MC Lars
type: MusicGroup
description: Andrew Robert Nielsen (born October 6, 1982), known professionally as MC Lars, is an American rapper, producer, educator, and founder of Horris Records. A graduate of Stanford University and the Unive
popularity: 4
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7409c00cad4f38c52046faff9fb5f6726a6a8348f917830105f9f4989c3d8c95
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/544ffd35-8146-4462-9604-6762032ed695.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/544ffd35-8146-4462-9604-6762032ed695.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/544ffd35-8146-4462-9604-6762032ed695
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7409c00cad4f38c52046faff9fb5f6726a6a8348f917830105f9f4989c3d8c95","name":"MC Lars","registered_at":"2026-06-16T19:16:40Z","symbol":"NIM1149459","token_address":"0xe6a128cc0364c78834ca327c7ce360a942a61938","type":"artist","uuid":"544ffd35-8146-4462-9604-6762032ed695"}
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 0x7409c00cad4f38c52046faff9fb5f6726a6a8348f917830105f9f4989c3d8c95. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/544ffd35-8146-4462-9604-6762032ed695.json and https://artists.proofprofile.net/proofs/artist/544ffd35-8146-4462-9604-6762032ed695.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0x7409c00cad4f38c52046faff9fb5f6726a6a8348f917830105f9f4989c3d8c95","name":"MC Lars","registered_at":"2026-06-16T19:16:40Z","symbol":"NIM1149459","token_address":"0xe6a128cc0364c78834ca327c7ce360a942a61938","type":"artist","uuid":"544ffd35-8146-4462-9604-6762032ed695"}