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This repository has been archived by the owner on Aug 7, 2023. It is now read-only.


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Cannon has moved to the Optimism monorepo!

This repository is an archive of the following Cannon versions:

  • v0.1.0: the original Cannon, implemented by geohot.
  • v0.2.0: improved Cannon, with bugfixes and experimental demos.
  • v0.3.0: refactored proof-format, initial Optimism Bedrock support.


Cannon (cannon cannon cannon) is an onchain MIPS instruction emulator. Cannon supports EVM-equivalent fault proofs by enabling Geth to run onchain, one instruction at a time, as part of an interactive dispute game.

  • It's Go code
  • ...that runs an EVM
  • ...emulating a MIPS machine
  • ...running compiled Go code
  • ...that runs an EVM


MIT, see LICENSE file.

Note: the code in this archived repository is unaudited. In NO WAY should it be used to secure any monetary value before testing and auditing. This is experimental software, and should be treated as such. The authors of this project make no guarantees of security of ANY KIND.