Superficially, crypto exchanges and hawala seems kinda similar, exchange cash in and out in different places (though coin price in any fiat currency fluctuates

Superficially, crypto exchanges and hawala seems kinda similar, exchange cash in and out in different places (though coin price in any fiat currency fluctuates in ways the fiat currencies don't, usually). The blockchain provides the trust in absence of the social contract. Is this idea way off base?