Mazurka No. 49 in A Minor, Op. 68 No. 2

Recording identifiers

ISRC

NLA507708547

Release date of the album this recording appears on

2025-02-07

CopyrightID (CopyrightChains transaction hash)

0xcf57114197d4b43f55a7c5983e70b1d5e7f9eb3e9ec22332731d72686fa70f79

Copyright registration time

2026-07-07T11:56:55+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:20:19Z

Bitcoin block

957118

Canonical record hash

sha256:9333157efee6b5445eb53b1abbd20e5a9c6c9a3f9727c8e74eda457ed22faffb

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLA507708547

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.