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Heap verify signature block

the process of verifying a signature using solidity is in four steps first you have the message to sign and then you hast a message next you would sign the message this will be done off chain this will not be done inside the smart contract so this will be done off-chain using your wallet in the last step you can verify the signature inside the smart contract by calling the function ec recover passing in the hash of the message and the signature this function will return a signer and you can check that the signer that was returned from this function ec recover is actually equal to the true signer that signed the message i'm going to show you how to verify a signature inside solidity the first thing that we'll do is create a function called verify which will take in a message signature and assigner and verify that the signature is valid along the way we'll need to create some internal functions so we'll do that after we create the main function verify so let's get started i'll create the function by typing function verify it's going to take in several inputs address of the signer this will be the address that we expect ec recover to return next will be the message that we're signing for this example we'll keep it simple and we'll sign a string message so i'll say string memory message the last input will be the signature so it'll be bytes memory sig we'll make this function external appear and it will return a boolean if the signature is valid and the signer that was returned by ec recover is actually equal to the signer from the input then it will return true otherwise we'll return false so as outline in the first step the first thing that we will do is hash the message for hashing the message we will use catch up 256 and the hash returned by catch act 256 is bytes32 and we'll name this variable message hash is equal to get message hash this will be a function that we will write out later basically it will do a catch act 256 of the input the input will be the string message that we pass as an input to the function verify now when we actually sign the message off chain the message that is signed is not message hash this hash that is actually signed is also 32 and we'll name it if sign message hash is equal to get if sign message hash and then we'll pass in the message hash from step one we have not defined this function yet but we will do it later for the last step we'll take this eve signed message hash verify it with the signature this will recover the signer so we'll check that the signer that was returned is equal to the signer from the input we'll define this function later but for now we'll...