What this actually proves
A Sonodrift certificate records the engine version, seed, and every board setting that produced a track. Because the engine is deterministic, re-running it with those inputs reproduces the audio bit for bit — so this page doesn't check a signature and ask you to trust us. It re-creates the audio from scratch, right here in your browser, and compares cryptographic hashes.
- Re-render — the audio is regenerated from the certificate's inputs and its hash compared. This is the un-fakeable check: a recording swapped in from anywhere else cannot survive it, because the regeneration produces different audio.
- File match — if you supply the .wav, it is hashed and compared to the certified hash, proving the file in your hands is the certified one.
- Version — certificates verify against the exact engine version that minted them; every released version stays available, so certificates remain checkable forever.
Nothing leaves your device: the certificate and audio are read locally, the engine runs locally, and this site has no server to receive anything.