elfin'
type: MusicGroup
popularity: 6
followers: 504
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x107fefd59d5b58f24ff8df2ccb33dd453dbe9b57385a58e913e3bcc99ce05a29
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954728
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954728
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fad7ba93-ef0d-4203-8054-3efe689edfbe.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fad7ba93-ef0d-4203-8054-3efe689edfbe.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fad7ba93-ef0d-4203-8054-3efe689edfbe
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T18:08:38Z
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 0x107fefd59d5b58f24ff8df2ccb33dd453dbe9b57385a58e913e3bcc99ce05a29. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fad7ba93-ef0d-4203-8054-3efe689edfbe.json and https://artists.proofprofile.net/proofs/artist/fad7ba93-ef0d-4203-8054-3efe689edfbe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T18:16:07Z
album: Colorful Fantasy~通常盤~
  type: MusicAlbum
  date published: 2015-08-05
album: 貪欲スナイパー
  type: MusicAlbum
  date published: 2018-01-17
album: Donyoku Sniper
  type: MusicAlbum
  date published: 2018-04-17
album: 君にエール!!!! ～同じ空の下で～
  type: MusicAlbum
  date published: 2018-11-07
album: Kimi ni Ale!!!! ～ Onaji Sora no Shitade ～
  type: MusicAlbum
  date published: 2018-11-07
album: Yureru, Kureru, Hazeru
  type: MusicAlbum
  date published: 2019-05-22
album: ユレル、クレル、ハゼル
  type: MusicAlbum
  date published: 2019-05-22
  track: ふにゃにゃんヒーロー
    type: MusicRecording
    duration: PT3M8S
    duration ms: 188973
    explicit: false
    by artist: elfin'
    in album: ユレル、クレル、ハゼル
      type: MusicAlbum
      date published: 2019-05-22
    isrc code: JPC231900353
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T07:49:10+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x093b654c60d4fe175ea89e496d7f12c9bbafb746ded629f5d416e8fa3cc5bb66
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958846
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958846
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPC231900353
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T10:51:12Z
    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 0x093b654c60d4fe175ea89e496d7f12c9bbafb746ded629f5d416e8fa3cc5bb66. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:51:12Z), 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/JPC231900353.
      date published: 2026-07-20T10:51:12Z
    audio: ふにゃにゃんヒーロー
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 100.026
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.678
      additional property: Energy
        type: PropertyValue
        value: 0.992
      additional property: Speechiness
        type: PropertyValue
        value: 0.18
      additional property: Acousticness
        type: PropertyValue
        value: 0.184
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.068
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.588
      additional property: Loudness (dB)
        type: PropertyValue
        value: -1.562
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Everyone Who Says Don't Leave, Leave
  type: MusicAlbum
  date published: 2019-10-21
album: Shoukei Refrain (Standard Edition B)
  type: MusicAlbum
  date published: 2020-01-15
album: 憧憬リフレイン
  type: MusicAlbum
  date published: 2020-01-15
album: 憧憬リフレイン
  type: MusicAlbum
  date published: 2020-01-15
  track: きまぐれ☆にゃんにゃんヒストリー!
    type: MusicRecording
    duration: PT3M58S
    duration ms: 238013
    explicit: false
    by artist: elfin'
    in album: 憧憬リフレイン
      type: MusicAlbum
      date published: 2020-01-15
    isrc code: JPPC01901986
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T10:15:20+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x49fef7f0b84770c60206ecf6347b5ab5a8baa0bdd57acafcf5bc707b8ed5a8f7
    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/JPPC01901986
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T12:03:24Z
    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 0x49fef7f0b84770c60206ecf6347b5ab5a8baa0bdd57acafcf5bc707b8ed5a8f7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-20T12:03:24Z), 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/JPPC01901986.
      date published: 2026-07-20T12:03:24Z
    audio: きまぐれ☆にゃんにゃんヒストリー!
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 175.006
      additional property: Musical Key
        type: PropertyValue
        value: 6
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
      additional property: Danceability
      additional property: Energy
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: Shoukei Refrain (Standard Edition A)
album: Believer's Disco
album: Restage
album: 東京マーメイド

Time Signature
type: PropertyValue
value: 4

Danceability
type: PropertyValue
value: 0.477

Energy
type: PropertyValue
value: 0.956

Speechiness
type: PropertyValue
value: 0.086

Acousticness
type: PropertyValue
value: 0.019

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.351

Valence (Positivity)
type: PropertyValue
value: 0.804

Loudness (dB)
type: PropertyValue
value: -2.778

Key Name
type: PropertyValue
value: F#

Mode Name
type: PropertyValue
value: Major

Shoukei Refrain (Standard Edition A)
type: MusicAlbum
date published: 2020-01-15

Believer's Disco
type: MusicAlbum
date published: 2021-03-17

Believer's Disco
type: MusicAlbum
date published: 2021-03-17

Restage
type: MusicAlbum
date published: 2024-10-28

東京マーメイド
type: MusicAlbum
date published: 2024-10-28