[codingmyway]

Seems like they started authenticating a key (unknown6) that was previously being sent but not getting authenticated against.

A lot of bot writers are trying to break that authentication. Given that people are paying others to 'walk' their pokemon there is real money in faking GPS movement in the API.

[JorgeGT]

Or go middle way and spoof the GPS radio signal near the device: http://www.rtl-sdr.com/cheating-at-pokemon-go-with-a-hackrf-...

[methou]

This is illegal in most countries and may end up in a criminal court.

[curiousgal]

That is extremely overpowered, all you need is a rooted device with Xposed framework and a GPS spoofing app.

[JorgeGT]

I was (half-)joking :)