Sigurjón Kjartansson
type: MusicGroup
description: Sigurjón Kjartansson (born 20 September 1968) is an Icelandic writer and producer. He is the co-creator of Katla and the showrunner of Trapped. He is also known for his role in the radio duo Tvíhöfði
popularity: 3
followers: 57
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6d8d25c2fb93efa38329ab21ec41000ab78c86549e06e03a176f9b1aa0cf4fea
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/4deca430-77d1-43b7-a22b-e5f1b6833c92.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4deca430-77d1-43b7-a22b-e5f1b6833c92.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4deca430-77d1-43b7-a22b-e5f1b6833c92
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6d8d25c2fb93efa38329ab21ec41000ab78c86549e06e03a176f9b1aa0cf4fea","name":"Sigurjón Kjartansson","registered_at":"2026-06-16T16:43:06Z","symbol":"NIM1112825","token_address":"0xd888824897380e8ef331e6a89fb0cfecfe788815","type":"artist","uuid":"4deca430-77d1-43b7-a22b-e5f1b6833c92"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8d25c2fb93efa38329ab21ec41000ab78c86549e06e03a176f9b1aa0cf4fea. 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/4deca430-77d1-43b7-a22b-e5f1b6833c92.json and https://artists.proofprofile.net/proofs/artist/4deca430-77d1-43b7-a22b-e5f1b6833c92.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0x6d8d25c2fb93efa38329ab21ec41000ab78c86549e06e03a176f9b1aa0cf4fea","name":"Sigurjón Kjartansson","registered_at":"2026-06-16T16:43:06Z","symbol":"NIM1112825","token_address":"0xd888824897380e8ef331e6a89fb0cfecfe788815","type":"artist","uuid":"4deca430-77d1-43b7-a22b-e5f1b6833c92"}