Mazurkas, Op. 30: No. 4 in C-Sharp Minor

Recording identifiers

ISRC

USBC19803021

CopyrightID (CopyrightChains transaction hash)

0x85f2b15a2af200e8568427c10e6c9c555f14caa87cae03ce9a62d30470c4aa47

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-29T21:09:47Z

Bitcoin block

960144

Canonical record hash

sha256:535246d681664da6737a6f89d01c075d214b522d7a2d1842cb034878605aa1c3

• 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.