Upvoted for trolling block chain on block chain. :)
Block chain is not ponzi scheme. According my simple definition, ponzi needs mathematically to keep growing in order not to collapse. There is no such inbuilt mechanism in distributed ledger, by necessity. Various cryptocurrencies compete each other and other means of exchange for the total of global financial and other transactions. Purchasing power is the kingmaker, demand side without any supply is meaningless. Physical gold and silver in physical form are very clumsy for everyday payments, like buying an icecream or twitter corporation. And demurrage for upvoting your post with physical gold would be totally preventive.