(Wallet+Chain) now .com is available in the market it is not operational, both the words are good you can think of crypto or currency or financial industry. see in terms of value, if i am a big brand i would go for .com no matter what. If i don't have that kind of capital i would look for an alternative like .co or .net. Now just by looking at the name, it does hold some value. I can not give you a real no but you never know.
Best of luck