>
> >because Bitcoin's basic security assumption is that a supermajority of
> miners are 'honest.'
>
> Only if you rely on SPV.
>

No, you rely on miners honesty even if you run a full node. This is in the
white paper. A dishonest miner majority can commit fraud against you, they
can mine only empty blocks, they can do various other things that render
your money worthless.