Một Thời Đã Qua

Recording identifiers

ISRC

QM4TW2085540

CopyrightID (CopyrightChains transaction hash)

0x7e077789ed9399260bfa806fe8ee0a4a612cb1e0c2ccee2b35fe404a209ecf3b

Copyright registration time

2026-07-31T14:49:35+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-31T15:20:15Z

Bitcoin block

960418

Canonical record hash

sha256:1e221a14202a6d3c16713c31c0e4e7e51c2abf9ea3eddc1ae39fee0b71ba9930

• 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.