HOW DOES OPEN TRANSACTIONS COMPARE TO eCache?
eCache is an actual, anonymous internet bank, whereas Open Transactions is the sort of software that such a bank might run. (As a library, OT has many more uses than this, but this is a pretty good description for the OT server software.) As far as I know, eCache supports a “Tor / HTTPS, Cash-Only Interface” like the one described in this FAQ, and their users exchange bearer tokens through it, backed in gold and other precious metals.