contract C {
    function f() public returns (address) {
        return recover(
            0x77e5189111eb6557e8a637b27ef8fbb15bc61d61c2f00cc48878f3a296e5e0ca,
            0, // invalid v value
            0x6944c77849b18048f6abe0db8084b0d0d0689cdddb53d2671c36967b58691ad4,
            0xef4f06ba4f78319baafd0424365777241af4dfd3da840471b4b4b087b7750d0d,
            0x000000000000000000000000ca35b7d915458ef540ade6068dfe2f44e8fa733c,
            0x000000000000000000000000ca35b7d915458ef540ade6068dfe2f44e8fa733c
        );
    }
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s, uint blockExpired, bytes32 salt)
        public returns (address)
    {
        require(hash == keccak256(abi.encodePacked(blockExpired, salt)));
        return ecrecover(hash, v, r, s);
    }
}
// ====
// ----
// f() -> 0