Marco Maciel
type: MusicGroup
description: Marco Antônio de Oliveira Maciel (21 July 1940 – 12 June 2021)Aos 80 anos, morre o ex-vice-presidente Marco Maciel was a Brazilian politician, lawyer, and law school professor who served as the 22nd
popularity: 7
followers: 4
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd1a5ac7a0703e5f805f1572a8d0457fa1a42e8af7b667c3fe2f7e132caf3ec56
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953924
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953924
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1d441d01-ba34-4071-ac63-5195b03a0a6d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1d441d01-ba34-4071-ac63-5195b03a0a6d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1d441d01-ba34-4071-ac63-5195b03a0a6d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T09:52:28Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd1a5ac7a0703e5f805f1572a8d0457fa1a42e8af7b667c3fe2f7e132caf3ec56","name":"Marco Maciel","registered_at":"2026-06-15T23:39:02Z","symbol":"NIM0868373","token_address":"0xc0623e8b707834069b4fb78c0bbbaf64b73be2af","type":"artist","uuid":"1d441d01-ba34-4071-ac63-5195b03a0a6d"}
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 0xd1a5ac7a0703e5f805f1572a8d0457fa1a42e8af7b667c3fe2f7e132caf3ec56. Chain 2 (Bitcoin): anchored in block 953924 (2026-06-16T09:52:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d441d01-ba34-4071-ac63-5195b03a0a6d.json and https://artists.proofprofile.net/proofs/artist/1d441d01-ba34-4071-ac63-5195b03a0a6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T09:52:28Z
  text: {"copyright_id":"0xd1a5ac7a0703e5f805f1572a8d0457fa1a42e8af7b667c3fe2f7e132caf3ec56","name":"Marco Maciel","registered_at":"2026-06-15T23:39:02Z","symbol":"NIM0868373","token_address":"0xc0623e8b707834069b4fb78c0bbbaf64b73be2af","type":"artist","uuid":"1d441d01-ba34-4071-ac63-5195b03a0a6d"}