Sleep Keeper
type: MusicGroup
genre: shoegaze
popularity: 5
followers: 478
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe32106e2cc3bb41bbcd6c0577151fab8935b0d3bd36edfeb641d9c0bfbc2613d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/de1dfa6c-ca7a-41ea-a141-10bb5cacdc68.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/de1dfa6c-ca7a-41ea-a141-10bb5cacdc68.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/de1dfa6c-ca7a-41ea-a141-10bb5cacdc68
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xe32106e2cc3bb41bbcd6c0577151fab8935b0d3bd36edfeb641d9c0bfbc2613d","name":"Sleep Keeper","registered_at":"2026-06-21T05:40:31Z","symbol":"NIM1837037","token_address":"0xce776ebc236fcb6d9a4c6db98df8525e679f2aa7","type":"artist","uuid":"de1dfa6c-ca7a-41ea-a141-10bb5cacdc68"}
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 0xe32106e2cc3bb41bbcd6c0577151fab8935b0d3bd36edfeb641d9c0bfbc2613d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de1dfa6c-ca7a-41ea-a141-10bb5cacdc68.json and https://artists.proofprofile.net/proofs/artist/de1dfa6c-ca7a-41ea-a141-10bb5cacdc68.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xe32106e2cc3bb41bbcd6c0577151fab8935b0d3bd36edfeb641d9c0bfbc2613d","name":"Sleep Keeper","registered_at":"2026-06-21T05:40:31Z","symbol":"NIM1837037","token_address":"0xce776ebc236fcb6d9a4c6db98df8525e679f2aa7","type":"artist","uuid":"de1dfa6c-ca7a-41ea-a141-10bb5cacdc68"}
album: Moonswimmer
  type: MusicAlbum
  date published: 2022-06-24
  track: Gone Since Tomorrow
    type: MusicRecording
    duration: PT5M34S
    duration ms: 334000
    explicit: false
    by artist: Sleep Keeper
    in album: Moonswimmer
      type: MusicAlbum
      date published: 2022-06-24
    genre: shoegaze
    isrc code: QZHNB2263872
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T13:13:23+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd84cd008e9d0764204b496266efbaf003cdd3d89824c75ed7b522d090abe568b
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958749
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958749
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNB2263872
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T16:15:51Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84cd008e9d0764204b496266efbaf003cdd3d89824c75ed7b522d090abe568b. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:15:51Z), 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/QZHNB2263872.
      date published: 2026-07-19T16:15:51Z
    audio: Gone Since Tomorrow
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 72.022
      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: 0.317
      additional property: Energy
        type: PropertyValue
        value: 0.462
      additional property: Speechiness
        type: PropertyValue
        value: 0.031
      additional property: Acousticness
        type: PropertyValue
        value: 0.002
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.916
      additional property: Liveness
        type: PropertyValue
        value: 0.105
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.107
      additional property: Loudness (dB)
        type: PropertyValue
        value: -8.448
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Cling
  type: MusicAlbum
  date published: 2024-01-19
album: Celes
  type: MusicAlbum
  date published: 2024-12-13
album: Crawl
  type: MusicAlbum
  date published: 2025-10-03