String Quartet No. 4 in C, K.157: 2. Andante

Recording identifiers

ISRC

DEF058903842

CopyrightID (CopyrightChains transaction hash)

0x480280d2830ab7242d6de0493887337af49dae1d9e411fe105d8ea679b367fc2

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T12:51:24Z

Bitcoin block

960259

Canonical record hash

sha256:6c9b7fc5bb781dd9d50d31e9b09a38f7e60361a926fdbe3047cc6a5ff3311166

• Verify the CopyrightID on CopyrightChains
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• Read the machine-verifiable OTS result

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.