Hymns & Variations: Var. 9

Recording by John Cage.

Recording identifiers

ISRC
FINDE2200018
CopyrightID (CopyrightChains transaction hash)
0x35fd7f07706137fa8e632be95eedfe62403502dbba60e4dc8442c69bc447c694
Copyright registration time
2026-07-07T13:42:01+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp
2026-07-08T03:20:19Z
Bitcoin block
957118
Canonical record hash
sha256:a749ba5b3d519517e4dd312ea5b9eecd8a593d3ca85351eb61855c546ee3d935

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.