bitcoins is fine, don’t be a zoomer.
Discussion
"It's raining, there's waters on my window."
"Ah, I love hiking, breathe in those fresh airs!"
"Ug, the beach, I have sands in my shoes."
that must have broken you, to write those three sentences
It’s a countable noun.
https://bitcoin.stackexchange.com/questions/1469/is-bitcoin-a-countable-noun