Once Sempai
type: MusicGroup
genre: guaracha
genre: latin house
genre: tech house
popularity: 11
followers: 280
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfff397c6568eaa1edb918b35b538ae80a9cd54bb10dea9b3cc7c914ce6b2ed81
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953625
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953625
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/280316dc-e887-4532-ba7e-7b81577ab7d8.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/280316dc-e887-4532-ba7e-7b81577ab7d8.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/280316dc-e887-4532-ba7e-7b81577ab7d8
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T11:37:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfff397c6568eaa1edb918b35b538ae80a9cd54bb10dea9b3cc7c914ce6b2ed81","name":"Once Sempai","registered_at":"2026-06-14T08:35:19Z","symbol":"NIM0397402","token_address":"0x466cf749884eb8ff7f2e5ec69b0bd73ffbcb468d","type":"artist","uuid":"280316dc-e887-4532-ba7e-7b81577ab7d8"}
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 0xfff397c6568eaa1edb918b35b538ae80a9cd54bb10dea9b3cc7c914ce6b2ed81. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/280316dc-e887-4532-ba7e-7b81577ab7d8.json and https://artists.proofprofile.net/proofs/artist/280316dc-e887-4532-ba7e-7b81577ab7d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T11:37:06Z
  text: {"copyright_id":"0xfff397c6568eaa1edb918b35b538ae80a9cd54bb10dea9b3cc7c914ce6b2ed81","name":"Once Sempai","registered_at":"2026-06-14T08:35:19Z","symbol":"NIM0397402","token_address":"0x466cf749884eb8ff7f2e5ec69b0bd73ffbcb468d","type":"artist","uuid":"280316dc-e887-4532-ba7e-7b81577ab7d8"}
album: WATA
  type: MusicAlbum
  date published: 2023-07-20
album: Bailoteo, Vol. 1
  type: MusicAlbum
  date published: 2024-04-11
album: Let's Groove
  type: MusicAlbum
  date published: 2024-06-07
album: Infinity
  type: MusicAlbum
  date published: 2024-07-12
album: Al Son Que Me Toquen Bailo (feat. La-33) [Once Sempai Remix]
  type: MusicAlbum
  date published: 2024-09-12
  track: Al Son Que Me Toquen Bailo (feat. La-33) - Once Sempai Remix
    type: MusicRecording
    duration: PT6M1S
    duration ms: 361848
    explicit: false
    by artist: Once Sempai
    in album: Al Son Que Me Toquen Bailo (feat. La-33) [Once Sempai Remix]
      type: MusicAlbum
      date published: 2024-09-12
    genre: guaracha
    genre: latin house
    genre: tech house
    isrc code: BK4DA2438559
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-30T05:38:53+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xb76ba2006b1120dde2f28c917b9b9f60418b0f0483730d79161bd8cca540f482
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960216
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960216
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BK4DA2438559
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-30T06:39:12Z
    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 0xb76ba2006b1120dde2f28c917b9b9f60418b0f0483730d79161bd8cca540f482. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BK4DA2438559.
      date published: 2026-07-30T06:39:12Z
    audio: Al Son Que Me Toquen Bailo (feat. La-33) - Once Sempai Remix
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 138.397
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.563
      additional property: Energy
        type: PropertyValue
        value: 0.918
      additional property: Speechiness
        type: PropertyValue
        value: 0.187
      additional property: Acousticness
        type: PropertyValue
        value: 0.046
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.306
      additional property: Liveness
        type: PropertyValue
        value: 0.049
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.684
      additional property: Loudness (dB)
        type: PropertyValue
        value: -8.926
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: yo solito ;)
  type: MusicAlbum
  date published: 2025-05-04