SEFO
type: MusicGroup
genre: happy hardcore
description: Seyfullah Sağır (born 16 March 1998), better known as Sefo, is a Turkish singer, songwriter and rapper. He rose to fame in Turkey with his song "Bilmem mi?", which features reggaeton elements. Life a
popularity: 5
followers: 100
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953889
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e708501-6feb-437a-a9e9-2a1b727a8074.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e708501-6feb-437a-a9e9-2a1b727a8074.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0e708501-6feb-437a-a9e9-2a1b727a8074
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T04:57:45Z
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 0x7f10a0558156a46abf6cde4b63f998b3c575dd8d7277b7733759b67f1a03f57d. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e708501-6feb-437a-a9e9-2a1b727a8074.json and https://artists.proofprofile.net/proofs/artist/0e708501-6feb-437a-a9e9-2a1b727a8074.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T04:57:45Z
album: HEAVEN
  type: MusicAlbum
  date published: 2021-10-20
album: HEAVEN
  type: MusicAlbum
  date published: 2021-10-20
album: Over Again
  type: MusicAlbum
  date published: 2022-10-15
album: Over Again
  type: MusicAlbum
  date published: 2022-10-15
album: 세포체조
  type: MusicAlbum
  date published: 2024-04-04
album: My Son, I Love You (feat. DONO)
  type: MusicAlbum
  date published: 2024-05-08
album: 세포구조대 (SEFO's rescue team)
  type: MusicAlbum
  date published: 2024-09-26
album: 김치파워 (Kimchi Power)
  type: MusicAlbum
  date published: 2024-12-05
album: Let's Vaunce
  type: MusicAlbum
  date published: 2025-06-19
album: Baby Shark (Kids Remix)
  type: MusicAlbum
  date published: 2025-07-24
album: Baby Shark (Festival Remix)
  type: MusicAlbum
  date published: 2025-09-04
  track: Baby Shark - Festival Remix
    type: MusicRecording
    duration: PT2M16S
    duration ms: 136000
    explicit: false
    by artist: SEFO
    in album: Baby Shark (Festival Remix)
      type: MusicAlbum
      date published: 2025-09-04
    genre: happy hardcore
    isrc code: KSB032501106
    additional property: CopyrightID
    additional property: CopyrightStatus
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      value: registered
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    additional property: OTSBitcoinBlock
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    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956420
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/KSB032501106
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-03T00:42:11Z
    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 0x00f11d40a9bdf79a82cd426703c9ae0ef4389edf6b2e06e17634d0c6c3dfe1d9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/KSB032501106.
      date published: 2026-07-03T00:42:11Z
    audio: Baby Shark - Festival Remix
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 150.089
      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: 0.524
      additional property: Energy
        type: PropertyValue
        value: 0.988
      additional property: Speechiness
        type: PropertyValue
        value: 0.262
      additional property: Acousticness
        type: PropertyValue
        value: 0.002
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.305
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.425
      additional property: Loudness (dB)
        type: PropertyValue
        value: -1.877
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major