Duet in B-Flat Major, Op. 21, No. 1: 1. Allegro

Recording identifiers

ISRC

US42M0430120

CopyrightID (CopyrightChains transaction hash)

0x492968b79366e05d8236746cc8ccaf795307f65e5bedff2f6f35819656a438ba

Copyright registration time

2026-07-30T00:36:21+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T00:53:20Z

Bitcoin block

960181

Canonical record hash

sha256:6c86394bf3de3a00f3514036dcab23fa8f5a8adb67c821ceb70a6a87e258fe14

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• 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.