Blas De Laserna
type: MusicGroup
description: Blas de Laserna Nieva (1751 in Corella, Navarra – 1816 in Madrid) was a Spanish composer. Biography Laserna was one of the most prolific and popular songwriters of late eighteenth and early nineteent
popularity: 2
followers: 98
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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 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
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track: Tonadilla (arr. G. Cassado for cello and piano)
  type: MusicRecording
  duration: PT1M29S
  duration ms: 89946
  explicit: false
  by artist: Blas De Laserna
  by artist: Gaspar Cassadó
  by artist: Michael Raucheisen
  in album: Cello Masterpieces: Gaspar Cassadó (Berlin 1935 - 1940)
    type: MusicAlbum
    date published: 2013-09-03
  isrc code: DEL111301653
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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 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
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0838e3053d6e9e8996b138afff46789ceaa7414e89865733a4db189a9c24064b. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEL111301653.
    date published: 2026-07-31T15:27:29Z
  audio: Tonadilla (arr. G. Cassado for cello and piano)
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    additional property: Tempo (BPM)
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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      value: Major