Let me ask you a question.
What stops someone from putting a bullet in your head and stealing all your stuff?
The answer is regulations.
This is not right. The answer is The Law.
One depends on an immutable understanding between human beings.
The other is political.
You're both wrong.
What prevents someone from putting a bullet in your head and stealing all your stuff is that you and bulletguy have neighbors, and cameras on every street corner, and two cameras and three localizers in every smartphone, and a blockchain to trace which wallet bought the gun and the bullet, and families, and a whole fucking society of 7 billion humans who don't like to receive bullets in their heads.
So they'd rapidly stop interacting (or worse) with antisocial pieces of shit that shoot people to take their stuff.
Moreover, there are ways to implement Basic Income in cryptocoin. That alone would stop all of crime committed for purely monetary reasons, if it's enough to survive on.