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How does EOS ensure contracts are deterministic? If WASM is used doesn't that mean developer can write non-deterministic contracts which break the network?

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I understand the properties of a pure function, given some input return the same output. This question is about how is determinism enforced? e.g. Are WASM op codes checked? or some other technique etc.

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    only deterministic wasm is allowed
    – confused00
    Commented Nov 5, 2018 at 10:42
  • @confused00 how so?
    – stacksonstacks
    Commented Nov 6, 2018 at 8:17

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All inputs are based on the shared data on a public ledger. There are no analog or non-deterministic input like the time of a day or random number generator.

  • Same inputs
  • Same code
  • Same results

= deterministic

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