Trubanc is an anonymous, digitally-signed vault and trading system. Like Loom (https://loom.cc/), it allows anyone to issue assets (digital currencies). Unlike Loom, which relies entirely on (very good) obscurity for security, Trubanc`s digital signatures allow the bank and the customer to prove to each other that they agreed at a particular time on their balances. It does this while allowing destruction of transaction history for closed trades. Trubanc will initially provide server-based trading. Eventually, it will provide digital checks and bearer certificates. These, however, WILL require permanent storage of transaction history.