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in 2016 on etherium the DAO smart contract got stolen hundreds of millions of ether hackers use a technique called a re-entrant the attack if your smart contract developer thats very important to understand how it works so in this video Im going to explain you what is a reentrant see attack and how you can protect against it using the open sibling framework hey Im Julia and on my channel in two blocks I teach how to become a blockchain developer and get your first blockchain job first lets understand how this work so here we have two smart contract first the victim spot contract thats my contract and the attackers spot contracted is going to perform the attack so lets say that my contract holds some token on behalf of some other addresses and its possible to docHub draw this token with the residual function so you call the original function you specify the amount of token that you want to restore and then there gonna be some logic to make sure that your balance of token is enoug