Yeah , there's a few to chose from , but I think Bitcoin will be the main one for quite some time......notwithstanding , it's actually the brilliance of the block chain technology that makes it the currency of the future - no one can dominate crypto's , no matter how much they buy.....it will relegate the existing currencies to history ,eventually ......it will also eliminate a lot of corrupt activity from financial institutions and governments........not sure what they'll do with all those nice old stone bank buildings though -turn them into museums , I suppose.