手紙を書こう

Recording by Wataru Takada.

Recording identifiers

ISRC
JPKI07251951
CopyrightID (CopyrightChains transaction hash)
0x9f2c3783d658561e9063d227f1699538a8a0f4bdc4bddd9f2318473bca03b89e
Copyright registration time
2026-07-07T20:42:55+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp
2026-07-08T03:39:04Z
Bitcoin block
957122
Canonical record hash
sha256:842095f4b85314e8e517a6c834cb971aaba48d6e39152f9b356a71aeadf6ef92

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.