value: 0.345
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.099
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.671
      additional property: Loudness (dB)
        type: PropertyValue
        value: -3.308
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: 霽れを待つ/「1」
  type: MusicAlbum
  date published: 2022-02-16
album: Leo/need SEKAI ALBUM vol.1
  type: MusicAlbum
  date published: 2022-05-11
album: フロムトーキョー/流星のパルス
  type: MusicAlbum
  date published: 2022-11-16
album: オーダーメイド/てらてら
  type: MusicAlbum
  date published: 2023-07-05
album: STAGE OF SEKAI/Peaky Peaky
  type: MusicAlbum
  date published: 2023-07-05
album: Voices/the WALL
  type: MusicAlbum
  date published: 2023-08-30
album: Flyway/相生
  type: MusicAlbum
  date published: 2023-11-22
album: Leo/need SEKAI ALBUM vol.2
  type: MusicAlbum
  date published: 2024-03-06
album: 星を繋ぐ/purpose
  type: MusicAlbum
  date published: 2024-06-12
album: Leo/need SEKAI ALBUM vol.2(Selected Edition)
  type: MusicAlbum
  date published: 2024-07-09
album: インテグラル/レグルス
  type: MusicAlbum
  date published: 2024-09-18
album: SToRY
  type: MusicAlbum
  date published: 2025-02-07
album: すれすれ/それでも僕らは歌うことをやめない
  type: MusicAlbum
  date published: 2025-02-19
album: 快晴「劇場版プロジェクトセカイ」ver.
  type: MusicAlbum
  date published: 2025-02-27
album: プロジェクトセカイ カラフルステージ！ feat. 初音ミク アナザーボーカルアルバム Leo/need
  type: MusicAlbum
  date published: 2025-03-31
  track: needLe
    type: MusicRecording
    duration: PT3M47S
    duration ms: 227633
    explicit: false
    by artist: Leo/need
    in album: プロジェクトセカイ カラフルステージ！ feat. 初音ミク アナザーボーカルアルバム Leo/need
      type: MusicAlbum
      date published: 2025-03-31
    genre: j-pop
    genre: vocaloid
    isrc code: JPX302466760
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T07:44:54+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xc4400e252f7004fa6fd598d9289019b45511d5948ec8a9763d65c5e9f96c3e11
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958271
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958271
    additional property: OTSVerificationAPI
    additional property: OTSTimestamp
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: needLe
album: Leo/need SEKAI ALBUM vol.3
album: その音が鳴るなら/Sympathy

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPX302466760

OTSTimestamp
type: PropertyValue
value: 2026-07-16T09:16:54Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4400e252f7004fa6fd598d9289019b45511d5948ec8a9763d65c5e9f96c3e11. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/JPX302466760.
date published: 2026-07-16T09:16:54Z

needLe
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 94.984
additional property: Musical Key
  type: PropertyValue
  value: 4
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.603
additional property: Energy
  type: PropertyValue
  value: 0.968
additional property: Speechiness
  type: PropertyValue
  value: 0.095
additional property: Acousticness
  type: PropertyValue
  value: 0.073
additional property: Instrumentalness
  type: PropertyValue
  value: 0
additional property: Liveness
  type: PropertyValue
  value: 0.376
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.631
additional property: Loudness (dB)
  type: PropertyValue
  value: -2.784
additional property: Key Name
  type: PropertyValue
  value: E
additional property: Mode Name
  type: PropertyValue
  value: Major

Leo/need SEKAI ALBUM vol.3
type: MusicAlbum
date published: 2025-06-25

その音が鳴るなら/Sympathy
type: MusicAlbum
date published: 2025-09-03