I'm not so sure your dad would be comfortable with vaults if you explained how they worked correctly... The name "vault" has nothing to do with how they actually work.
Multisig is much simpler to explain properly. And it has direct real world analogies like multi-signature bank accounts.
I didn't mean the vault analogy is apt (although I have to admit it's good marketing). If-this-then-that UX does seem more straightforward than multi-sig combinatorics even if it's mostly a placebo.
Honestly, this is the first I've heard of multi-sig bank accounts. I need more money.
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“even if it's mostly a placebo”
We should be creating real solutions. Not placebos.
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