SAK.
type: MusicGroup
popularity: 21
followers: 549
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8912b882e7b7deb7065e0b2969f98cb1480b8dee4c5cbff076068bbbbfafac03
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/9dcfb9f3-305b-4abd-a5ce-778044104f0f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9dcfb9f3-305b-4abd-a5ce-778044104f0f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9dcfb9f3-305b-4abd-a5ce-778044104f0f
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 0x8912b882e7b7deb7065e0b2969f98cb1480b8dee4c5cbff076068bbbbfafac03. 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/9dcfb9f3-305b-4abd-a5ce-778044104f0f.json and https://artists.proofprofile.net/proofs/artist/9dcfb9f3-305b-4abd-a5ce-778044104f0f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
album: Chocolate
  type: MusicAlbum
  date published: 2010-04-04
album: Chocolate
  type: MusicAlbum
  date published: 2010-04-04
album: Infectious Love
  type: MusicAlbum
  date published: 2020-04-12
album: Aloha ʻOe
  type: MusicAlbum
  date published: 2020-07-04
album: Aloha 'Oe
  type: MusicAlbum
  date published: 2020-07-04
album: I Surrender All
  type: MusicAlbum
  date published: 2020-10-24
album: I Surrender All
  type: MusicAlbum
  date published: 2020-10-24
album: O Holy Night
  type: MusicAlbum
  date published: 2020-11-28
album: O Holy Night
  type: MusicAlbum
  date published: 2020-11-28
album: Life Is Beautiful
  type: MusicAlbum
  date published: 2021-03-13
album: Life Is Beautiful
  type: MusicAlbum
  date published: 2021-03-13
album: The First Noel
  type: MusicAlbum
  date published: 2021-12-21
album: The First Noel
  type: MusicAlbum
  date published: 2021-12-21
album: Stability
  type: MusicAlbum
  date published: 2023-12-02
album: 最大のFLIGHT
  type: MusicAlbum
  date published: 2025-07-12
album: The Highest Flight
  type: MusicAlbum
  date published: 2025-07-12
album: イマジネーション
  type: MusicAlbum
  date published: 2025-09-20
album: Imagination
  type: MusicAlbum
  date published: 2025-09-20
track: Summer Twilight (feat. SAK.)
  type: MusicRecording
  duration: PT4M25S
  duration ms: 265012
  explicit: false
  by artist: Hiroshi Okubo
  by artist: SAK.
  in album: AD:HOUSE 10
    type: MusicAlbum
    date published: 2022-08-13
  isrc code: TCJPT2271229
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-27T07:49:59+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x8cc8f2e4e6791a8cc63174297a0e6726b5babc8adffdd872112d1075be0fd7bf
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956304
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956304
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPT2271229
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-02T03:55:08Z
  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 0x8cc8f2e4e6791a8cc63174297a0e6726b5babc8adffdd872112d1075be0fd7bf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCJPT2271229.
    date published: 2026-07-02T03:55:08Z
  audio: Summer Twilight (feat. SAK.)
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 137.033
    additional property: Musical Key
      type: PropertyValue
      value: 1
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.689
    additional property: Energy
      type: PropertyValue
      value: 0.813
    additional property: Speechiness
      type: PropertyValue
      value: 0.038
    additional property: Acousticness
      type: PropertyValue
      value: 0.208
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.005
    additional property: Liveness
      type: PropertyValue
      value: 0.11
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.573
    additional property: Loudness (dB)
      type: PropertyValue
      value: -11.176
    additional property: Key Name
      type: PropertyValue
      value: C#
    additional property: Mode Name
      type: PropertyValue
      value: Major