Interesting concept:

Designers Juan José Monsalve, Andrés Roi, and Cristóbal Cabello say on their Yerka Project website that their prototype bike “looks like a traditional bike to the naked eye, but it’s the safest bicycle you’ll find” because “we decided to make a lock out of the frame” so “the only way to steal it is to break the lock, which implies breaking the bike.”

Be sure to check out the video at the project’s website to get a better idea of how it works.