Marcos Fregnani-Martins
type: MusicGroup
genre: chamber music
popularity: 3
followers: 95
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x976dd927c1d27de720d7d71a51229af15448361347859e205468a43893e539f0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953949
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953949
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T13:28:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x976dd927c1d27de720d7d71a51229af15448361347859e205468a43893e539f0","name":"Marcos Fregnani-Martins","registered_at":"2026-06-15T19:45:23Z","symbol":"NIM0812641","token_address":"0x95c590fc4481c7989848ea5b431b85af8f654765","type":"artist","uuid":"11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50"}
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 0x976dd927c1d27de720d7d71a51229af15448361347859e205468a43893e539f0. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50.json and https://artists.proofprofile.net/proofs/artist/11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:28:01Z
  text: {"copyright_id":"0x976dd927c1d27de720d7d71a51229af15448361347859e205468a43893e539f0","name":"Marcos Fregnani-Martins","registered_at":"2026-06-15T19:45:23Z","symbol":"NIM0812641","token_address":"0x95c590fc4481c7989848ea5b431b85af8f654765","type":"artist","uuid":"11ab3d32-ae95-44c4-9cd8-0c4ef1dc5f50"}
album: Bax, Elgar, Mathias & Lloyd: British Chamber Music for Flute, Viola & Harp
  type: MusicAlbum
  date published: 2013-08-29