Tommi Hakala
type: MusicGroup
genre: opera
description: Tommi Hakala (born 9 August 1970) is a Finnish operatic baritone and winner of the 2003 BBC Singer of the World Competition in Cardiff. He was born in Riihimäki, Finland. Sources BBC News, "Finnish f
popularity: 6
followers: 105
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x81684aae4592954c9be232549447f8abe073cc99900137e558ef9bfe3cc368ea
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/eab58b5f-85fb-490b-828f-dc0c1598f499.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/eab58b5f-85fb-490b-828f-dc0c1598f499.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/eab58b5f-85fb-490b-828f-dc0c1598f499
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x81684aae4592954c9be232549447f8abe073cc99900137e558ef9bfe3cc368ea","name":"Tommi Hakala","registered_at":"2026-06-21T10:57:03Z","symbol":"NIM1904968","token_address":"0x9121ea8ff60b2a0609dc82acdb7d6ea7fce0cde6","type":"artist","uuid":"eab58b5f-85fb-490b-828f-dc0c1598f499"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81684aae4592954c9be232549447f8abe073cc99900137e558ef9bfe3cc368ea. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eab58b5f-85fb-490b-828f-dc0c1598f499.json and https://artists.proofprofile.net/proofs/artist/eab58b5f-85fb-490b-828f-dc0c1598f499.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0x81684aae4592954c9be232549447f8abe073cc99900137e558ef9bfe3cc368ea","name":"Tommi Hakala","registered_at":"2026-06-21T10:57:03Z","symbol":"NIM1904968","token_address":"0x9121ea8ff60b2a0609dc82acdb7d6ea7fce0cde6","type":"artist","uuid":"eab58b5f-85fb-490b-828f-dc0c1598f499"}
album: Sebastian Fagerlund: Höstsonaten
  type: MusicAlbum
  date published: 2018-10-05
album: Opera Arias (Baritone): Hakala, Tommi - Verdi, G. / Wagner, R. / Leoncavallo, R. / Puccini, G. / Giordano, U. / Gounod, C.F. / Mozart, W.A.
  type: MusicAlbum
  date published: 2004-01-01
track: Kullervo, Op. 7: III. Kullervo & His Sister
  type: MusicRecording
  duration: PT26M9S
  duration ms: 1569600
  explicit: false
  by artist: Jean Sibelius
  by artist: Lilli Paasikivi
  by artist: Tommi Hakala
  by artist: YL Male Voice Choir
  by artist: Minnesota Orchestra
  by artist: Osmo Vänskä
  in album: Sibelius: Kullervo, Op. 7
    type: MusicAlbum
    date published: 2020-10-02
  popularity: 4
  genre: classical
  genre: impressionism
  genre: post-romantic-era
  genre: finnish-classical
  isrc code: SEAEU1648030
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-30T16:39:29+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x7c125559111f8e60415d0c487c96e7469aca9c327662dc6dc547caa054c60319
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960284
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960284
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEU1648030
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-30T17:23:26Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c125559111f8e60415d0c487c96e7469aca9c327662dc6dc547caa054c60319. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEU1648030 — a six-check JSON result.
    date published: 2026-07-30T17:23:26Z
  audio: Kullervo, Op. 7: III. Kullervo & His Sister
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 144.692
    additional property: Musical Key
      type: PropertyValue
      value: 1
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.279
    additional property: Energy
      type: PropertyValue
      value: 0.142
    additional property: Speechiness
      type: PropertyValue
      value: 0.048
    additional property: Acousticness
      type: PropertyValue
      value: 0.971
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.005
    additional property: Liveness
      type: PropertyValue
      value: 0.103
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.04
    additional property: Loudness (dB)
      type: PropertyValue
      value: -23.634
    additional property: Key Name
      type: PropertyValue
      value: C#
    additional property: Mode Name
      type: PropertyValue
      value: Minor