Chopin: Nocturne No. 21 in C Minor, Op. Posth.

Recording identifiers

ISRC

FRZ119401810

CopyrightID (CopyrightChains transaction hash)

0x261ec3307340a79a5499a36667ef3d7a05ac53051b94643d83b4e5486e9288f3

Copyright registration time

2026-06-08T21:41:44+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-06-13T13:32:09Z

Bitcoin block

953520

Canonical record hash

sha256:8514c9fabd72ef4e0a993d986aae815ae990c8ea31f9164b9dd4ec5ad0f0bc8f

• 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.