Mazurkas, Op. 41: No. 4 in A-Flat

Recording identifiers

ISRC

USBC19803031

CopyrightID (CopyrightChains transaction hash)

0xb99c08556d8d40e45681db3d4ca0f9be926176236fb1f2a7834b00283dfcdf2e

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T04:47:22Z

Bitcoin block

960207

Canonical record hash

sha256:846084115490160112f62e6306f2206a046e4e5ff058e01cb990f4d11a9414cb

• 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.