João Marcos & Fernando
type: MusicGroup
genre: agronejo
genre: sertanejo
popularity: 13
followers: 3776
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc22f810fecec53cc3911c08e8d31832129aafcf87c1094e2f1b70d556b5bcd44
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953777
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953777
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d0346247-51b2-4c98-8206-cdf7e102f6a7.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d0346247-51b2-4c98-8206-cdf7e102f6a7.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d0346247-51b2-4c98-8206-cdf7e102f6a7
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T11:52:51Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc22f810fecec53cc3911c08e8d31832129aafcf87c1094e2f1b70d556b5bcd44","name":"João Marcos & Fernando","registered_at":"2026-06-15T02:30:15Z","symbol":"NIM0653890","token_address":"0x5cca2cfdddbdf50ae596f90a62b6a88aff59c835","type":"artist","uuid":"d0346247-51b2-4c98-8206-cdf7e102f6a7"}
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 0xc22f810fecec53cc3911c08e8d31832129aafcf87c1094e2f1b70d556b5bcd44. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0346247-51b2-4c98-8206-cdf7e102f6a7.json and https://artists.proofprofile.net/proofs/artist/d0346247-51b2-4c98-8206-cdf7e102f6a7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T11:52:51Z
  text: {"copyright_id":"0xc22f810fecec53cc3911c08e8d31832129aafcf87c1094e2f1b70d556b5bcd44","name":"João Marcos & Fernando","registered_at":"2026-06-15T02:30:15Z","symbol":"NIM0653890","token_address":"0x5cca2cfdddbdf50ae596f90a62b6a88aff59c835","type":"artist","uuid":"d0346247-51b2-4c98-8206-cdf7e102f6a7"}
album: Agronopinga
  type: MusicAlbum
  date published: 2018-08-27
album: Chifre no Asfalto
  type: MusicAlbum
  date published: 2018-11-01
album: Amor Velho
  type: MusicAlbum
  date published: 2019-01-01
album: Sofrendo Eu To
  type: MusicAlbum
  date published: 2019-01-01
album: Resenha
  type: MusicAlbum
  date published: 2019-06-16
  track: Resenha
    type: MusicRecording
    duration: PT2M43S
    duration ms: 163224
    explicit: false
    by artist: João Marcos & Fernando
    in album: Resenha
      type: MusicAlbum
      date published: 2019-06-16
    genre: agronejo
    genre: sertanejo
    isrc code: QZGLM1920230
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T01:38:42+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd28e6283416964979c194491448001da6d32cc8421fb9d70dbbffca75baa06f4
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956772
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956772
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZGLM1920230
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:01:46Z
    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 0xd28e6283416964979c194491448001da6d32cc8421fb9d70dbbffca75baa06f4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZGLM1920230 — a six-check JSON result.
      date published: 2026-07-05T10:01:46Z
    audio: Resenha
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 127.233
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.693
      additional property: Energy
        type: PropertyValue
        value: 0.913
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.178
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.056
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.864
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.105
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Ta Faltando Só um Love pra Mim
  type: MusicAlbum
  date published: 2019-09-17
album: O Sono Não Vem
  type: MusicAlbum
  date published: 2020-01-10
album: Os Brutos Chegou
  type: MusicAlbum
  date published: 2023-07-07
album: Os Cowboys
  type: MusicAlbum
  date published: 2023-09-29
  track: Os Cowboys
    type: MusicRecording
    duration: PT2M24S
    duration ms: 144586
    explicit: false
    by artist: João Marcos & Fernando
    in album: Os Cowboys
      type: MusicAlbum
      date published: 2023-09-29
    genre: agronejo
    genre: sertanejo
    isrc code: BXTB12300265
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-06-07T20:18:18+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd9d29f5367b7a98f3bae0e792843e67937b53fc0a2e2dceeb116a34afb413ecc
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 953515
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/953515
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXTB12300265
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-06-13T12:53:06Z
    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 0xd9d29f5367b7a98f3bae0e792843e67937b53fc0a2e2dceeb116a34afb413ecc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXTB12300265 — a six-check JSON result.
      date published: 2026-06-13T12:53:06Z
    audio: Os Cowboys
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 136.994
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
      additional property: Time Signature
      additional property: Danceability
      additional property: Energy
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Mode (Major/Minor)
type: PropertyValue
value: 0

Time Signature
type: PropertyValue
value: 6

Danceability
type: PropertyValue
value: 0.72

Energy
type: PropertyValue
value: 0.836

Speechiness
type: PropertyValue
value: 0.039

Acousticness
type: PropertyValue
value: 0.035

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.237

Valence (Positivity)
type: PropertyValue
value: 0.615

Loudness (dB)
type: PropertyValue
value: -8.621

Key Name
type: PropertyValue
value: D

Mode Name
type: PropertyValue
value: Minor