Letsko
type: MusicGroup
popularity: 19
followers: 234
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0156e7f3e11d933ceb323a1be1aa455044a066dcb59ae78610937b67f36ae5ce
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953687
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953687
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/688f2c76-f8c2-477a-8efe-34a279693d10.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/688f2c76-f8c2-477a-8efe-34a279693d10.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/688f2c76-f8c2-477a-8efe-34a279693d10
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T20:19:15Z
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 0x0156e7f3e11d933ceb323a1be1aa455044a066dcb59ae78610937b67f36ae5ce. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/688f2c76-f8c2-477a-8efe-34a279693d10.json and https://artists.proofprofile.net/proofs/artist/688f2c76-f8c2-477a-8efe-34a279693d10.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T20:19:15Z
album: PIANO: Grey Piano Anatomy
  type: MusicAlbum
  date published: 2021-10-08
album: PIANO: Grey Piano Anatomy
  type: MusicAlbum
  date published: 2021-10-08
album: STUDY: Buttercream Bookworm
  type: MusicAlbum
  date published: 2022-01-14
album: STUDY: Buttercream Bookworm
  type: MusicAlbum
  date published: 2022-01-14
album: Red Eye
  type: MusicAlbum
  date published: 2022-02-18
album: Gone Gone
  type: MusicAlbum
  date published: 2022-02-18
album: Willow
  type: MusicAlbum
  date published: 2022-02-18
album: Kamogawa
  type: MusicAlbum
  date published: 2022-03-25
album: Aki
  type: MusicAlbum
  date published: 2022-03-25
album: Dose
  type: MusicAlbum
  date published: 2022-09-23
album: 1BR
  type: MusicAlbum
  date published: 2022-10-28
album: Moon Prints
  type: MusicAlbum
  date published: 2022-11-25
album: Out of Nowhere
  type: MusicAlbum
  date published: 2022-12-23
album: Spring
  type: MusicAlbum
  date published: 2023-02-24
album: Sleep No More
  type: MusicAlbum
  date published: 2023-03-31
album: Crescent
  type: MusicAlbum
  date published: 2024-02-16
album: Run For Your Life
  type: MusicAlbum
  date published: 2025-02-14
  track: Run For Your Life
    type: MusicRecording
    duration: PT2M16S
    duration ms: 136857
    explicit: false
    by artist: Letsko
    in album: Run For Your Life
      type: MusicAlbum
      date published: 2025-02-14
    isrc code: CAB392404427
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T04:40:42+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x7b6c655633db3251d03f0b748679a28c43098915ea015923f5a440ae782d2379
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956772
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956772
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAB392404427
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:01:46Z
    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 0x7b6c655633db3251d03f0b748679a28c43098915ea015923f5a440ae782d2379. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAB392404427.
      date published: 2026-07-05T10:01:46Z
    audio: Run For Your Life
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 118.616
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.338
      additional property: Energy
        type: PropertyValue
        value: 0.269
      additional property: Speechiness
        type: PropertyValue
        value: 0.06
      additional property: Acousticness
        type: PropertyValue
        value: 0.976
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.927
      additional property: Liveness
        type: PropertyValue
        value: 0.108
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.112
      additional property: Loudness (dB)
        type: PropertyValue
        value: -17.096
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Ocean Fall and Rise
  type: MusicAlbum
  date published: 2025-03-07
album: Tomorrow
  type: MusicAlbum
  date published: 2025-03-28
album: Erupt Again
  type: MusicAlbum
  date published: 2025-04-18
album: Inside Out
  type: MusicAlbum
  date published: 2025-05-09
  track: Inside Out
    type: MusicRecording
    duration: PT2M14S
    duration ms: 134101
    explicit: false
    by artist: Letsko
    in album: Inside Out
      type: MusicAlbum
      date published: 2025-05-09
    isrc code: CAB392404423
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T16:37:13+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x9f0758ca90c8299a074c292797f32880d86ab317e03767f3ae924cf0c971aedf
    additional property: OTSHash
    additional property: OTSBitcoinBlock
    additional property: OTSBitcoinBlockVerifyURL
    additional property: OTSVerificationAPI
    additional property: OTSTimestamp
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: Inside Out
album: Five Alive
album: Doll
album: Rush Hour
album: One Step
album: Islands
album: The Light
album: Young Fiction

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 958765

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/958765

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAB392404423

OTSTimestamp
type: PropertyValue
value: 2026-07-19T18:01:47Z

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 0x9f0758ca90c8299a074c292797f32880d86ab317e03767f3ae924cf0c971aedf. 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/CAB392404423.
date published: 2026-07-19T18:01:47Z

Inside Out
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 112.799
additional property: Musical Key
  type: PropertyValue
  value: 2
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 3
additional property: Danceability
  type: PropertyValue
  value: 0.72
additional property: Energy
  type: PropertyValue
  value: 0.278
additional property: Speechiness
  type: PropertyValue
  value: 0.034
additional property: Acousticness
  type: PropertyValue
  value: 0.901
additional property: Instrumentalness
  type: PropertyValue
  value: 0.842
additional property: Liveness
  type: PropertyValue
  value: 0.096
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.105
additional property: Loudness (dB)
  type: PropertyValue
  value: -16.539
additional property: Key Name
  type: PropertyValue
  value: D
additional property: Mode Name
  type: PropertyValue
  value: Minor

Five Alive
type: MusicAlbum
date published: 2025-05-30

Doll
type: MusicAlbum
date published: 2025-06-20

Rush Hour
type: MusicAlbum
date published: 2025-07-11

One Step
type: MusicAlbum
date published: 2025-08-01

Islands
type: MusicAlbum
date published: 2025-08-22

The Light
type: MusicAlbum
date published: 2025-10-24

Young Fiction
type: MusicAlbum
date published: 2025-11-14