Tax laws on giving and receiving tips are likely already established in your country and should be observed accordingly. You will similarly convert the coins into their equivalent currency value in order to report as income, if required. In the United States, gifts are usually not taxed unless they reach a certain threshold ($15,000 in 2018). Utilizing a gifted crypto-currency, however, does create a taxable event, which you are responsible to pay taxes on.
As a recipient of a gift, you inherit the gifted coin’s cost basis. This means that if someone paid $1,000 for 1 BTC and then gifted it to you, the cost basis is set at $1,000. So if you go on to sell that 1 BTC for $6,000, you’ll incur a capital gain of $5,000, which will be taxed. It’s important to ask about the cost basis of any gift that you receive.
You can add tips and gifts that you've received to your Income Tab. You can find a summary of your Income (including tips and gifts) on your Report Tab.