Baby ZoE - first step towards Zerocash over Ethereum

• We've changed Parity to support a snark precompile: https://github.com/gancherj/parity/commit/b820abf755e216ccf24640549735412ec02dac62

• We've created an Ethereum contract: zoe/contract/

• We've implemented a primitive mixing circuit: https://github.com/ebfull/hackishlibsnarkbindings and bindings to libsnark for SNARK verification in Rust.

For more details, see our blog post and presentation slides (in PDF or OpenDocument Presentation format).