Michał Matuszewski
type: MusicGroup
description: Michał Matuszewski (born January 6, 1993) is a Polish chess grandmaster. Chess career He achieved his GM norms at the: Polish Team Chess Championships Extraliga in May 2014 Druzynowe Mistrzostwa Pols
popularity: 3
followers: 311
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb82e8edf617813a2919ad8d60f14db2387b41937c9ce03f13f697d2e0aff4c2b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/93fd5bbe-f989-4845-89dc-45adb089d48d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb82e8edf617813a2919ad8d60f14db2387b41937c9ce03f13f697d2e0aff4c2b","name":"Michał Matuszewski","registered_at":"2026-06-17T17:17:54Z","symbol":"NIM1464588","token_address":"0x5d24335780a3329f5a0cb1469f054b55f578b7a4","type":"artist","uuid":"93fd5bbe-f989-4845-89dc-45adb089d48d"}
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 0xb82e8edf617813a2919ad8d60f14db2387b41937c9ce03f13f697d2e0aff4c2b. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.json and https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0xb82e8edf617813a2919ad8d60f14db2387b41937c9ce03f13f697d2e0aff4c2b","name":"Michał Matuszewski","registered_at":"2026-06-17T17:17:54Z","symbol":"NIM1464588","token_address":"0x5d24335780a3329f5a0cb1469f054b55f578b7a4","type":"artist","uuid":"93fd5bbe-f989-4845-89dc-45adb089d48d"}
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  type: MusicAlbum
  date published: 2019-08-06
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  type: MusicAlbum
  date published: 2021-05-12
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  type: MusicAlbum
  date published: 2022-11-15
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  type: MusicAlbum
  date published: 2024-01-14