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I would like to check the code hash of an account from within my smart contract. Is this possible?

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Update Actually, you don't have access to account_object from the contract.

You can use account.code_version.

See https://github.com/EOSIO/eos/blob/0f6695cb8d31e3d2f318d1720e9d9ad23e1ce80d/libraries/chain/eosio_contract.cpp#L151

From cleos do: cleos get code <accountName>

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    The question asks how to do it from within a smart contract, not how to do it with cleos. – Phillip Hamnett - EOS42 Sep 24 '18 at 15:42
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I have since learned that this isn't possible, and could only be done using an external oracle or other off-chain service. If this changes in the future I will update this answer.

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