Mazurka No. 40 in F minor Op. 63 No. 2

Recording identifiers

ISRC

NLA507200243

Release date of the album this recording appears on

2025-02-10

CopyrightID (CopyrightChains transaction hash)

0xe4dc64f008133a95753180fe48ae5c16a1ee242b4355e40a580ed1b746017e01

Copyright registration time

2026-07-30T10:45:24+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T11:13:28Z

Bitcoin block

960250

Canonical record hash

sha256:7f9d780316e937dbfc6d93360938ef3ab290b903050278965f9329b976ce9c63

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLA507200243

What this proof establishes

This recording was released in 2025. ProofProfile's artist catalogue derives from the pre-2022 AcousticBrainz and MusicBrainz source corpus, and this recording entered the record through cc-db-prod's ISRC-linked registration. Its provenance rests on the dates stated above rather than on the era of that source corpus.

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.