Duo No. 1 pour Violon et Alto en Sol Majeur, K.423: I. Allegro

Recording identifiers

ISRC

FRZ148012010

Release date of the album this recording appears on

1981-02-20

CopyrightID (CopyrightChains transaction hash)

0x51730b48f1801c55aff281a4854abd47741bfec16cc3beea39d97b10fe42f670

Copyright registration time

2026-07-07T15:07:26+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:20:19Z

Bitcoin block

957118

Canonical record hash

sha256:d1e2384be1f956a92481b4d2533bf7d4b25851bade97e83243102abb5aca9b36

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC FRZ148012010

What this proof establishes

This recording was released in 1981, before generative AI. ProofProfile's catalogue derives from the pre-2022 AcousticBrainz and MusicBrainz source corpus, and 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.