Mario Cassi
type: MusicGroup
genre: opera
description: Mario Cassi (born 6 December 1973) is an Italian baritone. Career Born in Arezzo, graduated in economics at University of Florence, Cassi studied singing privately first with Slavska Taskova Paolet
popularity: 2
followers: 29
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xce459c317843119cb9c3b8821535dd4ad4b340cc22ef880e51e0ad802723dd37
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954055
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954055
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/448111d1-45fc-4f7c-9a3e-0835aeb62faf.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/448111d1-45fc-4f7c-9a3e-0835aeb62faf.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/448111d1-45fc-4f7c-9a3e-0835aeb62faf
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T05:51:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xce459c317843119cb9c3b8821535dd4ad4b340cc22ef880e51e0ad802723dd37","name":"Mario Cassi","registered_at":"2026-06-16T13:27:04Z","symbol":"NIM1066040","token_address":"0x0eb996409b89fe1af9a7f5feb8d453c803a2fb92","type":"artist","uuid":"448111d1-45fc-4f7c-9a3e-0835aeb62faf"}
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 0xce459c317843119cb9c3b8821535dd4ad4b340cc22ef880e51e0ad802723dd37. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/448111d1-45fc-4f7c-9a3e-0835aeb62faf.json and https://artists.proofprofile.net/proofs/artist/448111d1-45fc-4f7c-9a3e-0835aeb62faf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0xce459c317843119cb9c3b8821535dd4ad4b340cc22ef880e51e0ad802723dd37","name":"Mario Cassi","registered_at":"2026-06-16T13:27:04Z","symbol":"NIM1066040","token_address":"0x0eb996409b89fe1af9a7f5feb8d453c803a2fb92","type":"artist","uuid":"448111d1-45fc-4f7c-9a3e-0835aeb62faf"}