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okay welcome back today you and i are going to look at re-entrancy attacks now although reentrancy seems to be well-known and kind of old it seems to be one of the most common attacks over the last few years if youre new here im calvin and on eat the blocks we help web 2 developers transition into web 3. [Music] april of 2020 25 million was taken from unit swap and land f using reentrancy may 2021 7.2 million in tokens was lost by burger swap via a reentrancy exploit august 2021 cream finance lost 18.8 million due to similar exploits and not forgetting one of the most famous the dow hack that caused a loss of 60 million us dollars now re-entry can happen when a contract function makes an external call to an untrusted contract the untrusted contract repeatedly calls the original function before its finished executing in order to drain the funds lets have a look at a simple example well have one contract under attack called bank and then well have the attacker contract called thie