Marcin Urbaś
type: MusicGroup
description: Marcin Krzysztof Urbaś (born September 17, 1976) is a former Polish track and field athlete. He is the Polish record holder for the 200 metres dash with 19.98 seconds. He is now a sprinting coach. Tr
popularity: 15
followers: 20
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbb138ce151f297df2f8f1d6b449e30528e984cc296cbd0f48fb6a45147ea0684
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953697
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953697
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6b8221e4-4351-4947-84bc-cf53ab6d59bd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6b8221e4-4351-4947-84bc-cf53ab6d59bd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/6b8221e4-4351-4947-84bc-cf53ab6d59bd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T21:49:28Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xbb138ce151f297df2f8f1d6b449e30528e984cc296cbd0f48fb6a45147ea0684","name":"Marcin Urbaś","registered_at":"2026-06-14T15:41:26Z","symbol":"NIM0499082","token_address":"0x8ba71afb32de020318802124e2a90ff20abaca84","type":"artist","uuid":"6b8221e4-4351-4947-84bc-cf53ab6d59bd"}
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 0xbb138ce151f297df2f8f1d6b449e30528e984cc296cbd0f48fb6a45147ea0684. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b8221e4-4351-4947-84bc-cf53ab6d59bd.json and https://artists.proofprofile.net/proofs/artist/6b8221e4-4351-4947-84bc-cf53ab6d59bd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-14T21:49:28Z
  text: {"copyright_id":"0xbb138ce151f297df2f8f1d6b449e30528e984cc296cbd0f48fb6a45147ea0684","name":"Marcin Urbaś","registered_at":"2026-06-14T15:41:26Z","symbol":"NIM0499082","token_address":"0x8ba71afb32de020318802124e2a90ff20abaca84","type":"artist","uuid":"6b8221e4-4351-4947-84bc-cf53ab6d59bd"}