いとしき日々よ

Recording by Ken Hirai.

Recording identifiers

ISRC
JPN101100421
CopyrightID (CopyrightChains transaction hash)
0xf7b93fb69fb4f74be89294125288539227bf3d7990c1663f0e740030903338cd
Copyright registration time
2026-07-02T23:42:37+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp
2026-07-07T16:43:08Z
Bitcoin block
957064
Canonical record hash
sha256:0b05fe2df43245f583ee5176e652cac5f5e9c0bb16f7a8eb10b3701352c22a6d

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.