Ever since sites like Silk Road showed the dark side of anonymous Bitcoin transactions, governments have been trying to regulate the crypto-currency. But a group of coders -- headed by 3D-printed gun creator Cody Wilson and Amir Taaki (above) -- want to keep that genie out of the bottle with a new app called Dark Wallet. It was first launched on Indiegogo, where it met its $50,000 funding goal, thanks in part to Bitcoin donations. The software could make it nearly impossible to trace the currency's flow, thanks to a one-two punch of encryption and "CoinJoin" technology. In brief, the latter code registers multiple transactions as a single movement of funds, masking transfers.