3 Pieces, Op. 2: III. Impromptu à la Mazur in C Major

Recording identifiers

ISRC

NLY331506838

Release date of the album this recording appears on

2015-09-04

CopyrightID (CopyrightChains transaction hash)

0xa8b5ca0cf429c544f2179a0e1258ca357e93efb1c27c50c547bd25efa9036fdf

Copyright registration time

2026-07-07T20:48:14+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:22:41Z

Bitcoin block

957120

Canonical record hash

sha256:3f53b1afe24bdec0f84e3c0564f8a8c30ba9389a497f414471de6c952ad8cce4

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLY331506838

What this proof establishes

This recording was released in 2015, 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.