Very skeptical guys can look at alexa:
http://www.alexa.com/siteinfo/doublebot.comIn case of a Ponzi DoubleBot should be dead. Because to double money Ponzi needs new investors. DoubleBot has no new investors and even old investors are not using DoubleBot anymore. Did DoubleBot stop payments?
Go to the
https://DoubleBot.com page and you will find lot of proofs of payments, which are regular and based on an income from a Bitcoin/USD rate trading.