Marek Kaczmarek
type: MusicGroup
popularity: 15
followers: 5
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x732ca26f0664dace544a7d12645333e6c1adf8d651f41260a31197bcfbf329bb
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953807
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953807
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f1ece5f3-004b-4128-b960-f5196c41c416.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f1ece5f3-004b-4128-b960-f5196c41c416.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f1ece5f3-004b-4128-b960-f5196c41c416
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T16:39:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x732ca26f0664dace544a7d12645333e6c1adf8d651f41260a31197bcfbf329bb","name":"Marek Kaczmarek","registered_at":"2026-06-15T05:55:02Z","symbol":"NIM0702774","token_address":"0x2250f1de0476ab855cc07fdd81c591062e19de55","type":"artist","uuid":"f1ece5f3-004b-4128-b960-f5196c41c416"}
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 0x732ca26f0664dace544a7d12645333e6c1adf8d651f41260a31197bcfbf329bb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1ece5f3-004b-4128-b960-f5196c41c416.json and https://artists.proofprofile.net/proofs/artist/f1ece5f3-004b-4128-b960-f5196c41c416.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T16:39:18Z
  text: {"copyright_id":"0x732ca26f0664dace544a7d12645333e6c1adf8d651f41260a31197bcfbf329bb","name":"Marek Kaczmarek","registered_at":"2026-06-15T05:55:02Z","symbol":"NIM0702774","token_address":"0x2250f1de0476ab855cc07fdd81c591062e19de55","type":"artist","uuid":"f1ece5f3-004b-4128-b960-f5196c41c416"}