String Quartet No.15 in D Minor, K. 421: IV. Allegretto ma non troppo

Recording identifiers

ISRC

FRZ141302080

CopyrightID (CopyrightChains transaction hash)

0x2e489f39e9f4efcd404556c9b72db686d9a107363b6988de8ec0f0c8c23c82de

Copyright registration time

2026-06-27T08:08:38+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-02T03:55:08Z

Bitcoin block

956304

Canonical record hash

sha256:6c2507e45bb202eb4a49402f43fb5be43d0d7f4201b4451bdd0926b5253fb36a

• Verify the CopyrightID on CopyrightChains
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What this proof establishes

This recording belongs to ProofProfile's historical evidence base derived from the pre-2022 AcousticBrainz and MusicBrainz corpus. ISRC is the stable recording-level bridge from that source corpus to the authoritative cc-db-prod track record.

CopyrightChains and Bitcoin OpenTimestamps make the exact committed record independently verifiable today. The cryptographic proof does not by itself establish authorship or ownership of the underlying recording.

Read the complete pre-generative-AI provenance and verification method.