Jan Kowalewski
type: MusicGroup
description: 175px|thumb|right|Jan Kowalewski Lt. Col. Jan Kowalewski (23 October 1892 – 31 October 1965) was a Polish cryptologist, intelligence officer, engineer, journalist, military commander, and creator and
popularity: 9
followers: 1
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd125dc940ab1e8ebd532a3bb0731390702e6a9e940f1b6b10ec8c8c32a790f28
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954742
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954742
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fe525049-a49e-4369-9d68-197b6f0f37e5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fe525049-a49e-4369-9d68-197b6f0f37e5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fe525049-a49e-4369-9d68-197b6f0f37e5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T20:46:40Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd125dc940ab1e8ebd532a3bb0731390702e6a9e940f1b6b10ec8c8c32a790f28","name":"Jan Kowalewski","registered_at":"2026-06-21T18:14:55Z","symbol":"NIM1998111","token_address":"0xba8a4d8a50a2679861b98f3e18dd2ee44b00580c","type":"artist","uuid":"fe525049-a49e-4369-9d68-197b6f0f37e5"}
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 0xd125dc940ab1e8ebd532a3bb0731390702e6a9e940f1b6b10ec8c8c32a790f28. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe525049-a49e-4369-9d68-197b6f0f37e5.json and https://artists.proofprofile.net/proofs/artist/fe525049-a49e-4369-9d68-197b6f0f37e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T20:46:40Z
  text: {"copyright_id":"0xd125dc940ab1e8ebd532a3bb0731390702e6a9e940f1b6b10ec8c8c32a790f28","name":"Jan Kowalewski","registered_at":"2026-06-21T18:14:55Z","symbol":"NIM1998111","token_address":"0xba8a4d8a50a2679861b98f3e18dd2ee44b00580c","type":"artist","uuid":"fe525049-a49e-4369-9d68-197b6f0f37e5"}