Matti Lehtinen
type: MusicGroup
description: Matti Kalervo Lehtinen (24 April 1922 – 16 August 2022) was a Finnish operatic baritone, a long-term member of the Finnish National Opera, and professor of singing at the Sibelius Academy. He appe
popularity: 2
followers: 223
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd3eeb82df2368fa2bfbc0542ab21dbbb6feca760305efcffff439433e6a58651
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd3eeb82df2368fa2bfbc0542ab21dbbb6feca760305efcffff439433e6a58651","name":"Matti Lehtinen","registered_at":"2026-06-21T00:42:55Z","symbol":"NIM1766780","token_address":"0x0896c423078921b9a87823ed456161cdf66d224a","type":"artist","uuid":"cfebda46-c8c2-49f7-abe1-ae7cca91d70d"}
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 0xd3eeb82df2368fa2bfbc0542ab21dbbb6feca760305efcffff439433e6a58651. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.json and https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xd3eeb82df2368fa2bfbc0542ab21dbbb6feca760305efcffff439433e6a58651","name":"Matti Lehtinen","registered_at":"2026-06-21T00:42:55Z","symbol":"NIM1766780","token_address":"0x0896c423078921b9a87823ed456161cdf66d224a","type":"artist","uuid":"cfebda46-c8c2-49f7-abe1-ae7cca91d70d"}
album: Suven sävelmiä
  type: MusicAlbum
  date published: 1958
album: Matti Lehtinen, Sakari Halonen ja Ture Ara
  type: MusicAlbum
  date published: 1959
album: Matti Lehtinen
  type: MusicAlbum
  date published: 1959
album: Matti Lehtinen ja Anja Marvia
  type: MusicAlbum
  date published: 1960
album: Oi, muistatko vielä sen virren
  type: MusicAlbum
  date published: 1960
album: Yrjö Kilpisen yksinlauluja
  type: MusicAlbum
  date published: 1968
album: Lieder Recital
  type: MusicAlbum
  date published: 2014-01-01
album: Suomalaisia lauluja
  type: MusicAlbum
  date published: 2015-11-17
album: Runojen Äärellä
  type: MusicAlbum
  date published: 2015-11-20
album: My Way
  type: MusicAlbum
  date published: 2017-05-12