Bloomberg) -- Peter Thiel, the technology billionaire and conservative political donor, praised cryptocurrencies and slammed central banks during an appearance on Wednesday. 

"You're supposed to just buy Bitcoin," he joked to an assembled crowd in Miami. "I feel like I've been underinvested in it." 

Thiel said his only hesitation about investing was that he thought "the secret was already known by everybody." He concluded that "I think the answers are still to go long" on Bitcoin. Adding: "Maybe it still is enough of a secret."