Jón Leifs
type: MusicGroup
description: thumb|Jón Leifs (1934) Jón Leifs (; born Jón Þorleifsson; 1 May 1899 – 30 July 1968) was an Icelandic composer, pianist, and conductor. Life Jón Leifs was born Jón Þorleifsson, at the farm Sólheimar,
popularity: 9
followers: 1305
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1b7707844f9165d569b389fc3b8e4048ed45eb0272473bc6c5fd1f4a1b159042
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/905f251f-8873-4407-9381-a5801d90727d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/905f251f-8873-4407-9381-a5801d90727d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/905f251f-8873-4407-9381-a5801d90727d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x1b7707844f9165d569b389fc3b8e4048ed45eb0272473bc6c5fd1f4a1b159042","name":"Jón Leifs","registered_at":"2026-06-17T16:02:22Z","symbol":"NIM1446557","token_address":"0xd96fb2d0e92f9a6cc59b256b8672296ea75b856d","type":"artist","uuid":"905f251f-8873-4407-9381-a5801d90727d"}
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 0x1b7707844f9165d569b389fc3b8e4048ed45eb0272473bc6c5fd1f4a1b159042. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/905f251f-8873-4407-9381-a5801d90727d.json and https://artists.proofprofile.net/proofs/artist/905f251f-8873-4407-9381-a5801d90727d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0x1b7707844f9165d569b389fc3b8e4048ed45eb0272473bc6c5fd1f4a1b159042","name":"Jón Leifs","registered_at":"2026-06-17T16:02:22Z","symbol":"NIM1446557","token_address":"0xd96fb2d0e92f9a6cc59b256b8672296ea75b856d","type":"artist","uuid":"905f251f-8873-4407-9381-a5801d90727d"}
album: Leifs: Edda, Pt. 2, Op. 42 "The Lives of the Gods"
  type: MusicAlbum
  date published: 2019-06-07
album: Leifs: Lay of Helgi the Hunding-Slayer (The) / Groa's Spell / Landfall / Iceland Cantata
  type: MusicAlbum
  date published: 2001-03-31