"This is why proof of work needs to be expensive, if it is cheap you can roll back things easily. You want it to be very difficult to change history. The only way to make it difficult to change history is to make the process of writing the current history very expensive." —Jimmy Song
"Bitcoin is a optimist bet on the future, a bet on human ingenuity. Gold is a pessimist bet on the past and, often a bet the end of civilization." —Rodolfo Novak
"I realised, oh, this ledger is now being maintained on everyone’s computers in real time so no one can freeze it, no one can reverse it, no one can counterfeit, no one can double spend. That’s when it really clicked for me." —Charlie Shrem