拝啓、いつかの君へ

Recording identifiers

ISRC

JPA961680017

CopyrightID (CopyrightChains transaction hash)

0x345d987e79ef31de9d094e2df0e6148004ddc5cbae8087f5bb2d6454feea5a70

Copyright registration time

2026-06-05T06:09:40+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-06-13T12:47:07Z

Bitcoin block

953513

Canonical record hash

sha256:153b4fcafe7e33eda5bb6d7c61ae2308f126b1cc55370be8730201eb4fb2d570

• 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.