User blog comment:Blackendedsoul/Law's Bounty and the World Government's Treasury!/@comment-4754162-20120312114334/@comment-4754162-20120312150209

Hey, thats plausible! Very good point! That would explain the need of the 100 live beating hearts (desparately). If this is truly the case, then I'd assume Vegapunk already had a way to pull out a heart and placing it into a PX before it stops beating, though as you state may be a complex procedure.