Tartu ülikooli kammerkoor / University of Tartu Chamber Choir
type: MusicGroup
genre: choral
genre: neoclassical
popularity: 4
followers: 22
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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additional property: OTSCanonicalRecord
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace16f85daac7e99e3b0cabcbe62982319878638c47689c17edb30af49b729a4. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dad50103-d5ad-4c87-bf9d-2550334ffecf.json and https://artists.proofprofile.net/proofs/artist/dad50103-d5ad-4c87-bf9d-2550334ffecf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T04:51:12Z
  text: {"copyright_id":"0xace16f85daac7e99e3b0cabcbe62982319878638c47689c17edb30af49b729a4","name":"Tartu ülikooli kammerkoor / University of Tartu Chamber Choir","registered_at":"2026-06-21T04:30:55Z","symbol":"NIM1820564","token_address":"0x6c9aea3072b660f32154a6290208e7380786d597","type":"artist","uuid":"dad50103-d5ad-4c87-bf9d-2550334ffecf"}
album: Ilma Hääl / Tone Of The World
  type: MusicAlbum
  date published: 2021-06-13
  track: Canticle Of The Sun: XI. Sister Death
    type: MusicRecording
    duration: PT2M44S
    duration ms: 164239
    explicit: false
    by artist: Tartu ülikooli kammerkoor / University of Tartu Chamber Choir
    in album: Ilma Hääl / Tone Of The World
      type: MusicAlbum
      date published: 2021-06-13
    genre: choral
    genre: neoclassical
    isrc code: EEPJ32100025
    additional property: CopyrightID
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      value: https://blockstream.info/api/block-height/958650
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/EEPJ32100025
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T03:36:41Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59b54d2d4d0fda79b88b3b8a56b4c776239ed75d7181fb19a3cda76c1ee6819. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/EEPJ32100025.
      date published: 2026-07-19T03:36:41Z
    audio: Canticle Of The Sun: XI. Sister Death
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 88.282
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.116
      additional property: Energy
        type: PropertyValue
        value: 0.051
      additional property: Speechiness
        type: PropertyValue
        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.98
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.112
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.037
      additional property: Loudness (dB)
        type: PropertyValue
        value: -25.892
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major