Unter vier Augen, Polka Mazur, Op. 15

Recording identifiers

ISRC

USSM11205612

CopyrightID (CopyrightChains transaction hash)

0x1f272560f36cea120f834df37e868389e01da856f2d35c50c71c4764b78ba9f6

Copyright registration time

2026-07-06T06:35:13+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-06T07:16:32Z

Bitcoin block

956891

Canonical record hash

sha256:11fe0f0ca8ec32fcbf2a9de0569c4a86bd6cee765d5d51af7693b44f66edf080

• 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.