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genre: classical
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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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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42e8d967487f33214127da3783941ca9d6aa07973a86b9cac6f3229f518e12c. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe8e654c-f71a-448c-a5f8-39f13a0aa367.json and https://artists.proofprofile.net/proofs/artist/fe8e654c-f71a-448c-a5f8-39f13a0aa367.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T20:46:40Z
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track: Concerto for Flute and Harp in C Major, K. 299: II. Andantino

Concerto for Flute and Harp in C Major, K. 299: II. Andantino
type: MusicRecording
duration: PT8M36S
duration ms: 516000
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Hans Friedrich
by artist: Angelica Berger
by artist: Wiener Mozart Ensemble
by artist: Herbert Kraus
in album: Mozart, W.A.: Flute Concertos Nos. 1 and 2 / Concerto for Flute and Harp
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  date published: 2004-01-01
genre: classical
genre: classical-era
isrc code: USB8U1008337
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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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additional property: TokenDeploymentConfirmed
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e32935f45b55a350c1ece72bf4f99c8c9e95a33589d1ec26ddfa6e39249238e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USB8U1008337.
  date published: 2026-07-02T11:38:34Z
audio: Concerto for Flute and Harp in C Major, K. 299: II. Andantino
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  additional property: Key Name
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