Helena Ferreira
type: MusicGroup
popularity: 2
followers: 48
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd38bdf3403effeb041211e08018dad87cd4e442d14df09a0e934f094d1d6c19a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953907
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953907
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1608eab6-435d-4ef3-b6b1-b37b6229dd4a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1608eab6-435d-4ef3-b6b1-b37b6229dd4a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1608eab6-435d-4ef3-b6b1-b37b6229dd4a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd38bdf3403effeb041211e08018dad87cd4e442d14df09a0e934f094d1d6c19a","name":"Helena Ferreira","registered_at":"2026-06-15T21:17:14Z","symbol":"NIM0834522","token_address":"0x0f62822a6d273a45ab72c6a5240ff0d12386863c","type":"artist","uuid":"1608eab6-435d-4ef3-b6b1-b37b6229dd4a"}
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 0xd38bdf3403effeb041211e08018dad87cd4e442d14df09a0e934f094d1d6c19a. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1608eab6-435d-4ef3-b6b1-b37b6229dd4a.json and https://artists.proofprofile.net/proofs/artist/1608eab6-435d-4ef3-b6b1-b37b6229dd4a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:53:13Z
  text: {"copyright_id":"0xd38bdf3403effeb041211e08018dad87cd4e442d14df09a0e934f094d1d6c19a","name":"Helena Ferreira","registered_at":"2026-06-15T21:17:14Z","symbol":"NIM0834522","token_address":"0x0f62822a6d273a45ab72c6a5240ff0d12386863c","type":"artist","uuid":"1608eab6-435d-4ef3-b6b1-b37b6229dd4a"}
album: 13Th in My Hate List
  type: MusicAlbum
  date published: 2025-04-13
album: Airport Piano Player
  type: MusicAlbum
  date published: 2025-04-13
  track: Airport Piano Player
    type: MusicRecording
    duration: PT3M23S
    duration ms: 203668
    explicit: false
    by artist: Helena Ferreira
    in album: Airport Piano Player
      type: MusicAlbum
      date published: 2025-04-13
    isrc code: QZMZ92542374
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T01:28:22+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xea841dc44d3bddbe942e1ae68425574d154dfad6bb2844017f9858e7f22493e3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956745
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956745
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMZ92542374
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T05:33:35Z
    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 0xea841dc44d3bddbe942e1ae68425574d154dfad6bb2844017f9858e7f22493e3. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZMZ92542374.
      date published: 2026-07-05T05:33:35Z
    audio: Airport Piano Player
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 159.427
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.427
      additional property: Energy
        type: PropertyValue
        value: 0.191
      additional property: Speechiness
        type: PropertyValue
        value: 0.029
      additional property: Acousticness
        type: PropertyValue
        value: 0.907
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.101
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.33
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.047
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor