Sonata II

Recording by John Cage.

Recording identifiers

ISRC
GBBBA7470702
CopyrightID (CopyrightChains transaction hash)
0xda455f1abb527fd8cd0c451db5443447022a017690f69e77d92a8aeeee8d25c3
Copyright registration time
2026-07-07T09:43:08+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp
2026-07-08T03:20:19Z
Bitcoin block
957118
Canonical record hash
sha256:397cc91c8427c7b1c3387700fe82c037d9a7445e90fe1151a5cf497f4b92788d

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.