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  track: Piano Sonata No. 17 in B-Flat Major, K. 570: II. Adagio
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track: Flute Concerto in D Major, Op. 10, No. 3, RV 428, "Il gardellino": II. Cantabile
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Piano Concerto No. 26 in D Major, K. 537, "Coronation": I. Allegro
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Symphony No. 40 in G Minor, K. 550: II. Andante
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Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
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Piano Concerto No. 6 in B-Flat Major, K. 238: II. Andante un poco adagio
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String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
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Piano Sonata No. 17 in B-Flat Major, K. 570: II. Adagio
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Symphony No. 39 in E-Flat Major, K. 543: II. Andante con moto
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Così fan tutte, K. 588, Act I Scene 2: Terzet - Soave sia il vento
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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Mozart For Relaxation
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track: String Quartet No. 15 in D Minor, K. 421: Ii. Andante
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:53:27Z
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  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Serenade No. 13 in G Major, K. 525, "eine kleine Nachtmusik": Ii. Romanze: Andante
track: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
track: Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
track: String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
track: Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
track: Symphony No. 40 in G Minor, K. 550: Ii. Andante
track: Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
track: Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
track: Symphony No. 14 in A Major, K. 114: Ii. Andante
track: String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
track: Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
track: Vesperae solennes de Confessore, K. 339: V. Laudate Dominum

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OTSBitcoinBlockVerifyURL
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OTSVerificationAPI
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OTSTimestamp
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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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0e719cfca95da0ebc40d6ac033333a217864965629cf43f4518b091a2acad0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199274702.
date published: 2026-07-08T08:56:20Z

Serenade No. 13 in G Major, K. 525, "eine kleine Nachtmusik": Ii. Romanze: Andante
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Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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by artist: Hana Mullerova
by artist: Capella Istropolitana
by artist: Richard Edlinger
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
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by artist: Amadeus Chamber Orchestra of Polish Radio
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
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String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
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by artist: Eder Quartet
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
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Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
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Symphony No. 40 in G Minor, K. 550: Ii. Andante
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by artist: Barry Wordsworth
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Symphony No. 40 in G Minor, K. 550: Ii. Andante
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Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
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Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
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Symphony No. 14 in A Major, K. 114: Ii. Andante
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String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
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Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
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Vesperae solennes de Confessore, K. 339: V. Laudate Dominum
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Mozart For Study
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Piano Concerto No. 23 in A Major, K. 488: Ii. Adagio
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Symphony No. 40 in G Minor, K. 550: Ii. Andante
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Piano Sonata No. 12 in F Major, K. 332: Ii. Adagio
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Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
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Violin Sonata No. 17 in C Major, K. 296: Ii. Andante sostenuto
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Horn Concerto No. 3 in E-flat Major, K. 447: Ii. Romance: Larghetto
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subject of: OpenTimestamps Proof of Existence
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Mozart: Missa brevis, K. 65 & 194 - Offertorium, K. 22 & 277 - Graduale, K. 273 - Miserere, K. 85 - Ave verum, K. 618
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Mozart: Flute Concertos Nos. 1 and 2 / Andante in C Major
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Locatelli: Concerti Grossi, Op. 1, Nos. 1-6
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Mozart: Piano Concertos Nos. 21 and 25
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Mozart: Piano Concertos Nos. 1, 2, 3 and 4
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Mozart: Piano Concertos Nos. 6, 8 and 19
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