Nocturne No. 20 in C-Sharp Minor, Op. Posth.

Recording identifiers

ISRC

FRUM78100051

CopyrightID (CopyrightChains transaction hash)

0xd900e5a0c01dc08c65ae7cb5c8b780986f8f86b95586d8066c3e6cea6596745d

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-08-01T03:13:03Z

Bitcoin block

960500

Canonical record hash

sha256:75870ff67485c25bbf3e01b2aa6b3b0e958d912f8436fd261cfbd43e865af466

• 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.