AudioSeal hides a 16-bit message in speech, spread so thinly you can't hear it. A second network listens for it sample by sample, so it can show which parts of a clip carry the mark, and read the message back.
Tap the dots to pick the message. Then try to break it: noise, cuts and volume barely touch it, and changing the speed wipes it out.
The sample is Neil Armstrong on the Moon, 1969 (NASA, public domain). You can also stamp your own recording or file; it never leaves your device.
Runs on your device. Your voice is never uploaded.
Hide an ID in a voice clip where you can't hear it. Then try to scrub it off.