upon the recent events in the filed, there r two topics interesting enough to dig more.

  1. the security issue of pos wallet. The theft case just happened to NXT, but what could happen to ppc, black coin etc. Is there any difference among all those pos wallets?

  2. Chinese exchanges are picking up the solution of ”prove of solvency" , merkle tree and multisig once again raise up to the attention of public. It seems to me all current solutions more or less have drawbacks, then it is good to make comparison among all those solutions. what is more, it is very interesting for thinking about btce ,bitstamp remaining silent for this issue for this long, and someone may like to talk about it