マツヤマイカ
type: MusicGroup
popularity: 9
followers: 1314
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdad62820cc7bc1d0d211856f57ba2fb46a0753f178dc043b58505c64d6d84799
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/56c27ebb-f97b-4a36-971b-0748f0031015.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/56c27ebb-f97b-4a36-971b-0748f0031015.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/56c27ebb-f97b-4a36-971b-0748f0031015
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdad62820cc7bc1d0d211856f57ba2fb46a0753f178dc043b58505c64d6d84799","name":"マツヤマイカ","registered_at":"2026-06-16T19:54:05Z","symbol":"NIM1158391","token_address":"0x78c0fbca6e0ab58829f45afabb4134bea3772b46","type":"artist","uuid":"56c27ebb-f97b-4a36-971b-0748f0031015"}
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 0xdad62820cc7bc1d0d211856f57ba2fb46a0753f178dc043b58505c64d6d84799. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56c27ebb-f97b-4a36-971b-0748f0031015.json and https://artists.proofprofile.net/proofs/artist/56c27ebb-f97b-4a36-971b-0748f0031015.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xdad62820cc7bc1d0d211856f57ba2fb46a0753f178dc043b58505c64d6d84799","name":"マツヤマイカ","registered_at":"2026-06-16T19:54:05Z","symbol":"NIM1158391","token_address":"0x78c0fbca6e0ab58829f45afabb4134bea3772b46","type":"artist","uuid":"56c27ebb-f97b-4a36-971b-0748f0031015"}
album: センチメンタル・ムーン
  type: MusicAlbum
  date published: 2023-06-06
album: NEKONOKO
  type: MusicAlbum
  date published: 2024-06-05
album: 猫の子
  type: MusicAlbum
  date published: 2024-06-05
  track: 猫の子
    type: MusicRecording
    duration: PT3M55S
    duration ms: 235200
    explicit: false
    by artist: マツヤマイカ
    in album: 猫の子
      type: MusicAlbum
      date published: 2024-06-05
    isrc code: JPVI02401593
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T06:53:54+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xec98cde1425275aa7b9f24c8758479cbe0d1d1f06f53ec3c15af20de89ad5f03
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958380
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958380
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02401593
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T07:07:02Z
    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 0xec98cde1425275aa7b9f24c8758479cbe0d1d1f06f53ec3c15af20de89ad5f03. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/JPVI02401593.
      date published: 2026-07-17T07:07:02Z
    audio: 猫の子
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 149.954
      additional property: Musical Key
        type: PropertyValue
        value: 3
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.688
      additional property: Energy
        type: PropertyValue
        value: 0.88
      additional property: Speechiness
        type: PropertyValue
        value: 0.058
      additional property: Acousticness
        type: PropertyValue
        value: 0.101
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.03
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.543
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.725
      additional property: Key Name
        type: PropertyValue
        value: Eb
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Tokyo Romantic
  type: MusicAlbum
  date published: 2025-02-19
album: 東京ロマンチック
  type: MusicAlbum
  date published: 2025-02-19
  track: センチメンタル・ムーン
    type: MusicRecording
    duration: PT3M23S
    duration ms: 203133
    explicit: false
    by artist: マツヤマイカ
    in album: 東京ロマンチック
      type: MusicAlbum
      date published: 2025-02-19
    isrc code: TCJPW2314903
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T16:50:44+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x9346124b1aa6d0f59b383f81b1493d8656ac944cb366c1f6ea362812b14140fc
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958765
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958765
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPW2314903
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T18:01:47Z
    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 0x9346124b1aa6d0f59b383f81b1493d8656ac944cb366c1f6ea362812b14140fc. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/TCJPW2314903.
      date published: 2026-07-19T18:01:47Z
    audio: センチメンタル・ムーン
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 127.996
      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: 0.616
      additional property: Energy
        type: PropertyValue
        value: 0.951
      additional property: Speechiness
        type: PropertyValue
        value: 0.035
      additional property: Acousticness
        type: PropertyValue
        value: 0.027
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: Kohaku-iro no Loneliness
album: 琥珀色のロンリネス

Instrumentalness
type: PropertyValue
value: 0.001

Liveness
type: PropertyValue
value: 0.119

Valence (Positivity)
type: PropertyValue
value: 0.898

Loudness (dB)
type: PropertyValue
value: -3.299

Key Name
type: PropertyValue
value: A

Mode Name
type: PropertyValue
value: Major

Kohaku-iro no Loneliness
type: MusicAlbum
date published: 2025-11-12

琥珀色のロンリネス
type: MusicAlbum
date published: 2025-11-12