pragma solidity 0.4.25;

// <ORACLIZE_API>
    // Release targetted at solc 0.4.25 to silence compiler warning/error messages, compatible down to 0.4.22
    /*
    Copyright (c) 2015-2016 Oraclize SRL
    Copyright (c) 2016 Oraclize LTD



    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:



    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.



    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
    */

    // This api is currently targeted at 0.4.22 to 0.4.25 (stable builds), please import oraclizeAPI_pre0.4.sol or oraclizeAPI_0.4 where necessary

    contract OraclizeI {
        address public cbAddress;
        function query(uint _timestamp, string _datasource, string _arg) external payable returns (bytes32 _id);
        function query_withGasLimit(uint _timestamp, string _datasource, string _arg, uint _gaslimit) external payable returns (bytes32 _id);
        function query2(uint _timestamp, string _datasource, string _arg1, string _arg2) public payable returns (bytes32 _id);
        function query2_withGasLimit(uint _timestamp, string _datasource, string _arg1, string _arg2, uint _gaslimit) external payable returns (bytes32 _id);
        function queryN(uint _timestamp, string _datasource, bytes _argN) public payable returns (bytes32 _id);
        function queryN_withGasLimit(uint _timestamp, string _datasource, bytes _argN, uint _gaslimit) external payable returns (bytes32 _id);
        function getPrice(string _datasource) public returns (uint _dsprice);
        function getPrice(string _datasource, uint gaslimit) public returns (uint _dsprice);
        function setProofType(byte _proofType) external;
        function setCustomGasPrice(uint _gasPrice) external;
        function randomDS_getSessionPubKeyHash() external constant returns(bytes32);
    }

    contract OraclizeAddrResolverI {
        function getAddress() public returns (address _addr);
    }

    /*
    Begin solidity-cborutils

    https://github.com/smartcontractkit/solidity-cborutils

    MIT License

    Copyright (c) 2018 SmartContract ChainLink, Ltd.

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
    */

    library Buffer {
        struct buffer {
            bytes buf;
            uint capacity;
        }

        function init(buffer memory buf, uint _capacity) internal pure {
            uint capacity = _capacity;
            if(capacity % 32 != 0) capacity += 32 - (capacity % 32);
            // Allocate space for the buffer data
            buf.capacity = capacity;
            assembly {
                let ptr := mload(0x40)
                mstore(buf, ptr)
                mstore(ptr, 0)
                mstore(0x40, add(ptr, capacity))
            }
        }

        function resize(buffer memory buf, uint capacity) private pure {
            bytes memory oldbuf = buf.buf;
            init(buf, capacity);
            append(buf, oldbuf);
        }

        function max(uint a, uint b) private pure returns(uint) {
            if(a > b) {
                return a;
            }
            return b;
        }

        /**
        * @dev Appends a byte array to the end of the buffer. Resizes if doing so
        *      would exceed the capacity of the buffer.
        * @param buf The buffer to append to.
        * @param data The data to append.
        * @return The original buffer.
        */
        function append(buffer memory buf, bytes data) internal pure returns(buffer memory) {
            if(data.length + buf.buf.length > buf.capacity) {
                resize(buf, max(buf.capacity, data.length) * 2);
            }

            uint dest;
            uint src;
            uint len = data.length;
            assembly {
                // Memory address of the buffer data
                let bufptr := mload(buf)
                // Length of existing buffer data
                let buflen := mload(bufptr)
                // Start address = buffer address + buffer length + sizeof(buffer length)
                dest := add(add(bufptr, buflen), 32)
                // Update buffer length
                mstore(bufptr, add(buflen, mload(data)))
                src := add(data, 32)
            }

            // Copy word-length chunks while possible
            for(; len >= 32; len -= 32) {
                assembly {
                    mstore(dest, mload(src))
                }
                dest += 32;
                src += 32;
            }

            // Copy remaining bytes
            uint mask = 256 ** (32 - len) - 1;
            assembly {
                let srcpart := and(mload(src), not(mask))
                let destpart := and(mload(dest), mask)
                mstore(dest, or(destpart, srcpart))
            }

            return buf;
        }

        /**
        * @dev Appends a byte to the end of the buffer. Resizes if doing so would
        * exceed the capacity of the buffer.
        * @param buf The buffer to append to.
        * @param data The data to append.
        * @return The original buffer.
        */
        function append(buffer memory buf, uint8 data) internal pure {
            if(buf.buf.length + 1 > buf.capacity) {
                resize(buf, buf.capacity * 2);
            }

            assembly {
                // Memory address of the buffer data
                let bufptr := mload(buf)
                // Length of existing buffer data
                let buflen := mload(bufptr)
                // Address = buffer address + buffer length + sizeof(buffer length)
                let dest := add(add(bufptr, buflen), 32)
                mstore8(dest, data)
                // Update buffer length
                mstore(bufptr, add(buflen, 1))
            }
        }

        /**
        * @dev Appends a byte to the end of the buffer. Resizes if doing so would
        * exceed the capacity of the buffer.
        * @param buf The buffer to append to.
        * @param data The data to append.
        * @return The original buffer.
        */
        function appendInt(buffer memory buf, uint data, uint len) internal pure returns(buffer memory) {
            if(len + buf.buf.length > buf.capacity) {
                resize(buf, max(buf.capacity, len) * 2);
            }

            uint mask = 256 ** len - 1;
            assembly {
                // Memory address of the buffer data
                let bufptr := mload(buf)
                // Length of existing buffer data
                let buflen := mload(bufptr)
                // Address = buffer address + buffer length + sizeof(buffer length) + len
                let dest := add(add(bufptr, buflen), len)
                mstore(dest, or(and(mload(dest), not(mask)), data))
                // Update buffer length
                mstore(bufptr, add(buflen, len))
            }
            return buf;
        }
    }

    library CBOR {
        using Buffer for Buffer.buffer;

        uint8 private constant MAJOR_TYPE_INT = 0;
        uint8 private constant MAJOR_TYPE_NEGATIVE_INT = 1;
        uint8 private constant MAJOR_TYPE_BYTES = 2;
        uint8 private constant MAJOR_TYPE_STRING = 3;
        uint8 private constant MAJOR_TYPE_ARRAY = 4;
        uint8 private constant MAJOR_TYPE_MAP = 5;
        uint8 private constant MAJOR_TYPE_CONTENT_FREE = 7;

        function encodeType(Buffer.buffer memory buf, uint8 major, uint value) private pure {
            if(value <= 23) {
                buf.append(uint8((major << 5) | value));
            } else if(value <= 0xFF) {
                buf.append(uint8((major << 5) | 24));
                buf.appendInt(value, 1);
            } else if(value <= 0xFFFF) {
                buf.append(uint8((major << 5) | 25));
                buf.appendInt(value, 2);
            } else if(value <= 0xFFFFFFFF) {
                buf.append(uint8((major << 5) | 26));
                buf.appendInt(value, 4);
            } else if(value <= 0xFFFFFFFFFFFFFFFF) {
                buf.append(uint8((major << 5) | 27));
                buf.appendInt(value, 8);
            }
        }

        function encodeIndefiniteLengthType(Buffer.buffer memory buf, uint8 major) private pure {
            buf.append(uint8((major << 5) | 31));
        }

        function encodeUInt(Buffer.buffer memory buf, uint value) internal pure {
            encodeType(buf, MAJOR_TYPE_INT, value);
        }

        function encodeInt(Buffer.buffer memory buf, int value) internal pure {
            if(value >= 0) {
                encodeType(buf, MAJOR_TYPE_INT, uint(value));
            } else {
                encodeType(buf, MAJOR_TYPE_NEGATIVE_INT, uint(-1 - value));
            }
        }

        function encodeBytes(Buffer.buffer memory buf, bytes value) internal pure {
            encodeType(buf, MAJOR_TYPE_BYTES, value.length);
            buf.append(value);
        }

        function encodeString(Buffer.buffer memory buf, string value) internal pure {
            encodeType(buf, MAJOR_TYPE_STRING, bytes(value).length);
            buf.append(bytes(value));
        }

        function startArray(Buffer.buffer memory buf) internal pure {
            encodeIndefiniteLengthType(buf, MAJOR_TYPE_ARRAY);
        }

        function startMap(Buffer.buffer memory buf) internal pure {
            encodeIndefiniteLengthType(buf, MAJOR_TYPE_MAP);
        }

        function endSequence(Buffer.buffer memory buf) internal pure {
            encodeIndefiniteLengthType(buf, MAJOR_TYPE_CONTENT_FREE);
        }
    }

    /*
    End solidity-cborutils
    */

    contract usingOraclize {
        uint constant day = 60*60*24;
        uint constant week = 60*60*24*7;
        uint constant month = 60*60*24*30;
        byte constant proofType_NONE = 0x00;
        byte constant proofType_TLSNotary = 0x10;
        byte constant proofType_Ledger = 0x30;
        byte constant proofType_Android = 0x40;
        byte constant proofType_Native = 0xF0;
        byte constant proofStorage_IPFS = 0x01;
        uint8 constant networkID_auto = 0;
        uint8 constant networkID_mainnet = 1;
        uint8 constant networkID_testnet = 2;
        uint8 constant networkID_morden = 2;
        uint8 constant networkID_consensys = 161;

        OraclizeAddrResolverI OAR;

        OraclizeI oraclize;
        modifier oraclizeAPI {
            if((address(OAR)==0)||(getCodeSize(address(OAR))==0))
                oraclize_setNetwork(networkID_auto);

            if(address(oraclize) != OAR.getAddress())
                oraclize = OraclizeI(OAR.getAddress());

            _;
        }
        modifier coupon(string code){
            oraclize = OraclizeI(OAR.getAddress());
            _;
        }

        function oraclize_setNetwork(uint8 networkID) internal returns(bool){
        return oraclize_setNetwork();
        networkID; // silence the warning and remain backwards compatible
        }
        function oraclize_setNetwork() internal returns(bool){
            if (getCodeSize(0x1d3B2638a7cC9f2CB3D298A3DA7a90B67E5506ed)>0){ //mainnet
                OAR = OraclizeAddrResolverI(0x1d3B2638a7cC9f2CB3D298A3DA7a90B67E5506ed);
                oraclize_setNetworkName("eth_mainnet");
                return true;
            }
            if (getCodeSize(0xc03A2615D5efaf5F49F60B7BB6583eaec212fdf1)>0){ //ropsten testnet
                OAR = OraclizeAddrResolverI(0xc03A2615D5efaf5F49F60B7BB6583eaec212fdf1);
                oraclize_setNetworkName("eth_ropsten3");
                return true;
            }
            if (getCodeSize(0xB7A07BcF2Ba2f2703b24C0691b5278999C59AC7e)>0){ //kovan testnet
                OAR = OraclizeAddrResolverI(0xB7A07BcF2Ba2f2703b24C0691b5278999C59AC7e);
                oraclize_setNetworkName("eth_kovan");
                return true;
            }
            if (getCodeSize(0x146500cfd35B22E4A392Fe0aDc06De1a1368Ed48)>0){ //rinkeby testnet
                OAR = OraclizeAddrResolverI(0x146500cfd35B22E4A392Fe0aDc06De1a1368Ed48);
                oraclize_setNetworkName("eth_rinkeby");
                return true;
            }
            if (getCodeSize(0x6f485C8BF6fc43eA212E93BBF8ce046C7f1cb475)>0){ //ethereum-bridge
                OAR = OraclizeAddrResolverI(0x6f485C8BF6fc43eA212E93BBF8ce046C7f1cb475);
                return true;
            }
            if (getCodeSize(0x20e12A1F859B3FeaE5Fb2A0A32C18F5a65555bBF)>0){ //ether.camp ide
                OAR = OraclizeAddrResolverI(0x20e12A1F859B3FeaE5Fb2A0A32C18F5a65555bBF);
                return true;
            }
            if (getCodeSize(0x51efaF4c8B3C9AfBD5aB9F4bbC82784Ab6ef8fAA)>0){ //browser-solidity
                OAR = OraclizeAddrResolverI(0x51efaF4c8B3C9AfBD5aB9F4bbC82784Ab6ef8fAA);
                return true;
            }
            return false;
        }

        function __callback(bytes32 myid, string result) public {
            __callback(myid, result, new bytes(0));
        }
        function __callback(bytes32 myid, string result, bytes proof) public {
        return;
        // Following should never be reached with a preceding return, however
        // this is just a placeholder function, ideally meant to be defined in
        // child contract when proofs are used
        myid; result; proof; // Silence compiler warnings
        oraclize = OraclizeI(0); // Additional compiler silence about making function pure/view. 
        }

        function oraclize_getPrice(string datasource) oraclizeAPI internal returns (uint){
            return oraclize.getPrice(datasource);
        }

        function oraclize_getPrice(string datasource, uint gaslimit) oraclizeAPI internal returns (uint){
            return oraclize.getPrice(datasource, gaslimit);
        }

        function oraclize_query(string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            return oraclize.query.value(price)(0, datasource, arg);
        }
        function oraclize_query(uint timestamp, string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            return oraclize.query.value(price)(timestamp, datasource, arg);
        }
        function oraclize_query(uint timestamp, string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            return oraclize.query_withGasLimit.value(price)(timestamp, datasource, arg, gaslimit);
        }
        function oraclize_query(string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            return oraclize.query_withGasLimit.value(price)(0, datasource, arg, gaslimit);
        }
        function oraclize_query(string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            return oraclize.query2.value(price)(0, datasource, arg1, arg2);
        }
        function oraclize_query(uint timestamp, string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            return oraclize.query2.value(price)(timestamp, datasource, arg1, arg2);
        }
        function oraclize_query(uint timestamp, string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            return oraclize.query2_withGasLimit.value(price)(timestamp, datasource, arg1, arg2, gaslimit);
        }
        function oraclize_query(string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            return oraclize.query2_withGasLimit.value(price)(0, datasource, arg1, arg2, gaslimit);
        }
        function oraclize_query(string datasource, string[] argN) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            bytes memory args = stra2cbor(argN);
            return oraclize.queryN.value(price)(0, datasource, args);
        }
        function oraclize_query(uint timestamp, string datasource, string[] argN) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            bytes memory args = stra2cbor(argN);
            return oraclize.queryN.value(price)(timestamp, datasource, args);
        }
        function oraclize_query(uint timestamp, string datasource, string[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            bytes memory args = stra2cbor(argN);
            return oraclize.queryN_withGasLimit.value(price)(timestamp, datasource, args, gaslimit);
        }
        function oraclize_query(string datasource, string[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            bytes memory args = stra2cbor(argN);
            return oraclize.queryN_withGasLimit.value(price)(0, datasource, args, gaslimit);
        }
        function oraclize_query(string datasource, string[1] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](1);
            dynargs[0] = args[0];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[1] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](1);
            dynargs[0] = args[0];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](1);
            dynargs[0] = args[0];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](1);
            dynargs[0] = args[0];
            return oraclize_query(datasource, dynargs, gaslimit);
        }

        function oraclize_query(string datasource, string[2] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[2] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[3] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[3] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(datasource, dynargs, gaslimit);
        }

        function oraclize_query(string datasource, string[4] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[4] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[5] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[5] args) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, string[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, string[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            string[] memory dynargs = new string[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[] argN) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            bytes memory args = ba2cbor(argN);
            return oraclize.queryN.value(price)(0, datasource, args);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[] argN) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource);
            if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
            bytes memory args = ba2cbor(argN);
            return oraclize.queryN.value(price)(timestamp, datasource, args);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            bytes memory args = ba2cbor(argN);
            return oraclize.queryN_withGasLimit.value(price)(timestamp, datasource, args, gaslimit);
        }
        function oraclize_query(string datasource, bytes[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
            uint price = oraclize.getPrice(datasource, gaslimit);
            if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
            bytes memory args = ba2cbor(argN);
            return oraclize.queryN_withGasLimit.value(price)(0, datasource, args, gaslimit);
        }
        function oraclize_query(string datasource, bytes[1] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](1);
            dynargs[0] = args[0];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[1] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](1);
            dynargs[0] = args[0];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](1);
            dynargs[0] = args[0];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](1);
            dynargs[0] = args[0];
            return oraclize_query(datasource, dynargs, gaslimit);
        }

        function oraclize_query(string datasource, bytes[2] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[2] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](2);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            return oraclize_query(datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[3] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[3] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](3);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            return oraclize_query(datasource, dynargs, gaslimit);
        }

        function oraclize_query(string datasource, bytes[4] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[4] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](4);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            return oraclize_query(datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[5] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[5] args) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(timestamp, datasource, dynargs);
        }
        function oraclize_query(uint timestamp, string datasource, bytes[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(timestamp, datasource, dynargs, gaslimit);
        }
        function oraclize_query(string datasource, bytes[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
            bytes[] memory dynargs = new bytes[](5);
            dynargs[0] = args[0];
            dynargs[1] = args[1];
            dynargs[2] = args[2];
            dynargs[3] = args[3];
            dynargs[4] = args[4];
            return oraclize_query(datasource, dynargs, gaslimit);
        }

        function oraclize_cbAddress() oraclizeAPI internal returns (address){
            return oraclize.cbAddress();
        }
        function oraclize_setProof(byte proofP) oraclizeAPI internal {
            return oraclize.setProofType(proofP);
        }
        function oraclize_setCustomGasPrice(uint gasPrice) oraclizeAPI internal {
            return oraclize.setCustomGasPrice(gasPrice);
        }

        function oraclize_randomDS_getSessionPubKeyHash() oraclizeAPI internal returns (bytes32){
            return oraclize.randomDS_getSessionPubKeyHash();
        }

        function getCodeSize(address _addr) view internal returns(uint _size) {
            assembly {
                _size := extcodesize(_addr)
            }
        }

        function parseAddr(string _a) internal pure returns (address){
            bytes memory tmp = bytes(_a);
            uint160 iaddr = 0;
            uint160 b1;
            uint160 b2;
            for (uint i=2; i<2+2*20; i+=2){
                iaddr *= 256;
                b1 = uint160(tmp[i]);
                b2 = uint160(tmp[i+1]);
                if ((b1 >= 97)&&(b1 <= 102)) b1 -= 87;
                else if ((b1 >= 65)&&(b1 <= 70)) b1 -= 55;
                else if ((b1 >= 48)&&(b1 <= 57)) b1 -= 48;
                if ((b2 >= 97)&&(b2 <= 102)) b2 -= 87;
                else if ((b2 >= 65)&&(b2 <= 70)) b2 -= 55;
                else if ((b2 >= 48)&&(b2 <= 57)) b2 -= 48;
                iaddr += (b1*16+b2);
            }
            return address(iaddr);
        }

        function strCompare(string _a, string _b) internal pure returns (int) {
            bytes memory a = bytes(_a);
            bytes memory b = bytes(_b);
            uint minLength = a.length;
            if (b.length < minLength) minLength = b.length;
            for (uint i = 0; i < minLength; i ++)
                if (a[i] < b[i])
                    return -1;
                else if (a[i] > b[i])
                    return 1;
            if (a.length < b.length)
                return -1;
            else if (a.length > b.length)
                return 1;
            else
                return 0;
        }

        function indexOf(string _haystack, string _needle) internal pure returns (int) {
            bytes memory h = bytes(_haystack);
            bytes memory n = bytes(_needle);
            if(h.length < 1 || n.length < 1 || (n.length > h.length))
                return -1;
            else if(h.length > (2**128 -1))
                return -1;
            else
            {
                uint subindex = 0;
                for (uint i = 0; i < h.length; i ++)
                {
                    if (h[i] == n[0])
                    {
                        subindex = 1;
                        while(subindex < n.length && (i + subindex) < h.length && h[i + subindex] == n[subindex])
                        {
                            subindex++;
                        }
                        if(subindex == n.length)
                            return int(i);
                    }
                }
                return -1;
            }
        }

        function strConcat(string _a, string _b, string _c, string _d, string _e) internal pure returns (string) {
            bytes memory _ba = bytes(_a);
            bytes memory _bb = bytes(_b);
            bytes memory _bc = bytes(_c);
            bytes memory _bd = bytes(_d);
            bytes memory _be = bytes(_e);
            string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
            bytes memory babcde = bytes(abcde);
            uint k = 0;
            for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
            for (i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
            for (i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
            for (i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
            for (i = 0; i < _be.length; i++) babcde[k++] = _be[i];
            return string(babcde);
        }

        function strConcat(string _a, string _b, string _c, string _d) internal pure returns (string) {
            return strConcat(_a, _b, _c, _d, "");
        }

        function strConcat(string _a, string _b, string _c) internal pure returns (string) {
            return strConcat(_a, _b, _c, "", "");
        }

        function strConcat(string _a, string _b) internal pure returns (string) {
            return strConcat(_a, _b, "", "", "");
        }

        // parseInt
        function parseInt(string _a) internal pure returns (uint) {
            return parseInt(_a, 0);
        }

        // parseInt(parseFloat*10^_b)
        function parseInt(string _a, uint _b) internal pure returns (uint) {
            bytes memory bresult = bytes(_a);
            uint mint = 0;
            bool decimals = false;
            for (uint i=0; i<bresult.length; i++){
                if ((bresult[i] >= 48)&&(bresult[i] <= 57)){
                    if (decimals){
                    if (_b == 0) break;
                        else _b--;
                    }
                    mint *= 10;
                    mint += uint(bresult[i]) - 48;
                } else if (bresult[i] == 46) decimals = true;
            }
            if (_b > 0) mint *= 10**_b;
            return mint;
        }

        function uint2str(uint i) internal pure returns (string){
            if (i == 0) return "0";
            uint j = i;
            uint len;
            while (j != 0){
                len++;
                j /= 10;
            }
            bytes memory bstr = new bytes(len);
            uint k = len - 1;
            while (i != 0){
                bstr[k--] = byte(48 + i % 10);
                i /= 10;
            }
            return string(bstr);
        }

        using CBOR for Buffer.buffer;
        function stra2cbor(string[] arr) internal pure returns (bytes) {
            safeMemoryCleaner();
            Buffer.buffer memory buf;
            Buffer.init(buf, 1024);
            buf.startArray();
            for (uint i = 0; i < arr.length; i++) {
                buf.encodeString(arr[i]);
            }
            buf.endSequence();
            return buf.buf;
        }

        function ba2cbor(bytes[] arr) internal pure returns (bytes) {
            safeMemoryCleaner();
            Buffer.buffer memory buf;
            Buffer.init(buf, 1024);
            buf.startArray();
            for (uint i = 0; i < arr.length; i++) {
                buf.encodeBytes(arr[i]);
            }
            buf.endSequence();
            return buf.buf;
        }

        string oraclize_network_name;
        function oraclize_setNetworkName(string _network_name) internal {
            oraclize_network_name = _network_name;
        }

        function oraclize_getNetworkName() internal view returns (string) {
            return oraclize_network_name;
        }

        function oraclize_newRandomDSQuery(uint _delay, uint _nbytes, uint _customGasLimit) internal returns (bytes32){
            require((_nbytes > 0) && (_nbytes <= 32));
            // Convert from seconds to ledger timer ticks
            _delay *= 10;
            bytes memory nbytes = new bytes(1);
            nbytes[0] = byte(_nbytes);
            bytes memory unonce = new bytes(32);
            bytes memory sessionKeyHash = new bytes(32);
            bytes32 sessionKeyHash_bytes32 = oraclize_randomDS_getSessionPubKeyHash();
            assembly {
                mstore(unonce, 0x20)
                // the following variables can be relaxed
                // check relaxed random contract under ethereum-examples repo
                // for an idea on how to override and replace comit hash vars
                mstore(add(unonce, 0x20), xor(blockhash(sub(number, 1)), xor(coinbase, timestamp)))
                mstore(sessionKeyHash, 0x20)
                mstore(add(sessionKeyHash, 0x20), sessionKeyHash_bytes32)
            }
            bytes memory delay = new bytes(32);
            assembly {
                mstore(add(delay, 0x20), _delay)
            }

            bytes memory delay_bytes8 = new bytes(8);
            copyBytes(delay, 24, 8, delay_bytes8, 0);

            bytes[4] memory args = [unonce, nbytes, sessionKeyHash, delay];
            bytes32 queryId = oraclize_query("random", args, _customGasLimit);

            bytes memory delay_bytes8_left = new bytes(8);

            assembly {
                let x := mload(add(delay_bytes8, 0x20))
                mstore8(add(delay_bytes8_left, 0x27), div(x, 0x100000000000000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x26), div(x, 0x1000000000000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x25), div(x, 0x10000000000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x24), div(x, 0x100000000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x23), div(x, 0x1000000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x22), div(x, 0x10000000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x21), div(x, 0x100000000000000000000000000000000000000000000000000))
                mstore8(add(delay_bytes8_left, 0x20), div(x, 0x1000000000000000000000000000000000000000000000000))

            }

            oraclize_randomDS_setCommitment(queryId, keccak256(abi.encodePacked(delay_bytes8_left, args[1], sha256(args[0]), args[2])));
            return queryId;
        }

        function oraclize_randomDS_setCommitment(bytes32 queryId, bytes32 commitment) internal {
            oraclize_randomDS_args[queryId] = commitment;
        }

        mapping(bytes32=>bytes32) oraclize_randomDS_args;
        mapping(bytes32=>bool) oraclize_randomDS_sessionKeysHashVerified;

        function verifySig(bytes32 tosignh, bytes dersig, bytes pubkey) internal returns (bool){
            bool sigok;
            address signer;

            bytes32 sigr;
            bytes32 sigs;

            bytes memory sigr_ = new bytes(32);
            uint offset = 4+(uint(dersig[3]) - 0x20);
            sigr_ = copyBytes(dersig, offset, 32, sigr_, 0);
            bytes memory sigs_ = new bytes(32);
            offset += 32 + 2;
            sigs_ = copyBytes(dersig, offset+(uint(dersig[offset-1]) - 0x20), 32, sigs_, 0);

            assembly {
                sigr := mload(add(sigr_, 32))
                sigs := mload(add(sigs_, 32))
            }


            (sigok, signer) = safer_ecrecover(tosignh, 27, sigr, sigs);
            if (address(keccak256(pubkey)) == signer) return true;
            else {
                (sigok, signer) = safer_ecrecover(tosignh, 28, sigr, sigs);
                return (address(keccak256(pubkey)) == signer);
            }
        }

        function oraclize_randomDS_proofVerify__sessionKeyValidity(bytes proof, uint sig2offset) internal returns (bool) {
            bool sigok;

            // Step 6: verify the attestation signature, APPKEY1 must sign the sessionKey from the correct ledger app (CODEHASH)
            bytes memory sig2 = new bytes(uint(proof[sig2offset+1])+2);
            copyBytes(proof, sig2offset, sig2.length, sig2, 0);

            bytes memory appkey1_pubkey = new bytes(64);
            copyBytes(proof, 3+1, 64, appkey1_pubkey, 0);

            bytes memory tosign2 = new bytes(1+65+32);
            tosign2[0] = byte(1); //role
            copyBytes(proof, sig2offset-65, 65, tosign2, 1);
            bytes memory CODEHASH = hex"fd94fa71bc0ba10d39d464d0d8f465efeef0a2764e3887fcc9df41ded20f505c";
            copyBytes(CODEHASH, 0, 32, tosign2, 1+65);
            sigok = verifySig(sha256(tosign2), sig2, appkey1_pubkey);

            if (sigok == false) return false;


            // Step 7: verify the APPKEY1 provenance (must be signed by Ledger)
            bytes memory LEDGERKEY = hex"7fb956469c5c9b89840d55b43537e66a98dd4811ea0a27224272c2e5622911e8537a2f8e86a46baec82864e98dd01e9ccc2f8bc5dfc9cbe5a91a290498dd96e4";

            bytes memory tosign3 = new bytes(1+65);
            tosign3[0] = 0xFE;
            copyBytes(proof, 3, 65, tosign3, 1);

            bytes memory sig3 = new bytes(uint(proof[3+65+1])+2);
            copyBytes(proof, 3+65, sig3.length, sig3, 0);

            sigok = verifySig(sha256(tosign3), sig3, LEDGERKEY);

            return sigok;
        }

        modifier oraclize_randomDS_proofVerify(bytes32 _queryId, string _result, bytes _proof) {
            // Step 1: the prefix has to match 'LP\x01' (Ledger Proof version 1)
            require((_proof[0] == "L") && (_proof[1] == "P") && (_proof[2] == 1));

            bool proofVerified = oraclize_randomDS_proofVerify__main(_proof, _queryId, bytes(_result), oraclize_getNetworkName());
            require(proofVerified);

            _;
        }

        function oraclize_randomDS_proofVerify__returnCode(bytes32 _queryId, string _result, bytes _proof) internal returns (uint8){
            // Step 1: the prefix has to match 'LP\x01' (Ledger Proof version 1)
            if ((_proof[0] != "L")||(_proof[1] != "P")||(_proof[2] != 1)) return 1;

            bool proofVerified = oraclize_randomDS_proofVerify__main(_proof, _queryId, bytes(_result), oraclize_getNetworkName());
            if (proofVerified == false) return 2;

            return 0;
        }

        function matchBytes32Prefix(bytes32 content, bytes prefix, uint n_random_bytes) internal pure returns (bool){
            bool match_ = true;

            require(prefix.length == n_random_bytes);

            for (uint256 i=0; i< n_random_bytes; i++) {
                if (content[i] != prefix[i]) match_ = false;
            }

            return match_;
        }

        function oraclize_randomDS_proofVerify__main(bytes proof, bytes32 queryId, bytes result, string context_name) internal returns (bool){

            // Step 2: the unique keyhash has to match with the sha256 of (context name + queryId)
            uint ledgerProofLength = 3+65+(uint(proof[3+65+1])+2)+32;
            bytes memory keyhash = new bytes(32);
            copyBytes(proof, ledgerProofLength, 32, keyhash, 0);
            if (!(keccak256(keyhash) == keccak256(abi.encodePacked(sha256(abi.encodePacked(context_name, queryId)))))) return false;

            bytes memory sig1 = new bytes(uint(proof[ledgerProofLength+(32+8+1+32)+1])+2);
            copyBytes(proof, ledgerProofLength+(32+8+1+32), sig1.length, sig1, 0);

            // Step 3: we assume sig1 is valid (it will be verified during step 5) and we verify if 'result' is the prefix of sha256(sig1)
            if (!matchBytes32Prefix(sha256(sig1), result, uint(proof[ledgerProofLength+32+8]))) return false;

            // Step 4: commitment match verification, keccak256(delay, nbytes, unonce, sessionKeyHash) == commitment in storage.
            // This is to verify that the computed args match with the ones specified in the query.
            bytes memory commitmentSlice1 = new bytes(8+1+32);
            copyBytes(proof, ledgerProofLength+32, 8+1+32, commitmentSlice1, 0);

            bytes memory sessionPubkey = new bytes(64);
            uint sig2offset = ledgerProofLength+32+(8+1+32)+sig1.length+65;
            copyBytes(proof, sig2offset-64, 64, sessionPubkey, 0);

            bytes32 sessionPubkeyHash = sha256(sessionPubkey);
            if (oraclize_randomDS_args[queryId] == keccak256(abi.encodePacked(commitmentSlice1, sessionPubkeyHash))){ //unonce, nbytes and sessionKeyHash match
                delete oraclize_randomDS_args[queryId];
            } else return false;


            // Step 5: validity verification for sig1 (keyhash and args signed with the sessionKey)
            bytes memory tosign1 = new bytes(32+8+1+32);
            copyBytes(proof, ledgerProofLength, 32+8+1+32, tosign1, 0);
            if (!verifySig(sha256(tosign1), sig1, sessionPubkey)) return false;

            // verify if sessionPubkeyHash was verified already, if not.. let's do it!
            if (oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash] == false){
                oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash] = oraclize_randomDS_proofVerify__sessionKeyValidity(proof, sig2offset);
            }

            return oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash];
        }

        // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
        function copyBytes(bytes from, uint fromOffset, uint length, bytes to, uint toOffset) internal pure returns (bytes) {
            uint minLength = length + toOffset;

            // Buffer too small
            require(to.length >= minLength); // Should be a better way?

            // NOTE: the offset 32 is added to skip the `size` field of both bytes variables
            uint i = 32 + fromOffset;
            uint j = 32 + toOffset;

            while (i < (32 + fromOffset + length)) {
                assembly {
                    let tmp := mload(add(from, i))
                    mstore(add(to, j), tmp)
                }
                i += 32;
                j += 32;
            }

            return to;
        }

        // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
        // Duplicate Solidity's ecrecover, but catching the CALL return value
        function safer_ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal returns (bool, address) {
            // We do our own memory management here. Solidity uses memory offset
            // 0x40 to store the current end of memory. We write past it (as
            // writes are memory extensions), but don't update the offset so
            // Solidity will reuse it. The memory used here is only needed for
            // this context.

            // FIXME: inline assembly can't access return values
            bool ret;
            address addr;

            assembly {
                let size := mload(0x40)
                mstore(size, hash)
                mstore(add(size, 32), v)
                mstore(add(size, 64), r)
                mstore(add(size, 96), s)

                // NOTE: we can reuse the request memory because we deal with
                //       the return code
                ret := call(3000, 1, 0, size, 128, size, 32)
                addr := mload(size)
            }

            return (ret, addr);
        }

        // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
        function ecrecovery(bytes32 hash, bytes sig) internal returns (bool, address) {
            bytes32 r;
            bytes32 s;
            uint8 v;

            if (sig.length != 65)
            return (false, 0);

            // The signature format is a compact form of:
            //   {bytes32 r}{bytes32 s}{uint8 v}
            // Compact means, uint8 is not padded to 32 bytes.
            assembly {
                r := mload(add(sig, 32))
                s := mload(add(sig, 64))

                // Here we are loading the last 32 bytes. We exploit the fact that
                // 'mload' will pad with zeroes if we overread.
                // There is no 'mload8' to do this, but that would be nicer.
                v := byte(0, mload(add(sig, 96)))

                // Alternative solution:
                // 'byte' is not working due to the Solidity parser, so lets
                // use the second best option, 'and'
                // v := and(mload(add(sig, 65)), 255)
            }

            // albeit non-transactional signatures are not specified by the YP, one would expect it
            // to match the YP range of [27, 28]
            //
            // geth uses [0, 1] and some clients have followed. This might change, see:
            //  https://github.com/ethereum/go-ethereum/issues/2053
            if (v < 27)
            v += 27;

            if (v != 27 && v != 28)
                return (false, 0);

            return safer_ecrecover(hash, v, r, s);
        }

        function safeMemoryCleaner() internal pure {
            assembly {
                let fmem := mload(0x40)
                codecopy(fmem, codesize, sub(msize, fmem))
            }
        }

    }
// </ORACLIZE_API>

contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() internal {
        _owner = msg.sender;

        emit OwnershipTransferred(address(0), _owner);
    }

    function owner() public view returns(address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(isOwner(), "Access denied");
        _;
    }

    function isOwner() public view returns(bool) {
        return msg.sender == _owner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));

        _owner = address(0);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Zero address");

        emit OwnershipTransferred(_owner, newOwner);

        _owner = newOwner;
    }
}

contract TossCoin is Ownable, usingOraclize {
    struct Game {
        address addr;
        uint bet;
        bool option;
    }

    uint public min_bet = 0.05 ether;
    uint public max_bet = 2 ether;
    uint public rate = 195;
    address public ethergames;

    mapping(bytes32 => Game) public games;
    mapping(address => address) public refferals;

    event NewGame(bytes32 indexed id);
    event FinishGame(bytes32 indexed id, address indexed addr, uint bet, bool option, bool result, uint win);
    event Withdraw(address indexed to, uint value);
    
    constructor() payable public {}

    function() payable external {}
    
    function __callback(bytes32 id, string res) public {
        require(msg.sender == oraclize_cbAddress(), "Permission denied");
        require(games[id].bet > 0, "Game not found");

        bool result = parseInt(res) == 1;
        uint win = games[id].option == result ? winSize(games[id].bet) : 0;

        emit FinishGame(id, games[id].addr, games[id].bet, games[id].option, result, win);

        if(win > 0) {
            games[id].addr.transfer(win);

            if(refferals[games[id].addr] != address(0)) {
                refferals[games[id].addr].transfer(win / 100);
            }
        }

        if(ethergames != address(0)) {
            ethergames.call.value(games[id].bet / 100).gas(45000)();
        }

        delete games[id];
    }

    function winSize(uint bet) view public returns(uint) {
        return bet * rate / 100;
    }
    
    function play(bool option, address refferal) payable external {
        require(msg.value >= min_bet && msg.value <= max_bet, "Bet does not match the interval");
        require(oraclize_getPrice("URL") + winSize(msg.value) <= address(this).balance, "Insufficient funds");
        
        bytes32 id = oraclize_query("WolframAlpha", "RandomInteger[{0, 1}]");

        games[id] = Game({
            addr: msg.sender,
            bet: msg.value,
            option: option
        });

        if(refferal != address(0) && refferals[msg.sender] == address(0)) {
            refferals[msg.sender] = refferal;
        }

        emit NewGame(id);
    }
    
    function play(bool option) payable external {
        this.play(option, address(0));
    }

    function withdraw(address to, uint value) onlyOwner external {
        require(to != address(0), "Zero address");
        require(address(this).balance >= value, "Insufficient funds");

        to.transfer(value);

        emit Withdraw(to, value);
    }

    function setRate(uint value) onlyOwner external {
        rate = value;
    }

    function setMinBet(uint value) onlyOwner external {
        min_bet = value;
    }

    function setMaxBet(uint value) onlyOwner external {
        max_bet = value;
    }

    function setEtherGames(address value) onlyOwner external {
        if(ethergames == address(0)) {
            ethergames = value;
        }
    }
}