Sergio Fer
type: MusicGroup
popularity: 2
followers: 23
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xaf0811a355727fe872b8951d1d3c44ca59a04c9145d19a935675fcb1b17baf53
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954728
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954728
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fb0f233e-7e3d-4d58-bb50-3ca9ff924915.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fb0f233e-7e3d-4d58-bb50-3ca9ff924915.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fb0f233e-7e3d-4d58-bb50-3ca9ff924915
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T18:08:38Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xaf0811a355727fe872b8951d1d3c44ca59a04c9145d19a935675fcb1b17baf53","name":"Sergio Fer","registered_at":"2026-06-21T16:45:29Z","symbol":"NIM1978244","token_address":"0xd1f349f5c80f65df0497c7364e071d565f48a81e","type":"artist","uuid":"fb0f233e-7e3d-4d58-bb50-3ca9ff924915"}
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 0xaf0811a355727fe872b8951d1d3c44ca59a04c9145d19a935675fcb1b17baf53. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb0f233e-7e3d-4d58-bb50-3ca9ff924915.json and https://artists.proofprofile.net/proofs/artist/fb0f233e-7e3d-4d58-bb50-3ca9ff924915.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T18:16:07Z
  text: {"copyright_id":"0xaf0811a355727fe872b8951d1d3c44ca59a04c9145d19a935675fcb1b17baf53","name":"Sergio Fer","registered_at":"2026-06-21T16:45:29Z","symbol":"NIM1978244","token_address":"0xd1f349f5c80f65df0497c7364e071d565f48a81e","type":"artist","uuid":"fb0f233e-7e3d-4d58-bb50-3ca9ff924915"}
album: A la deriva
  type: MusicAlbum
  date published: 2025-10-06
  track: A la deriva
    type: MusicRecording
    duration: PT4M37S
    duration ms: 277000
    explicit: false
    by artist: Sergio Fer
    in album: A la deriva
      type: MusicAlbum
      date published: 2025-10-06
    isrc code: USX9P2538154
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T21:35:58+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x92c62ebad105e03ada4ea939fe74f468720f47a5d4dbbb976c9d6c2cfb128c29
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958935
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958935
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P2538154
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T22:08:19Z
    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 0x92c62ebad105e03ada4ea939fe74f468720f47a5d4dbbb976c9d6c2cfb128c29. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USX9P2538154.
      date published: 2026-07-20T22:08:19Z
    audio: A la deriva
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 73.25
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.401
      additional property: Energy
        type: PropertyValue
        value: 0.498
      additional property: Speechiness
        type: PropertyValue
        value: 0.036
      additional property: Acousticness
        type: PropertyValue
        value: 0.215
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.054
      additional property: Liveness
        type: PropertyValue
        value: 0.304
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.235
      additional property: Loudness (dB)
        type: PropertyValue
        value: -8.077
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Al caer la noche
  type: MusicAlbum
  date published: 2025-11-12