Guitar Sonata, Op. 21, No. 2: II. Theme and Variations

Recording identifiers

ISRC

HKI199502905

CopyrightID (CopyrightChains transaction hash)

0xeff950949c8eed3b7269eb6c35c331450c410e2a080e47f8c60554b13ceb9808

Copyright registration time

2026-07-07T19:45:37+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:22:41Z

Bitcoin block

957120

Canonical record hash

sha256:d77f0c251e8fb1d16808275cfdc83b8a2d6e2f996cfbfb586b5bf335b29d9467

• 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.