Mario Petri
type: MusicGroup
genre: opera
description: Mario Petri (21 January 1922 – 26 January 1985) was an Italian operatic bass-baritone particularly associated with Mozart and Rossini roles. Life and career Petri was born in Perugia and began his ca
popularity: 11
followers: 203
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x90fa65071d76a7d4cd6c1272c48c6b580605e1963481f35d86c09b8aeec4f726
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953750
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953750
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a8cd204f-afd6-4c01-8c96-977f7c13c17d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a8cd204f-afd6-4c01-8c96-977f7c13c17d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a8cd204f-afd6-4c01-8c96-977f7c13c17d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T06:12:23Z
additional property: OTSCanonicalRecord
  type: PropertyValue
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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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fa65071d76a7d4cd6c1272c48c6b580605e1963481f35d86c09b8aeec4f726. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8cd204f-afd6-4c01-8c96-977f7c13c17d.json and https://artists.proofprofile.net/proofs/artist/a8cd204f-afd6-4c01-8c96-977f7c13c17d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T06:12:23Z
  text: {"copyright_id":"0x90fa65071d76a7d4cd6c1272c48c6b580605e1963481f35d86c09b8aeec4f726","name":"Mario Petri","registered_at":"2026-06-14T22:15:45Z","symbol":"NIM0593094","token_address":"0xa619ecef0f402c115553b21533a739a229cf609f","type":"artist","uuid":"a8cd204f-afd6-4c01-8c96-977f7c13c17d"}
album: Rossini: La cambiale di matrimonio
  type: MusicAlbum
  date published: 2014-08-29