Xelfer
type: MusicGroup
popularity: 7
followers: 2109
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf3ed6bc5a0f9b2b139220741c47cc7fcef46ab6ab06bd802070fea8e80db2799
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/83064428-7935-4e75-8570-386ca89bde4b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/83064428-7935-4e75-8570-386ca89bde4b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/83064428-7935-4e75-8570-386ca89bde4b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
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 0xf3ed6bc5a0f9b2b139220741c47cc7fcef46ab6ab06bd802070fea8e80db2799. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83064428-7935-4e75-8570-386ca89bde4b.json and https://artists.proofprofile.net/proofs/artist/83064428-7935-4e75-8570-386ca89bde4b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
album: Maschere
  type: MusicAlbum
  date published: 2018-01-03
album: Gocce
  type: MusicAlbum
  date published: 2018-03-02
album: Lupo
  type: MusicAlbum
  date published: 2018-05-08
album: Sogno
  type: MusicAlbum
  date published: 2018-09-26
album: Cicatrici
  type: MusicAlbum
  date published: 2019-01-07
album: Sabbia
  type: MusicAlbum
  date published: 2019-04-29
album: Nascondino
  type: MusicAlbum
  date published: 2019-09-23
album: OMG
  type: MusicAlbum
  date published: 2019-11-04
album: Fragile
  type: MusicAlbum
  date published: 2020-01-13
album: Una fine diversa
  type: MusicAlbum
  date published: 2020-02-24
  track: Una fine diversa
    type: MusicRecording
    duration: PT3M6S
    duration ms: 186666
    explicit: false
    by artist: Xelfer
    in album: Una fine diversa
      type: MusicAlbum
      date published: 2020-02-24
    isrc code: ITB552015874
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T20:19:06+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x674a57e878ca419a3491ca05aaaac6024b5cd053cb969f79da91a9eb600fb16e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958455
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958455
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITB552015874
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T21:28:36Z
    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 0x674a57e878ca419a3491ca05aaaac6024b5cd053cb969f79da91a9eb600fb16e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ITB552015874.
      date published: 2026-07-17T21:28:36Z
    audio: Una fine diversa
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 107.954
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.514
      additional property: Energy
        type: PropertyValue
        value: 0.698
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.039
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.256
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.194
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.372
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Il tetto del mondo
  type: MusicAlbum
  date published: 2020-03-27
album: Uragani
  type: MusicAlbum
  date published: 2020-05-25
album: Boreale
  type: MusicAlbum
  date published: 2021-02-19
album: Magnitudo
  type: MusicAlbum
  date published: 2022-01-28
album: Solo per te
  type: MusicAlbum
  date published: 2024-11-29