Two Pieces for String Quartet, Op. 36a: 2. Polka

Recording identifiers

ISRC

GBF071500032

CopyrightID (CopyrightChains transaction hash)

0xb7750a7fea8f825a4ed2b7aa5d5710d1dd2eaecd0747e0da9c56fcf5c0f71929

Copyright registration time

2026-07-06T09:51:13+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-07T14:41:13Z

Bitcoin block

957050

Canonical record hash

sha256:59b71a3be46ce78bfed3879cf10f41868d73a33e81ebfa6435e5f4c28c4cbaf0

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
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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.