Lennart Swahn
type: MusicGroup
description: Olof Algot Lennart Svahn, later Olof Lennart Swahn (8 April 1927 – 27 August 2008) was a Swedish journalist and radio and television personality. Early life Swahn was born on 8 April 1927 in Stockhol
popularity: 2
followers: 102
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xab7c519472e34cb2234a6079d01ec51be2aee08d8fe4a0b1e8458fa4bacf0430
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953932
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953932
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1eeb6a7c-0307-4b59-baaa-773290faa6bc.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1eeb6a7c-0307-4b59-baaa-773290faa6bc.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1eeb6a7c-0307-4b59-baaa-773290faa6bc
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T11:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xab7c519472e34cb2234a6079d01ec51be2aee08d8fe4a0b1e8458fa4bacf0430","name":"Lennart Swahn","registered_at":"2026-06-16T00:19:46Z","symbol":"NIM0878090","token_address":"0x36fdb86283f275de61f8d59b5ed0d7f7cec84c1e","type":"artist","uuid":"1eeb6a7c-0307-4b59-baaa-773290faa6bc"}
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 0xab7c519472e34cb2234a6079d01ec51be2aee08d8fe4a0b1e8458fa4bacf0430. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1eeb6a7c-0307-4b59-baaa-773290faa6bc.json and https://artists.proofprofile.net/proofs/artist/1eeb6a7c-0307-4b59-baaa-773290faa6bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
  text: {"copyright_id":"0xab7c519472e34cb2234a6079d01ec51be2aee08d8fe4a0b1e8458fa4bacf0430","name":"Lennart Swahn","registered_at":"2026-06-16T00:19:46Z","symbol":"NIM0878090","token_address":"0x36fdb86283f275de61f8d59b5ed0d7f7cec84c1e","type":"artist","uuid":"1eeb6a7c-0307-4b59-baaa-773290faa6bc"}
album: Barnboken - Lennart Swahn berättar sagor för John Blund
  type: MusicAlbum
  date published: 1972
album: Nu Tändas Tusen Juleljus
  type: MusicAlbum
  date published: 1972-10-01
album: Bibellandet
  type: MusicAlbum
  date published: 1983-05-09
album: Hej Tomtegubbar Julens sånger
  type: MusicAlbum
  date published: 2013-02-07