Johan Kvarnström
type: MusicGroup
description: Johan Birger Matias Kvarnström (born 27 March 1986) is a Finland-Swedish politician currently serving in the Parliament of Finland for the Social Democratic Party of Finland at the Uusimaa constituenc
popularity: 50
followers: 835
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x391a9a0d1f383df6a41ec136e6fa2a7823915ec9b658108fb6fdb552d1e816c1
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/09409a92-9907-47d4-ad7b-6211973cb6a1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/09409a92-9907-47d4-ad7b-6211973cb6a1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/09409a92-9907-47d4-ad7b-6211973cb6a1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x391a9a0d1f383df6a41ec136e6fa2a7823915ec9b658108fb6fdb552d1e816c1","name":"Johan Kvarnström","registered_at":"2026-06-11T11:21:50Z","symbol":"NIM0012316","token_address":"0xa9858e9848b7cdc7d7ca0ff14669c26e3de2d19f","type":"artist","uuid":"09409a92-9907-47d4-ad7b-6211973cb6a1"}
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 0x391a9a0d1f383df6a41ec136e6fa2a7823915ec9b658108fb6fdb552d1e816c1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09409a92-9907-47d4-ad7b-6211973cb6a1.json and https://artists.proofprofile.net/proofs/artist/09409a92-9907-47d4-ad7b-6211973cb6a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:28:13Z
  text: {"copyright_id":"0x391a9a0d1f383df6a41ec136e6fa2a7823915ec9b658108fb6fdb552d1e816c1","name":"Johan Kvarnström","registered_at":"2026-06-11T11:21:50Z","symbol":"NIM0012316","token_address":"0xa9858e9848b7cdc7d7ca0ff14669c26e3de2d19f","type":"artist","uuid":"09409a92-9907-47d4-ad7b-6211973cb6a1"}
album: Guitar Covers (Vol. 4)
  type: MusicAlbum
  date published: 2023-06-02
album: Guitar Covers (Vol. 2)
  type: MusicAlbum
  date published: 2023-03-03
album: Guitar Covers (Vol. 5)
  type: MusicAlbum
  date published: 2023-06-23
album: Guitar Covers (Vol. 3)
  type: MusicAlbum
  date published: 2023-03-24
album: Guitar Covers (Vol. 1)
  type: MusicAlbum
  date published: 2022-12-16