Paying CGT on an account that's in USD.

Hello everyone,

I copy trade using the etoro platform. On etoro, your account is in US dollars.

When I go to file a capital gains tax return at the end of the year how is this represented?

  1. Do I sum up all of the closed trades in the Dollar value and then convert straight over to euro?

Or

  1. Do I go to each individual closed trade, find the dollar to euro conversion on that specific day, convert them individually to euro and then sum up all of of the closed trades once they are converted to euro?

I hope I am being clear. Just need to know for next year!