You would report the sale of the Crypto like you would report the sale of any security. On your Schedule D. You are correct that you can deduct a $3,000.00 loss, providing there are no other gains, per year until the balance is used up.
As far as the gain from the sale of a house, you didn't specify if it was a your primary residence or a rental property. Rental property would be a capital gain and would be offset by any capital loss. Personal property would be an ordinary gain. Thus, it won't be offset by any capital loss.