Each weekday leading up to devcon2, Nexus will highlight a dapp, library, or package (something with a dappfile ) as a promotion of our toolchain and as case studies for other developers. Yesterday's Post

Today's dapp is our first guest package. BTC Market theoretically lets you trade ERC20 tokens for real life Bitcoins in a proper atomic cross-chain trade using btc-relay. Rumor has it this dapp was almost working before its author was suddenly and decisively sidetracked by Maker.

https://github.com/makerdao/btc-market