Igor Cavalera
type: MusicGroup
description: Igor Graziano Cavalera (born 4 September 1970) is a Brazilian musician, best known as the former drummer for the heavy metal band Sepultura, which he co-founded with his brother Max in 1984. Max left
popularity: 21
followers: 497
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSRecordURL
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additional property: OTSTimestamp
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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
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40227be85dca43f2984211b4a2860c0fe1c27aac17a478a0be595c58d5b1564. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71729a0d-2074-4ba9-8665-98d62df63879.json and https://artists.proofprofile.net/proofs/artist/71729a0d-2074-4ba9-8665-98d62df63879.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0xe40227be85dca43f2984211b4a2860c0fe1c27aac17a478a0be595c58d5b1564","name":"Igor Cavalera","registered_at":"2026-06-12T00:52:25Z","symbol":"NIM0148057","token_address":"0xca29fd5a68e254fea81928b37f0d8f3801842741","type":"artist","uuid":"71729a0d-2074-4ba9-8665-98d62df63879"}
track: Mandando Bronca

Mandando Bronca
type: MusicRecording
duration: PT4M26S
duration ms: 266160
explicit: false
by artist: Pavilhão 9
by artist: Igor Cavalera
by artist: Max Cavalera
in album: Cadeia Nacional
  type: MusicAlbum
  date published: 1997-06-01
isrc code: BR03D2101617
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
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  value: true
additional property: ContentHash
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1f623f93fe9bfa8f32dae66e0bbfa5bf1a17a5a7aacb2b4e9f3e512bd5822c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BR03D2101617.
  date published: 2026-06-13T15:41:10Z
audio: Mandando Bronca
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Loudness (dB)
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  additional property: Key Name
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  additional property: Mode Name
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