How to designate crypto conversion?

If I convert from one crypto to another, I understand it is a taxable event in the U.S. Does the filer have to specify that the transaction was a conversion or is the requirement to only list the purchase/sell information (date/amount for each transaction and gain or loss)?

I am thinking of converting bitcoin to Monero but do not want to tell the IRS I will hold Monero for privacy reasons unless I am legally required.

Thank you.