$MINA Free mining project era, website https://www.era3.cc, or scan the invitation code below to download the software, then register Mpc wallet, add me as a friend (search invitation code to add), click mine after passing, enter the invitation code to activate the network and you can mine. Not sure about the future prospects, anyway, it doesn't cost money, just activate it every day with your mobile phone, brothers who have nothing to do can try it.