In my country, there is none AFAIK. You need to go to their local center, bring your ID and related materials that can proof you're the owner of that number before you can port a new sim. But this doesn't mean there is no risk.

I guess the only possible way to hack this is if a hacker found a way to edit and replicate the national ID of the target. In short, you should protect your private information as strong as you could, don't ever leak any info online, and never expose to others that you own cryptocurrency.