Sandra Nurmsalu
type: MusicGroup
description: Sandra Nurmsalu (born 6 December 1988) is an Estonian singer, songwriter, and violinist. Recognized within Estonia for her genre-bending style, Nurmsalu has garnered success as both the lead singer of
popularity: 13
followers: 1797
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additional property: CopyrightChainExplorerURL
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additional property: OTSVerifyInstructions
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  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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  date published: 2026-06-15T00:33:41Z
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album: Väike Eestimaa
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  date published: 2013-12-03
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    by artist: Sandra Nurmsalu
    in album: Väike Eestimaa
      type: MusicAlbum
      date published: 2013-12-03
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    additional property: OTSVerifyInstructions
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      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
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      date published: 2026-07-14T21:26:15Z
    audio: Väike Eestimaa
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      additional property: Instrumentalness
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
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      additional property: Key Name
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        value: Bb
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album: Kui Tuuled Pöörduvad
  type: MusicAlbum
  date published: 2014-01-26
album: Soovide puu
  type: MusicAlbum
  date published: 2018-12-06
track: Kui Tuuled Pöörduvad (Club Edit)
track: Sel Teel

Kui Tuuled Pöörduvad (Club Edit)
type: MusicRecording
duration: PT3M59S
duration ms: 239228
explicit: false
by artist: Sandra Nurmsalu
in album: Moonwalk Street (Deluxe Version) - 77 Estonian Hits
  type: MusicAlbum
  date published: 2014-07-09
popularity: 21
isrc code: EECF11400002
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: Kui Tuuled Pöörduvad (Club Edit)
  type: AudioObject
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  additional property: Danceability
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Sel Teel
type: MusicRecording
duration: PT3M26S
duration ms: 206000
explicit: false
by artist: Sinine
by artist: Sandra Nurmsalu
in album: Dreams Come True
  type: MusicAlbum
  date published: 2012-10-19
popularity: 1
isrc code: DEU551213104
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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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
additional property: ProofProfileEvidenceStatus
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bb5778037c26292ecd3936c23b2adba0f0ab00fdb1a9054d75ef9e3acacac6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEU551213104.
  date published: 2026-07-08T03:53:27Z
audio: Sel Teel
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