Y12 Reality Key 1

yrk1.sol

// Ethereum以太坊智能合約環境說明 https://gist.github.com/y12studio/f142cd9789c7d396d8f7
contract YRealityKey {
    uint public realityId;
    bytes32 public factHash;
    address public factAddress;
    uint public baseUnit;
    uint public rkResult;

    function YRealityKey() {
        
    }
    // YES/NO 1 Bitcoin to be at least 200 US Dollar on March 4, 2016  https://www.realitykeys.com/exchange/7508
    // reality_id 7508
    // fact_hash 0xa1c7a300e9b2122b2fb3307a95d32c6a291c33bbb48d01f3a6a6e1f7da4d32e1
    // ethereum_address 0x6fde387af081c37d9ffa762b49d340e6ae213395
    // base_unit 1
    function setupRealityKey(uint reality_id, bytes32 fact_hash,address ethereum_address, uint base_unit){
        realityId = reality_id;
        factHash = fact_hash;
        factAddress = ethereum_address;
        baseUnit = base_unit;
        rkResult = 0;
    }
    // https://www.realitykeys.com/exchange/7508
    // sig_r: 0x7f4a360ea834b3c7c67fc026bddade144ba319d47fb50e706f7982b5984ba7a5
    // sig_s: 0xea694b3e853518e2d02d5ac8bb718df299ea9361783ffc118f979bfa67c7cbe3
    // sig_v: 27
    // signed_value: 0x0000000000000000000000000000000000000000000000000000000000000001
    function checkRealityKey(uint8 sig_v, bytes32 sig_r, bytes32 sig_s, bytes32 signed_value) returns (bool){
        bytes32 result_hash = sha3(factHash, signed_value);
        address signer_address = ecrecover(result_hash, sig_v, sig_r, sig_s);
        if (signer_address != factAddress) {
            return false;
        }
        // result true/false=1/0
        rkResult = uint256(signed_value) / baseUnit;
        return true;
    } 

    function () {
        throw;
    }
}