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