Free Duo
type: MusicGroup
genre: bossa nova
popularity: 2
followers: 182
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc1b6d1984e7518d777eba689d711127d3df9b0aceb744387c618aae95171d6e5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/76812e6f-359c-4703-addc-a81f06fdf01d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/76812e6f-359c-4703-addc-a81f06fdf01d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/76812e6f-359c-4703-addc-a81f06fdf01d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc1b6d1984e7518d777eba689d711127d3df9b0aceb744387c618aae95171d6e5","name":"Free Duo","registered_at":"2026-06-17T06:53:20Z","symbol":"NIM1315703","token_address":"0x55276e746430481b7303bec7163b8e7ebacd0730","type":"artist","uuid":"76812e6f-359c-4703-addc-a81f06fdf01d"}
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 0xc1b6d1984e7518d777eba689d711127d3df9b0aceb744387c618aae95171d6e5. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76812e6f-359c-4703-addc-a81f06fdf01d.json and https://artists.proofprofile.net/proofs/artist/76812e6f-359c-4703-addc-a81f06fdf01d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xc1b6d1984e7518d777eba689d711127d3df9b0aceb744387c618aae95171d6e5","name":"Free Duo","registered_at":"2026-06-17T06:53:20Z","symbol":"NIM1315703","token_address":"0x55276e746430481b7303bec7163b8e7ebacd0730","type":"artist","uuid":"76812e6f-359c-4703-addc-a81f06fdf01d"}
album: Night and Day Music for Cocktails Brazilian Popular Songs
  type: MusicAlbum
  date published: 2019-09-20
  track: A felicidade
    type: MusicRecording
    duration: PT3M38S
    duration ms: 218143
    explicit: false
    by artist: Free Duo
    by artist: Giacomo Bondi
    in album: Night and Day Music for Cocktails Brazilian Popular Songs
      type: MusicAlbum
      date published: 2019-09-20
    genre: bossa-nova
    isrc code: ITR551900142
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-22T18:14:40+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x332de94d6c75675f1f2d65deda9d8c08558d8f042d2c3a857020a591570c09e8
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959163
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959163
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITR551900142
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T18:47:29Z
    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 0x332de94d6c75675f1f2d65deda9d8c08558d8f042d2c3a857020a591570c09e8. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITR551900142 — a six-check JSON result.
      date published: 2026-07-22T18:47:29Z
    audio: A felicidade
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 107.034
      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: 0.514
      additional property: Energy
        type: PropertyValue
        value: 0.247
      additional property: Speechiness
        type: PropertyValue
        value: 0.031
      additional property: Acousticness
        type: PropertyValue
        value: 0.885
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.108
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.293
      additional property: Loudness (dB)
        type: PropertyValue
        value: -14.784
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major