Open Transactions is an anonymous digital cash system based upon the Lucre anonymized cache cryptographic library. | MetaFilter - http://www.metafilter.com/111010...
"A digital cash system like Open Transactions might be considered the the opposite of Bitcoin because (1) it's actually anonymous, as opposed to exposed but poorly documented, (2) its coins offer little or usually no saving value, only transactional value, and (3) anyone can issue coins, but coins fundamentally represent a contractual obligation." - × × ×