The Last Letter

Recording identifiers

ISRC

GBMFU0600032

CopyrightID (CopyrightChains transaction hash)

0xd4d9f5c6851211cc5eb5edcdb3062bf12943013ea680a53316bb039e97ac10e5

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T10:42:33Z

Bitcoin block

960247

Canonical record hash

sha256:cb5f6f1a2b24c211e972dcf5a759f7aabad9192f7941dde2513a39ab13e21f96

• 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.