piechottkabau - Bad Salzuflen

string public address = 0x123456789abcdef1234567890abcdef1234567890abcdef1234567890abcdef;

// The checksum is appended to the address
uint256 checksum = keccak256(bytes(address));

// Now you can use the checksum to verify the address
function isValidAddress() public view returns (bool) {
uint256 storedChecksum = keccak256(bytes(address));
return storedChecksum == checksum;
}
}

In this example, the `keccak256` function is used to calculate the checksum for the `address` variable. The resulting checksum is stored in the `checksum` variable. The `isValidAddress` function uses the `keccak256` function to calculate the checksum for the stored `address` variable and compares it with the stored checksum to verify its integrity.

I hope this explanation helps