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We've changed Parity to support a snark precompile: https://github.com/gancherj/parity/commit/b820abf755e216ccf24640549735412ec02dac62
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We've created an Ethereum contract:
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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).