Crypto · medium

34. Signature verification

Use ecrecover to authenticate signers.

Write `verify(bytes32 hash, uint8 v, bytes32 r, bytes32 s, address expected)` returning `true` if `ecrecover(hash, v, r, s) == expected`.

Required in your answer: ecrecover(h, v, r, s)== expected

Compiles with solc in your browser

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Sig {
    function verify(bytes32 h, uint8 v, bytes32 r, bytes32 s, address expected) external pure returns (bool) {
        // TODO
    }
}

Output appears here.

← 33. Checks-Effects-Interactions 35. Merkle proof verification →