Tuna Académica da Universidade de Évora
type: MusicGroup
genre: fado
popularity: 7
followers: 454
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x87a95a112ab976dfa2c056ee9869320e045d991d427ffaddecd5ad9ce2210d37
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4bfed669-3c42-4f43-9639-007466a2e8e4.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4bfed669-3c42-4f43-9639-007466a2e8e4.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4bfed669-3c42-4f43-9639-007466a2e8e4
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x87a95a112ab976dfa2c056ee9869320e045d991d427ffaddecd5ad9ce2210d37","name":"Tuna Académica da Universidade de Évora","registered_at":"2026-06-16T16:00:29Z","symbol":"NIM1102663","token_address":"0xf8c499bcca4a6fe5fd79e9c510c0c3777b938aaa","type":"artist","uuid":"4bfed669-3c42-4f43-9639-007466a2e8e4"}
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 0x87a95a112ab976dfa2c056ee9869320e045d991d427ffaddecd5ad9ce2210d37. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bfed669-3c42-4f43-9639-007466a2e8e4.json and https://artists.proofprofile.net/proofs/artist/4bfed669-3c42-4f43-9639-007466a2e8e4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0x87a95a112ab976dfa2c056ee9869320e045d991d427ffaddecd5ad9ce2210d37","name":"Tuna Académica da Universidade de Évora","registered_at":"2026-06-16T16:00:29Z","symbol":"NIM1102663","token_address":"0xf8c499bcca4a6fe5fd79e9c510c0c3777b938aaa","type":"artist","uuid":"4bfed669-3c42-4f43-9639-007466a2e8e4"}
album: Além Tejo
  type: MusicAlbum
  date published: 1998-12-07
album: Ser Desta Tuna
  type: MusicAlbum
  date published: 2016-10-18
  track: Trazem No Peito Saudade
    type: MusicRecording
    duration: PT4M27S
    duration ms: 267306
    explicit: false
    by artist: Tuna Académica da Universidade de Évora
    in album: Ser Desta Tuna
      type: MusicAlbum
      date published: 2016-10-18
    genre: fado
    isrc code: QZDA71840878
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T21:27:59+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x4f8f2d91337c8fc280d0010ccec9312971b06f551788ba3369edfb21e4631488
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958785
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958785
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA71840878
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T21:40:06Z
    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 0x4f8f2d91337c8fc280d0010ccec9312971b06f551788ba3369edfb21e4631488. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZDA71840878.
      date published: 2026-07-19T21:40:06Z
    audio: Trazem No Peito Saudade
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 160.009
      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: 0.441
      additional property: Energy
        type: PropertyValue
        value: 0.541
      additional property: Speechiness
        type: PropertyValue
        value: 0.105
      additional property: Acousticness
        type: PropertyValue
        value: 0.565
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.321
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.592
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.324
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major