Contracts deployed on the blockchain are bytecode, difficult for us to read. On etherscan.io, you can verify that a source code compiles to the bytecode that was deploy. So you can review the code. However there is a way to have a code verified on etherscan.io and hide a malicious code. In this video I will show you how #Solidity #hidingMaliciousCode #hack #txorigin Code: https://solidity-by-example.org/hacks/hiding-malicious-code-with-external-contract/ References https://github.com/ethereumbook/ethereumbook/blob/develop/09smart-contracts-security.asciidoc https://solidity-05.ethernaut.openzeppelin.com/ Remix IDE: http://remix.ethereum.org Solidity: https://solidity.readthedocs.io Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart Join me on Discord: https://discord.gg/Ny8sPaj Website: https://smartcontractprogrammer.com ... https://www.youtube.com/watch?v=qDYlauM00lY

There are two common algorithms used to remove an element from an array in Solidity. One way is to copy all elements from right to left starting at the index to remove and then popping the last element. #Solidity #SmartContract #Ethereum #スマートコントラクト Remix https://remix.ethereum.org Code https://solidity-by-example.org/array/ Take a course https://www.smartcontract.engineer/ Follow https://twitter.com/ProgrammerSmart https://discord.gg/bt8FK2wkcW https://t.me/smartcontractprogrammer https://smartcontractprogrammer.com ... https://www.youtube.com/watch?v=szv2zJcy_Xs