12 Variations on "Ein Mädchen oder Weibchen" for Cello and Piano, Op. 66: Variation I

Recording identifiers

ISRC

DEF059003922

CopyrightID (CopyrightChains transaction hash)

0xe9be8a1f7fa86c9519753b79135fba428fe8949222cab9ec9cefef5a80380251

Copyright registration time

2026-07-07T17:26:44+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:20:19Z

Bitcoin block

957118

Canonical record hash

sha256:32e66efaf743628ca6e297231e904778b523727d92b65e10f97e667d6617abbd

• Verify the CopyrightID on CopyrightChains
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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.