Not that much, to be honest. His stance was mainly pro USD, but not calling for a ban or extensive taxation of cryptocurrencies as far as I know.

Biden on the other hand took a path of hard regulation and disinformation, like when they spread misinformation that bitcoin is used by terrorists and destabilizes the power grid when in fact the first one was proven to be a lie and the second one to be the other way around, as a power company from Texas claimed that miners are helping them to put load on the grid when one is needed.

It was Biden who supported a 30% bitcoin mining tax, which would kill the industry in the US.

I said it in another thread that trump is using Biden's anti-bitcoin card to his advantage, but that card was already on the table long before the election. Biden could have chosen to be neutral throughout his presidency, but no, he had to be negative and now it's going to cost him.