Etudes symphoniques, Op. 13: Anhang Variation 4

Recording identifiers

ISRC

NLE421100921

CopyrightID (CopyrightChains transaction hash)

0x139a732d66a333a42682b9e5b4559d2fe8940502788980fe5493efc0e8410fd8

Copyright registration time

2026-06-11T12:19:19+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-06-13T13:32:09Z

Bitcoin block

953520

Canonical record hash

sha256:dbcbbd9788cd329e0965a3bb91de57417c65bc0c281ec2e94eb9541f299a68d3

• 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.