SpeedProof - Speedometer

Some people have beat speeding tickets in the past with GPS loggers, this app logs your current speed, location and so on to a GPX file as fast as the GPS chip updates the system, but unlike other GPS loggers uses cryptography to make a tamper proof log which you can use to prove your speed.

I'm not a lawyer, use at own risk.

For more details check out our FAQ:
http://speedproof.odiousapps.com/faq.php