João Ferreira
type: MusicGroup
description: João Ferreira may refer to: Bigode (João Ferreira, 1922–2003), Brazilian footballer João Augusto Ferreira de Almeida (1873–1917), executed Portuguese soldier João Ferreira (politician) (born 1978)
popularity: 8
followers: 196
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc02eff9d212f045684e6c1b38b6df314d4241fde2aeff390059a5228d25f5969
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc02eff9d212f045684e6c1b38b6df314d4241fde2aeff390059a5228d25f5969","name":"João Ferreira","registered_at":"2026-06-20T14:47:03Z","symbol":"NIM1633421","token_address":"0xed4f482af6780e8239658f6c0179df12dd43a2e8","type":"artist","uuid":"b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd"}
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 0xc02eff9d212f045684e6c1b38b6df314d4241fde2aeff390059a5228d25f5969. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd.json and https://artists.proofprofile.net/proofs/artist/b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xc02eff9d212f045684e6c1b38b6df314d4241fde2aeff390059a5228d25f5969","name":"João Ferreira","registered_at":"2026-06-20T14:47:03Z","symbol":"NIM1633421","token_address":"0xed4f482af6780e8239658f6c0179df12dd43a2e8","type":"artist","uuid":"b5c0ff2c-6693-4b3e-8939-cfcc9eca46bd"}
album: Dois Violões
  type: MusicAlbum
  date published: 2016-06-28
album: Quem É
  type: MusicAlbum
  date published: 2017-04-27
album: Luau
  type: MusicAlbum
  date published: 2017-11-07
album: Baião de Corda
  type: MusicAlbum
  date published: 2021-07-16
album: Aiteall
  type: MusicAlbum
  date published: 2022-01-10
album: Singela
  type: MusicAlbum
  date published: 2022-07-02
track: Cumplicidades
  type: MusicRecording
  duration: PT4M27S
  duration ms: 267477
  explicit: false
  by artist: Putumayo
  by artist: Língua Terra
  by artist: Manecas Costa
  by artist: Paulo Flores
  by artist: Swami Jr.
  by artist: Guilherme Kastrup
  by artist: Beth Beli
  by artist: João Ferreira
  by artist: Jackie Cunha
  by artist: Lenna Bahule
  in album: African Acoustic by Putumayo
    type: MusicAlbum
    date published: 2023-09-29
  genre: musica-andina-colombiana
  isrc code: US6QR2200006
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  additional property: CopyrightStatus
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    value: registered
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    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xd38c0f74990175154af9fdfe553d609edcb1a7076951c46b40df836abcd0ed3c
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 953520
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/953520
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US6QR2200006
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-06-13T13:32:09Z
  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 0xd38c0f74990175154af9fdfe553d609edcb1a7076951c46b40df836abcd0ed3c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US6QR2200006.
    date published: 2026-06-13T13:32:09Z
  audio: Cumplicidades
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 120.43
    additional property: Musical Key
      type: PropertyValue
      value: 2
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.58
    additional property: Energy
      type: PropertyValue
      value: 0.401
    additional property: Speechiness
      type: PropertyValue
      value: 0.051
    additional property: Acousticness
      type: PropertyValue
      value: 0.911
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.02
    additional property: Liveness
      type: PropertyValue
      value: 0.106
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.625
    additional property: Loudness (dB)
      type: PropertyValue
      value: -19.021
    additional property: Key Name
      type: PropertyValue
      value: D
    additional property: Mode Name
      type: PropertyValue
      value: Minor
track: Cumplicidades
  type: MusicRecording
  duration: PT4M27S
  duration ms: 267477
  explicit: false
  by artist: Putumayo
  by artist: Língua Terra
  by artist: Swami Jr.
  by artist: Beth Beli
  by artist: Guilherme Kastrup
  by artist: João Ferreira
  by artist: Lenna Bahule
  by artist: Manecas Costa
  by artist: Jackie Cunha
  by artist: Paulo Flores
  in album: Acoustic World by Putumayo
    type: MusicAlbum
    date published: 2022-04-08
  genre: musica-andina-colombiana
  isrc code: US6QR2200006
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-11T14:26:29+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xd38c0f74990175154af9fdfe553d609edcb1a7076951c46b40df836abcd0ed3c
  additional property: OTSHash
  additional property: OTSBitcoinBlock
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    value: 957124
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957124
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US6QR2200006
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:53:27Z
  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 0xd38c0f74990175154af9fdfe553d609edcb1a7076951c46b40df836abcd0ed3c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US6QR2200006.
    date published: 2026-07-08T03:53:27Z
  audio: Cumplicidades

Cumplicidades
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 120.43
additional property: Musical Key
  type: PropertyValue
  value: 2
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.58
additional property: Energy
  type: PropertyValue
  value: 0.401
additional property: Speechiness
  type: PropertyValue
  value: 0.051
additional property: Acousticness
  type: PropertyValue
  value: 0.911
additional property: Instrumentalness
  type: PropertyValue
  value: 0.02
additional property: Liveness
  type: PropertyValue
  value: 0.106
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.625
additional property: Loudness (dB)
  type: PropertyValue
  value: -19.021
additional property: Key Name
  type: PropertyValue
  value: D
additional property: Mode Name
  type: PropertyValue
  value: Minor