1| >In fact, a team at (I think) Bell Labs came up with a "digital 1| >notary" service that did exactly this, in an efficient way. 2| I thought it was at BellCore by then? Stu Haber, IIRC. http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.46.8740 http://www.surety.com/ --dan