I must say Vescudero is nut running any ponzi.
I've made several deposits and withdrawals in his 2% deposit with no problems.
And I've heard from others that they have succesfully withdrawed the money.
Every ponzi does that. If you couldn't successfully withdraw, nobody would deposit. Deposits are the lifeblood of a ponzi. So long as deposits exceed withdrawals, a ponzi schemer will generally continue to process withdrawals to maintan the positive cash flow into his pockets.
Also he has appeared in public and talked about bitcoins and his plans in the first spanish bitcoin meeting delivering some personal info.
What does that prove? Do you think it's impossible to know a criminal?
Almost every purported investment that claims unusually high returns relative to risk is either misrepresented (the risks are higher or the returns likely lower than claimed) or a ponzi scheme. The way you show that a such purported investment is not a ponzi is to demonstrate that there are actual legitimate investments taking place and that there's a source of funds for the withdrawals that results from profitable investment of the deposits rather than just the deposits themselves.