Contract check.md

31 - Contract check

Checking if a call was made from an Externally Owned Account (EOA) or a contract account is typically done using extcodesize check which may be circumvented by a contract during construction when it does not have source code available. Checking if tx.origin == msg.sender is another option. Both have implications that need to be considered. (see here)

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Slide Screenshot

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Slide Text

• Contract vs EOA
• excodesize > 0
• msg.sender == tx.origin
• Pros & Cons -> Applications
• Risk Awareness -> Implications

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References

• Youtube Reference

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