Jan Larsen
type: MusicGroup
genre: dansktop
description: Jan Larsen may refer to: Jan Larsen (footballer) (1945–1993), Danish football defender Jan Larsen (darts player) (born 1954), Danish darts player Jan Larsen (swimmer) (born 1967), Danish swimmer
popularity: 4
followers: 114
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa52f371d0f9e46d4cda88e8e65aa3fc6540e79a5942af0e5ff836bf52402477b
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/4aef0420-cbe7-44c2-a94d-79579c1718d6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4aef0420-cbe7-44c2-a94d-79579c1718d6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4aef0420-cbe7-44c2-a94d-79579c1718d6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa52f371d0f9e46d4cda88e8e65aa3fc6540e79a5942af0e5ff836bf52402477b","name":"Jan Larsen","registered_at":"2026-06-16T15:40:09Z","symbol":"NIM1097815","token_address":"0x39f0303bab436f2fb3b1bca06f0de9b071380300","type":"artist","uuid":"4aef0420-cbe7-44c2-a94d-79579c1718d6"}
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 0xa52f371d0f9e46d4cda88e8e65aa3fc6540e79a5942af0e5ff836bf52402477b. 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/4aef0420-cbe7-44c2-a94d-79579c1718d6.json and https://artists.proofprofile.net/proofs/artist/4aef0420-cbe7-44c2-a94d-79579c1718d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0xa52f371d0f9e46d4cda88e8e65aa3fc6540e79a5942af0e5ff836bf52402477b","name":"Jan Larsen","registered_at":"2026-06-16T15:40:09Z","symbol":"NIM1097815","token_address":"0x39f0303bab436f2fb3b1bca06f0de9b071380300","type":"artist","uuid":"4aef0420-cbe7-44c2-a94d-79579c1718d6"}
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