Many deals in Eve require trust. Sometimes the game mechanics offer some of the trust, such as with loan contracts. However, if you want something to happen, and that something relies completely on someone else doing it, how do you make sure they will?
I have heard of trusted third-party people, such as Chribba. They are often mentioned in tandem with nullsec alliance deals (such as the recent Atlas Surrendering deal) or other times they are mentioned as holders for the prizes and funds in a lottery that someone else is handling (e.g. F90OEX is the trusted partner for ShipsOfEve)
Where do these trusted guys hang out? How can I verify that a trusted third party guy is actually trusted by more than just the guy who wants my ISK?