Mazurka No. 41 in C sharp minor Op. 63 No. 3

Recording identifiers

ISRC

NLA507200244

CopyrightID (CopyrightChains transaction hash)

0x21b315f3d8cb9a6fb3002ae4a3b0e31cc9751f8d4d75b7db758e761c129cd2e9

Copyright registration time

2026-07-30T17:06:37+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T17:23:26Z

Bitcoin block

960284

Canonical record hash

sha256:7ad7750f5df926ca2dd9fc8184d06e7ddb786557a455e8aaacdb0c354e82daea

• 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.