The following interview by Jonathan Logan was published in the February 2008 issue of Digital Gold Currency Magazine.
Wikipedia describes eCache as "an anonymous bank operating through interfaces in the Tor network. The bank issues cryptographic certificates, Digital Bearer Certificates, that can be exchanged among the bank's users. The certificates can be bought and sold for real money through the bank. The owners and operators of the bank are unknown, and the bank is said to operate outside the laws of any country." An eCache information and FAQ summary can be found here.
Interview with eCache Operators
For further reading:
"Anonymous internet banking", Wikipedia, the free encyclopedia
"eCache: Anonymous Digital Bearer Certificates", Mark Herpel, May 7, 2007
"New digital bearer cash site launched", Steve Schear, February 21, 2007
"Must Read: Stash the Cash", Charles Platt, Wired, August 1999
"Contracts with Bearer", Nick Szabo, 1999