iu takahashi
type: MusicGroup
genre: ambient
genre: drone
popularity: 16
followers: 1885
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x25ac44dba2b53fb251db41645ad0bfef9fed7cc59c24ba2feea47efaa00c287e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953727
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953727
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8edafe49-047c-4356-b6ef-fd72139e568a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8edafe49-047c-4356-b6ef-fd72139e568a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8edafe49-047c-4356-b6ef-fd72139e568a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T02:33:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x25ac44dba2b53fb251db41645ad0bfef9fed7cc59c24ba2feea47efaa00c287e","name":"iu takahashi","registered_at":"2026-06-14T19:30:19Z","symbol":"NIM0553645","token_address":"0xbae77cadf0b7c40c146c8d6cc91dad8c6d7b7c75","type":"artist","uuid":"8edafe49-047c-4356-b6ef-fd72139e568a"}
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 0x25ac44dba2b53fb251db41645ad0bfef9fed7cc59c24ba2feea47efaa00c287e. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8edafe49-047c-4356-b6ef-fd72139e568a.json and https://artists.proofprofile.net/proofs/artist/8edafe49-047c-4356-b6ef-fd72139e568a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T02:33:01Z
  text: {"copyright_id":"0x25ac44dba2b53fb251db41645ad0bfef9fed7cc59c24ba2feea47efaa00c287e","name":"iu takahashi","registered_at":"2026-06-14T19:30:19Z","symbol":"NIM0553645","token_address":"0xbae77cadf0b7c40c146c8d6cc91dad8c6d7b7c75","type":"artist","uuid":"8edafe49-047c-4356-b6ef-fd72139e568a"}
album: fluid
  type: MusicAlbum
  date published: 2018-03-18
album: halfway
  type: MusicAlbum
  date published: 2018-07-30
album: halfway
  type: MusicAlbum
  date published: 2018-07-30
album: Halfway
  type: MusicAlbum
  date published: 2018-07-30
album: Contour
  type: MusicAlbum
  date published: 2020-05-31
album: Contour
  type: MusicAlbum
  date published: 2020-05-31
album: Depthscape
  type: MusicAlbum
  date published: 2020-11-02
album: Late in life
  type: MusicAlbum
  date published: 2021-04-16
album: Late in life
  type: MusicAlbum
  date published: 2021-04-16
  track: Forest and Thought
    type: MusicRecording
    duration: PT5M1S
    duration ms: 301000
    explicit: false
    by artist: iu takahashi
    in album: Late in life
      type: MusicAlbum
      date published: 2021-04-16
    genre: ambient
    genre: drone
    isrc code: TCJPP2147056
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T11:43:01+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x69b9952fbdbfca3e86b811a59ba0701a07b7decd0f40cfd2c2b8fd4b307a280a
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958544
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958544
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPP2147056
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T12:14:37Z
    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 0x69b9952fbdbfca3e86b811a59ba0701a07b7decd0f40cfd2c2b8fd4b307a280a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCJPP2147056.
      date published: 2026-07-18T12:14:37Z
    audio: Forest and Thought
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 71.776
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.069
      additional property: Energy
        type: PropertyValue
        value: 0.104
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.903
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.975
      additional property: Liveness
        type: PropertyValue
        value: 0.078
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.055
      additional property: Loudness (dB)
        type: PropertyValue
        value: -28.164
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Gallery window
  type: MusicAlbum
  date published: 2021-10-29
album: bath
  type: MusicAlbum
  date published: 2021-11-25
album: Interspace
  type: MusicAlbum
  date published: 2021-12-10
album: still left
  type: MusicAlbum
  date published: 2022-06-21
album: Still Left
  type: MusicAlbum
  date published: 2022-06-21
  track: Underground Birds
    type: MusicRecording
    duration: PT5M28S
    duration ms: 328000
    explicit: false
    by artist: iu takahashi
    in album: Still Left
      type: MusicAlbum
      date published: 2022-06-21
    genre: ambient
    genre: drone
    isrc code: QM4TW2316776
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T11:06:11+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xcf6cd7981e7c306ccb8c870c4c0201b37fb86300ea5ba7b0da2069623cbab85c
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958544
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958544
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2316776
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T12:14:37Z
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: Underground Birds
album: Sense/Margin

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6cd7981e7c306ccb8c870c4c0201b37fb86300ea5ba7b0da2069623cbab85c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QM4TW2316776.
date published: 2026-07-18T12:14:37Z

Underground Birds
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 131.563
additional property: Musical Key
  type: PropertyValue
  value: 2
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.161
additional property: Energy
  type: PropertyValue
  value: 0.169
additional property: Speechiness
  type: PropertyValue
  value: 0.042
additional property: Acousticness
  type: PropertyValue
  value: 0.905
additional property: Instrumentalness
  type: PropertyValue
  value: 0.756
additional property: Liveness
  type: PropertyValue
  value: 0.099
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.358
additional property: Loudness (dB)
  type: PropertyValue
  value: -28.911
additional property: Key Name
  type: PropertyValue
  value: D
additional property: Mode Name
  type: PropertyValue
  value: Major

still left
type: MusicAlbum
date published: 2022-06-21

Sense/Margin
type: MusicAlbum
date published: 2023-12-15