João Martins
type: MusicGroup
genre: dub
genre: dub techno
description: João Martins is the name of: João Baptista Martins (1927–1993), Portuguese football forward João Carlos Martins (born 1940), Brazilian classical pianist João Paulo Neto Martins (born 1988), Portugues
popularity: 3
followers: 86
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xfa5d696f326aa5fe0f96feebc4054c97479f54d9484654b98df3bc491a56274d
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953947
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/234f8293-6d57-44e2-b77f-c486b002d288.ots
additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/234f8293-6d57-44e2-b77f-c486b002d288
additional property: OTSTimestamp
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  value: 2026-06-16T13:14:26Z
additional property: OTSCanonicalRecord
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5d696f326aa5fe0f96feebc4054c97479f54d9484654b98df3bc491a56274d. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/234f8293-6d57-44e2-b77f-c486b002d288.json and https://artists.proofprofile.net/proofs/artist/234f8293-6d57-44e2-b77f-c486b002d288.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:14:26Z
  text: {"copyright_id":"0xfa5d696f326aa5fe0f96feebc4054c97479f54d9484654b98df3bc491a56274d","name":"João Martins","registered_at":"2026-06-16T02:07:54Z","symbol":"NIM0903920","token_address":"0xcb72cff894f35723b52a9fea6cf8f0567a5623f5","type":"artist","uuid":"234f8293-6d57-44e2-b77f-c486b002d288"}
album: Fresh Start
  type: MusicAlbum
  date published: 2012
album: Ausencia EP
  type: MusicAlbum
  date published: 2013-03-20
album: First Love
  type: MusicAlbum
  date published: 2014-05-15
album: Obscurus EP
  type: MusicAlbum
  date published: 2014-10-25
album: Joao Martins
  type: MusicAlbum
  date published: 2019-01-07
track: Bate Papo
  type: MusicRecording
  duration: PT3M18S
  duration ms: 198840
  explicit: false
  by artist: Samba
  by artist: João Martins
  in album: Samba do Brasil (50 morceaux de pure samba)
    type: MusicAlbum
    date published: 2014-06-20
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  additional property: CopyrightID
  additional property: CopyrightStatus
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    type: PropertyValue
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  additional property: OTSBitcoinBlockVerifyURL
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR0W61472614
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  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 0xcbe16ba55d5908841ad094e3d6aa5f02602309490b5aa39b32235a6de6dc7b14. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR0W61472614.
    date published: 2026-07-08T03:20:19Z
  audio: Bate Papo
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 138.407
    additional property: Musical Key
      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.798
    additional property: Energy
      type: PropertyValue
      value: 0.993
    additional property: Speechiness
      type: PropertyValue
      value: 0.085
    additional property: Acousticness
      type: PropertyValue
      value: 0.45
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.789
    additional property: Liveness
      type: PropertyValue
      value: 0.089
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.754
    additional property: Loudness (dB)
      type: PropertyValue
      value: -10.472
    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
      type: PropertyValue
      value: Minor
track: Do Yoruba, A Luz, A Aurora Dos Deuses
  type: MusicRecording
  duration: PT3M48S
  duration ms: 228640
  explicit: false
  by artist: Samba
  by artist: João Martins
  in album: Samba do Brasil (50 morceaux de pure samba)
    type: MusicAlbum
    date published: 2014-06-20
  isrc code: FR0W61472618
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR0W61472618
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T22:27:44Z
  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 0xac5517a4b9bc82491e2c3b9005b58b56bcb955016bb25a9f00f0e73816fb3245. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR0W61472618.
    date published: 2026-07-31T22:27:44Z
  audio: Do Yoruba, A Luz, A Aurora Dos Deuses
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 140.838
    additional property: Musical Key
      type: PropertyValue
      value: 4
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.602
    additional property: Energy
      type: PropertyValue
      value: 0.958
    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

Speechiness
type: PropertyValue
value: 0.254

Acousticness
type: PropertyValue
value: 0.755

Instrumentalness
type: PropertyValue
value: 0.122

Liveness
type: PropertyValue
value: 0.407

Valence (Positivity)
type: PropertyValue
value: 0.73

Loudness (dB)
type: PropertyValue
value: -9.822

Key Name
type: PropertyValue
value: E

Mode Name
type: PropertyValue
value: Major