Smart Contract Security - Ethernaut Challenge #16 - Preservation

Master the powerful Solidity programming language in just 17 video lessons by getting "The Solidity Deep Dive" at www.defideveloperacademy.com/the-solidity-deep-dive

[@ufo]

Why the setFirstTime function input is uint but we could input a string?

[@mattjaf]

I like learn something new in each one of these

[@tommyatkins4806]

You're a great teacher! Learning so much! I am a little confused why we are able to pass a string / address into setFirstTime(). I understand it is so we can override storage slot 0 and delegate call with our attack contract, but I am unsure why / how solidity lets us pass in anything that isn't a uint? Hopefully my question makes sense :)

[@IABV96]

Mark, I´ve got a question here. How were you able to pass the Preservation contract your address if the type of the input of the function "setFirstTime" is a uint and not an address.

[@ufo]

same question here, tried to do everything in the contract and I convert address with uint160(address(this)) but didnt go thro

[@haytwo]

as I understood, address and uint256 preserve same length on storage. 32 bytes. So, it works

[@kamalchan9756]

@@ufo you can't bcz uint256 is bytes32 which means it hase 64 digit uint160 it donsn't have 64 digit

[@MaxMohammadi]

High quality content!

[@markmaximus100]

Thank you!

[@moonboy7202]

@@markmaximus100 I love your teaching style. Is the Full Stack DApp course still available? Roughly how many hours of content does it include? Thanks, cheers!

[@markmaximus100]

@@moonboy7202 Thank you! Full Stack DApps is not available at the moment.

[@moonboy7202]

@@markmaximus100 ok cool thank you. been watching your older videos on solidity and working my way up but wow you make it very bearable and easy to follow. amazing stuff, all the best to you!

[@kamalchan9756]

ok now i get it thats why when i get Storage 0 of Preservation it doesn't give me an address but it gives me a time stamp so the delegatecall update variables not by its name but by its slot location.