Last Ninja
type: MusicGroup
description: Last Ninja is a series of video games published by System 3. The first game in the series titled The Last Ninja, was released in 1987 for the Commodore 64 and was one of the most successful games for
popularity: 2
followers: 11
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8195d90665608b567cfe9d097b8b7f9bc5343d0af4d339e5daefd4890ecd419a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954623
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954623
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cbec3c0d-6390-4b81-bb44-4853e4031736.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cbec3c0d-6390-4b81-bb44-4853e4031736.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cbec3c0d-6390-4b81-bb44-4853e4031736
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:40:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x8195d90665608b567cfe9d097b8b7f9bc5343d0af4d339e5daefd4890ecd419a","name":"Last Ninja","registered_at":"2026-06-20T23:17:19Z","symbol":"NIM1744651","token_address":"0xb25181a2897faea6b0e68f63247411cbf5ce6cfd","type":"artist","uuid":"cbec3c0d-6390-4b81-bb44-4853e4031736"}
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 0x8195d90665608b567cfe9d097b8b7f9bc5343d0af4d339e5daefd4890ecd419a. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cbec3c0d-6390-4b81-bb44-4853e4031736.json and https://artists.proofprofile.net/proofs/artist/cbec3c0d-6390-4b81-bb44-4853e4031736.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-20T23:40:06Z
  text: {"copyright_id":"0x8195d90665608b567cfe9d097b8b7f9bc5343d0af4d339e5daefd4890ecd419a","name":"Last Ninja","registered_at":"2026-06-20T23:17:19Z","symbol":"NIM1744651","token_address":"0xb25181a2897faea6b0e68f63247411cbf5ce6cfd","type":"artist","uuid":"cbec3c0d-6390-4b81-bb44-4853e4031736"}