A Letter To Both Sides

Recording identifiers

ISRC

USMC19989339

CopyrightID (CopyrightChains transaction hash)

0x2f58e85802b55bb6db9d362e90039a5ad8c848a941a0be54e525654118c6f83f

Copyright registration time

2026-07-30T08:02:16+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-30T08:32:18Z

Bitcoin block

960230

Canonical record hash

sha256:495a3a702ebb4f4e58a9ec709473498960251495cdec7a1aa0313d2757244b0d

• 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.