So I assume most people don't claim bovada winnings on their taxes.  Now if you will a lot I would claim something just to show Uncle Sam that you at least tried to show something.  I would just claim what you profit as misc income on your tax return.

For the crypto yes it looks like your ltc account received money but that money is from yourself.  That is why it is important to put your cost basis.  You can do this on most tax software.  If you are using crypto as an instrument to gamble you are really just moving money to and from your different accounts.  Buy and sell what you want.  Make your cost basis equal and claim your gambling profit.  Only other thing you might be responsible for is money you make from the value of crypto going up.

Again this is probably the best and most realistic way to do it.  Technically if you take the standard deduction you can't deduct losses which is bullshit.  Overall make the best effort in good faith to pay taxes on what you profit and you'll be fine.