Nocturne no. 1 in b-flat major, op. 9 no. 1

Recording identifiers

ISRC

HKI199231301

CopyrightID (CopyrightChains transaction hash)

0xcd436a999d3c792484d7ed34f2139b1e18d5a4ed212b3b9bc384d4643d8dba7d

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-29T19:35:34Z

Bitcoin block

960138

Canonical record hash

sha256:5544aca8a6883730b282627c763613125268f47117b3c3c2fdce73890ec361f5

• 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.