Mazurkas, Op. 7: No. 2 in A Minor

Recording identifiers

ISRC

USBC19803027

CopyrightID (CopyrightChains transaction hash)

0x418deacd0e9e2b8ac87e48e9403c8f78fdf784e02cd0df5d5e2b50e5cf5ba032

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-22T11:35:32Z

Bitcoin block

959123

Canonical record hash

sha256:5205b830a64fca91b3bf01142a3bda0fed7330b825e5d22cfa913c1c7506e799

• 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.