diff --git a/dist/ethereum.js b/dist/ethereum.js
index 1dbb42d89..12f64990f 100644
--- a/dist/ethereum.js
+++ b/dist/ethereum.js
@@ -331,15 +331,37 @@ var fromAbiOutput = function (json, methodName, output) {
     return result;
 };
 
+/// @returns display name for method eg. multiply(uint256) -> multiply
+var methodDisplayName = function (method) {
+    var length = method.indexOf('('); 
+    return length !== -1 ? method.substr(0, length) : method;
+};
+
+/// @returns overloaded part of method's name
+var methodTypeName = function (method) {
+    /// TODO: make it not vulnerable
+    var length = method.indexOf('(');
+    return length !== -1 ? method.substr(length + 1, method.length - 1 - (length + 1)) : "";
+};
+
 /// @param json abi for contract
 /// @returns input parser object for given json abi
 var inputParser = function (json) {
     var parser = {};
     json.forEach(function (method) {
-        parser[method.name] = function () {
+        var displayName = methodDisplayName(method.name); 
+        var typeName = methodTypeName(method.name);
+
+        var impl = function () {
             var params = Array.prototype.slice.call(arguments);
             return toAbiInput(json, method.name, params);
         };
+       
+        if (parser[displayName] === undefined) {
+            parser[displayName] = impl;
+        }
+
+        parser[displayName][typeName] = impl;
     });
 
     return parser;
@@ -350,9 +372,19 @@ var inputParser = function (json) {
 var outputParser = function (json) {
     var parser = {};
     json.forEach(function (method) {
-        parser[method.name] = function (output) {
+
+        var displayName = methodDisplayName(method.name); 
+        var typeName = methodTypeName(method.name);
+
+        var impl = function (output) {
             return fromAbiOutput(json, method.name, output);
         };
+
+        if (parser[displayName] === undefined) {
+            parser[displayName] = impl;
+        }
+
+        parser[displayName][typeName] = impl;
     });
 
     return parser;
@@ -362,21 +394,15 @@ var outputParser = function (json) {
 /// @param method name for which we want to get method signature
 /// @returns (promise) contract method signature for method with given name
 var methodSignature = function (json, name) {
-    var method = json[findMethodIndex(json, name)];
-    var result = name + '(';
-    var inputTypes = method.inputs.map(function (inp) {
-        return inp.type;
-    });
-    result += inputTypes.join(',');
-    result += ')';
-
-    return web3.sha3(web3.fromAscii(result));
+    return web3.sha3(web3.fromAscii(name));
 };
 
 module.exports = {
     inputParser: inputParser,
     outputParser: outputParser,
-    methodSignature: methodSignature
+    methodSignature: methodSignature,
+    methodDisplayName: methodDisplayName,
+    methodTypeName: methodTypeName
 };
 
 
@@ -552,12 +578,16 @@ var contract = function (address, desc) {
     var contract = {};
 
     desc.forEach(function (method) {
-        contract[method.name] = function () {
+
+        var displayName = abi.methodDisplayName(method.name);
+        var typeName = abi.methodTypeName(method.name);
+
+        var impl = function () {
             var params = Array.prototype.slice.call(arguments);
-            var parsed = inputParser[method.name].apply(null, params);
+            var parsed = inputParser[displayName][typeName].apply(null, params);
 
             var onSuccess = function (result) {
-                return outputParser[method.name](result);
+                return outputParser[displayName][typeName](result);
             };
 
             return {
@@ -579,6 +609,12 @@ var contract = function (address, desc) {
                 }
             };
         };
+
+        if (contract[displayName] === undefined) {
+            contract[displayName] = impl;
+        }
+
+        contract[displayName][typeName] = impl;
     });
 
     return contract;
diff --git a/dist/ethereum.js.map b/dist/ethereum.js.map
index c850654d7..747e52f56 100644
--- a/dist/ethereum.js.map
+++ b/dist/ethereum.js.map
@@ -14,14 +14,14 @@
     "index.js"
   ],
   "names": [],
-  "mappings": 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+  "mappings": 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   "file": "generated.js",
   "sourceRoot": "",
   "sourcesContent": [
     "(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})",
-    "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file abi.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n *   Gav Wood <g@ethdev.com>\n * @date 2014\n */\n\n// TODO: is these line is supposed to be here? \nif (\"build\" !== 'build') {/*\n    var BigNumber = require('bignumber.js'); // jshint ignore:line\n*/}\n\nvar web3 = require('./web3'); // jshint ignore:line\n\nBigNumber.config({ ROUNDING_MODE: BigNumber.ROUND_DOWN });\n\nvar ETH_PADDING = 32;\n\n/// Finds first index of array element matching pattern\n/// @param array\n/// @param callback pattern\n/// @returns index of element\nvar findIndex = function (array, callback) {\n    var end = false;\n    var i = 0;\n    for (; i < array.length && !end; i++) {\n        end = callback(array[i]);\n    }\n    return end ? i - 1 : -1;\n};\n\n/// @returns a function that is used as a pattern for 'findIndex'\nvar findMethodIndex = function (json, methodName) {\n    return findIndex(json, function (method) {\n        return method.name === methodName;\n    });\n};\n\n/// @param string string to be padded\n/// @param number of characters that result string should have\n/// @param sign, by default 0\n/// @returns right aligned string\nvar padLeft = function (string, chars, sign) {\n    return new Array(chars - string.length + 1).join(sign ? sign : \"0\") + string;\n};\n\n/// @param expected type prefix (string)\n/// @returns function which checks if type has matching prefix. if yes, returns true, otherwise false\nvar prefixedType = function (prefix) {\n    return function (type) {\n        return type.indexOf(prefix) === 0;\n    };\n};\n\n/// @param expected type name (string)\n/// @returns function which checks if type is matching expected one. if yes, returns true, otherwise false\nvar namedType = function (name) {\n    return function (type) {\n        return name === type;\n    };\n};\n\nvar arrayType = function (type) {\n    return type.slice(-2) === '[]';\n};\n\n/// Formats input value to byte representation of int\n/// If value is negative, return it's two's complement\n/// If the value is floating point, round it down\n/// @returns right-aligned byte representation of int\nvar formatInputInt = function (value) {\n    var padding = ETH_PADDING * 2;\n    if (value instanceof BigNumber || typeof value === 'number') {\n        if (typeof value === 'number')\n            value = new BigNumber(value);\n        value = value.round();\n\n        if (value.lessThan(0)) \n            value = new BigNumber(\"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\", 16).plus(value).plus(1);\n        value = value.toString(16);\n    }\n    else if (value.indexOf('0x') === 0)\n        value = value.substr(2);\n    else if (typeof value === 'string')\n        value = formatInputInt(new BigNumber(value));\n    else\n        value = (+value).toString(16);\n    return padLeft(value, padding);\n};\n\n/// Formats input value to byte representation of string\n/// @returns left-algined byte representation of string\nvar formatInputString = function (value) {\n    return web3.fromAscii(value, ETH_PADDING).substr(2);\n};\n\n/// Formats input value to byte representation of bool\n/// @returns right-aligned byte representation bool\nvar formatInputBool = function (value) {\n    return '000000000000000000000000000000000000000000000000000000000000000' + (value ?  '1' : '0');\n};\n\n/// Formats input value to byte representation of real\n/// Values are multiplied by 2^m and encoded as integers\n/// @returns byte representation of real\nvar formatInputReal = function (value) {\n    return formatInputInt(new BigNumber(value).times(new BigNumber(2).pow(128))); \n};\n\nvar dynamicTypeBytes = function (type, value) {\n    // TODO: decide what to do with array of strings\n    if (arrayType(type) || prefixedType('string')(type))\n        return formatInputInt(value.length); \n    return \"\";\n};\n\n/// Setups input formatters for solidity types\n/// @returns an array of input formatters \nvar setupInputTypes = function () {\n    \n    return [\n        { type: prefixedType('uint'), format: formatInputInt },\n        { type: prefixedType('int'), format: formatInputInt },\n        { type: prefixedType('hash'), format: formatInputInt },\n        { type: prefixedType('string'), format: formatInputString }, \n        { type: prefixedType('real'), format: formatInputReal },\n        { type: prefixedType('ureal'), format: formatInputReal },\n        { type: namedType('address'), format: formatInputInt },\n        { type: namedType('bool'), format: formatInputBool }\n    ];\n};\n\nvar inputTypes = setupInputTypes();\n\n/// Formats input params to bytes\n/// @param contract json abi\n/// @param name of the method that we want to use\n/// @param array of params that will be formatted to bytes\n/// @returns bytes representation of input params\nvar toAbiInput = function (json, methodName, params) {\n    var bytes = \"\";\n    var index = findMethodIndex(json, methodName);\n\n    if (index === -1) {\n        return;\n    }\n\n    var method = json[index];\n    var padding = ETH_PADDING * 2;\n\n    /// first we iterate in search for dynamic \n    method.inputs.forEach(function (input, index) {\n        bytes += dynamicTypeBytes(input.type, params[index]);\n    });\n\n    method.inputs.forEach(function (input, i) {\n        var typeMatch = false;\n        for (var j = 0; j < inputTypes.length && !typeMatch; j++) {\n            typeMatch = inputTypes[j].type(method.inputs[i].type, params[i]);\n        }\n        if (!typeMatch) {\n            console.error('input parser does not support type: ' + method.inputs[i].type);\n        }\n\n        var formatter = inputTypes[j - 1].format;\n        var toAppend = \"\";\n\n        if (arrayType(method.inputs[i].type))\n            toAppend = params[i].reduce(function (acc, curr) {\n                return acc + formatter(curr);\n            }, \"\");\n        else\n            toAppend = formatter(params[i]);\n\n        bytes += toAppend; \n    });\n    return bytes;\n};\n\n/// Check if input value is negative\n/// @param value is hex format\n/// @returns true if it is negative, otherwise false\nvar signedIsNegative = function (value) {\n    return (new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1)) === '1';\n};\n\n/// Formats input right-aligned input bytes to int\n/// @returns right-aligned input bytes formatted to int\nvar formatOutputInt = function (value) {\n    // check if it's negative number\n    // it it is, return two's complement\n    if (signedIsNegative(value)) {\n        return new BigNumber(value, 16).minus(new BigNumber('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)).minus(1);\n    }\n    return new BigNumber(value, 16);\n};\n\n/// Formats big right-aligned input bytes to uint\n/// @returns right-aligned input bytes formatted to uint\nvar formatOutputUInt = function (value) {\n    return new BigNumber(value, 16);\n};\n\n/// @returns input bytes formatted to real\nvar formatOutputReal = function (value) {\n    return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128)); \n};\n\n/// @returns input bytes formatted to ureal\nvar formatOutputUReal = function (value) {\n    return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128)); \n};\n\n/// @returns right-aligned input bytes formatted to hex\nvar formatOutputHash = function (value) {\n    return \"0x\" + value;\n};\n\n/// @returns right-aligned input bytes formatted to bool\nvar formatOutputBool = function (value) {\n    return value === '0000000000000000000000000000000000000000000000000000000000000001' ? true : false;\n};\n\n/// @returns left-aligned input bytes formatted to ascii string\nvar formatOutputString = function (value) {\n    return web3.toAscii(value);\n};\n\n/// @returns right-aligned input bytes formatted to address\nvar formatOutputAddress = function (value) {\n    return \"0x\" + value.slice(value.length - 40, value.length);\n};\n\nvar dynamicBytesLength = function (type) {\n    if (arrayType(type) || prefixedType('string')(type))\n        return ETH_PADDING * 2;\n    return 0;\n};\n\n/// Setups output formaters for solidity types\n/// @returns an array of output formatters\nvar setupOutputTypes = function () {\n\n    return [\n        { type: prefixedType('uint'), format: formatOutputUInt },\n        { type: prefixedType('int'), format: formatOutputInt },\n        { type: prefixedType('hash'), format: formatOutputHash },\n        { type: prefixedType('string'), format: formatOutputString },\n        { type: prefixedType('real'), format: formatOutputReal },\n        { type: prefixedType('ureal'), format: formatOutputUReal },\n        { type: namedType('address'), format: formatOutputAddress },\n        { type: namedType('bool'), format: formatOutputBool }\n    ];\n};\n\nvar outputTypes = setupOutputTypes();\n\n/// Formats output bytes back to param list\n/// @param contract json abi\n/// @param name of the method that we want to use\n/// @param bytes representtion of output \n/// @returns array of output params \nvar fromAbiOutput = function (json, methodName, output) {\n    var index = findMethodIndex(json, methodName);\n\n    if (index === -1) {\n        return;\n    }\n\n    output = output.slice(2);\n\n    var result = [];\n    var method = json[index];\n    var padding = ETH_PADDING * 2;\n\n    var dynamicPartLength = method.outputs.reduce(function (acc, curr) {\n        return acc + dynamicBytesLength(curr.type);\n    }, 0);\n    \n    var dynamicPart = output.slice(0, dynamicPartLength);\n    output = output.slice(dynamicPartLength);\n\n    method.outputs.forEach(function (out, i) {\n        var typeMatch = false;\n        for (var j = 0; j < outputTypes.length && !typeMatch; j++) {\n            typeMatch = outputTypes[j].type(method.outputs[i].type);\n        }\n\n        if (!typeMatch) {\n            console.error('output parser does not support type: ' + method.outputs[i].type);\n        }\n\n        var formatter = outputTypes[j - 1].format;\n        if (arrayType(method.outputs[i].type)) {\n            var size = formatOutputUInt(dynamicPart.slice(0, padding));\n            dynamicPart = dynamicPart.slice(padding);\n            var array = [];\n            for (var k = 0; k < size; k++) {\n                array.push(formatter(output.slice(0, padding))); \n                output = output.slice(padding);\n            }\n            result.push(array);\n        }\n        else if (prefixedType('string')(method.outputs[i].type)) {\n            dynamicPart = dynamicPart.slice(padding); \n            result.push(formatter(output.slice(0, padding)));\n            output = output.slice(padding);\n        } else {\n            result.push(formatter(output.slice(0, padding)));\n            output = output.slice(padding);\n        }\n    });\n\n    return result;\n};\n\n/// @param json abi for contract\n/// @returns input parser object for given json abi\nvar inputParser = function (json) {\n    var parser = {};\n    json.forEach(function (method) {\n        parser[method.name] = function () {\n            var params = Array.prototype.slice.call(arguments);\n            return toAbiInput(json, method.name, params);\n        };\n    });\n\n    return parser;\n};\n\n/// @param json abi for contract\n/// @returns output parser for given json abi\nvar outputParser = function (json) {\n    var parser = {};\n    json.forEach(function (method) {\n        parser[method.name] = function (output) {\n            return fromAbiOutput(json, method.name, output);\n        };\n    });\n\n    return parser;\n};\n\n/// @param json abi for contract\n/// @param method name for which we want to get method signature\n/// @returns (promise) contract method signature for method with given name\nvar methodSignature = function (json, name) {\n    var method = json[findMethodIndex(json, name)];\n    var result = name + '(';\n    var inputTypes = method.inputs.map(function (inp) {\n        return inp.type;\n    });\n    result += inputTypes.join(',');\n    result += ')';\n\n    return web3.sha3(web3.fromAscii(result));\n};\n\nmodule.exports = {\n    inputParser: inputParser,\n    outputParser: outputParser,\n    methodSignature: methodSignature\n};\n\n",
+    "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file abi.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n *   Gav Wood <g@ethdev.com>\n * @date 2014\n */\n\n// TODO: is these line is supposed to be here? \nif (\"build\" !== 'build') {/*\n    var BigNumber = require('bignumber.js'); // jshint ignore:line\n*/}\n\nvar web3 = require('./web3'); // jshint ignore:line\n\nBigNumber.config({ ROUNDING_MODE: BigNumber.ROUND_DOWN });\n\nvar ETH_PADDING = 32;\n\n/// Finds first index of array element matching pattern\n/// @param array\n/// @param callback pattern\n/// @returns index of element\nvar findIndex = function (array, callback) {\n    var end = false;\n    var i = 0;\n    for (; i < array.length && !end; i++) {\n        end = callback(array[i]);\n    }\n    return end ? i - 1 : -1;\n};\n\n/// @returns a function that is used as a pattern for 'findIndex'\nvar findMethodIndex = function (json, methodName) {\n    return findIndex(json, function (method) {\n        return method.name === methodName;\n    });\n};\n\n/// @param string string to be padded\n/// @param number of characters that result string should have\n/// @param sign, by default 0\n/// @returns right aligned string\nvar padLeft = function (string, chars, sign) {\n    return new Array(chars - string.length + 1).join(sign ? sign : \"0\") + string;\n};\n\n/// @param expected type prefix (string)\n/// @returns function which checks if type has matching prefix. if yes, returns true, otherwise false\nvar prefixedType = function (prefix) {\n    return function (type) {\n        return type.indexOf(prefix) === 0;\n    };\n};\n\n/// @param expected type name (string)\n/// @returns function which checks if type is matching expected one. if yes, returns true, otherwise false\nvar namedType = function (name) {\n    return function (type) {\n        return name === type;\n    };\n};\n\nvar arrayType = function (type) {\n    return type.slice(-2) === '[]';\n};\n\n/// Formats input value to byte representation of int\n/// If value is negative, return it's two's complement\n/// If the value is floating point, round it down\n/// @returns right-aligned byte representation of int\nvar formatInputInt = function (value) {\n    var padding = ETH_PADDING * 2;\n    if (value instanceof BigNumber || typeof value === 'number') {\n        if (typeof value === 'number')\n            value = new BigNumber(value);\n        value = value.round();\n\n        if (value.lessThan(0)) \n            value = new BigNumber(\"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\", 16).plus(value).plus(1);\n        value = value.toString(16);\n    }\n    else if (value.indexOf('0x') === 0)\n        value = value.substr(2);\n    else if (typeof value === 'string')\n        value = formatInputInt(new BigNumber(value));\n    else\n        value = (+value).toString(16);\n    return padLeft(value, padding);\n};\n\n/// Formats input value to byte representation of string\n/// @returns left-algined byte representation of string\nvar formatInputString = function (value) {\n    return web3.fromAscii(value, ETH_PADDING).substr(2);\n};\n\n/// Formats input value to byte representation of bool\n/// @returns right-aligned byte representation bool\nvar formatInputBool = function (value) {\n    return '000000000000000000000000000000000000000000000000000000000000000' + (value ?  '1' : '0');\n};\n\n/// Formats input value to byte representation of real\n/// Values are multiplied by 2^m and encoded as integers\n/// @returns byte representation of real\nvar formatInputReal = function (value) {\n    return formatInputInt(new BigNumber(value).times(new BigNumber(2).pow(128))); \n};\n\nvar dynamicTypeBytes = function (type, value) {\n    // TODO: decide what to do with array of strings\n    if (arrayType(type) || prefixedType('string')(type))\n        return formatInputInt(value.length); \n    return \"\";\n};\n\n/// Setups input formatters for solidity types\n/// @returns an array of input formatters \nvar setupInputTypes = function () {\n    \n    return [\n        { type: prefixedType('uint'), format: formatInputInt },\n        { type: prefixedType('int'), format: formatInputInt },\n        { type: prefixedType('hash'), format: formatInputInt },\n        { type: prefixedType('string'), format: formatInputString }, \n        { type: prefixedType('real'), format: formatInputReal },\n        { type: prefixedType('ureal'), format: formatInputReal },\n        { type: namedType('address'), format: formatInputInt },\n        { type: namedType('bool'), format: formatInputBool }\n    ];\n};\n\nvar inputTypes = setupInputTypes();\n\n/// Formats input params to bytes\n/// @param contract json abi\n/// @param name of the method that we want to use\n/// @param array of params that will be formatted to bytes\n/// @returns bytes representation of input params\nvar toAbiInput = function (json, methodName, params) {\n    var bytes = \"\";\n    var index = findMethodIndex(json, methodName);\n\n    if (index === -1) {\n        return;\n    }\n\n    var method = json[index];\n    var padding = ETH_PADDING * 2;\n\n    /// first we iterate in search for dynamic \n    method.inputs.forEach(function (input, index) {\n        bytes += dynamicTypeBytes(input.type, params[index]);\n    });\n\n    method.inputs.forEach(function (input, i) {\n        var typeMatch = false;\n        for (var j = 0; j < inputTypes.length && !typeMatch; j++) {\n            typeMatch = inputTypes[j].type(method.inputs[i].type, params[i]);\n        }\n        if (!typeMatch) {\n            console.error('input parser does not support type: ' + method.inputs[i].type);\n        }\n\n        var formatter = inputTypes[j - 1].format;\n        var toAppend = \"\";\n\n        if (arrayType(method.inputs[i].type))\n            toAppend = params[i].reduce(function (acc, curr) {\n                return acc + formatter(curr);\n            }, \"\");\n        else\n            toAppend = formatter(params[i]);\n\n        bytes += toAppend; \n    });\n    return bytes;\n};\n\n/// Check if input value is negative\n/// @param value is hex format\n/// @returns true if it is negative, otherwise false\nvar signedIsNegative = function (value) {\n    return (new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1)) === '1';\n};\n\n/// Formats input right-aligned input bytes to int\n/// @returns right-aligned input bytes formatted to int\nvar formatOutputInt = function (value) {\n    // check if it's negative number\n    // it it is, return two's complement\n    if (signedIsNegative(value)) {\n        return new BigNumber(value, 16).minus(new BigNumber('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)).minus(1);\n    }\n    return new BigNumber(value, 16);\n};\n\n/// Formats big right-aligned input bytes to uint\n/// @returns right-aligned input bytes formatted to uint\nvar formatOutputUInt = function (value) {\n    return new BigNumber(value, 16);\n};\n\n/// @returns input bytes formatted to real\nvar formatOutputReal = function (value) {\n    return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128)); \n};\n\n/// @returns input bytes formatted to ureal\nvar formatOutputUReal = function (value) {\n    return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128)); \n};\n\n/// @returns right-aligned input bytes formatted to hex\nvar formatOutputHash = function (value) {\n    return \"0x\" + value;\n};\n\n/// @returns right-aligned input bytes formatted to bool\nvar formatOutputBool = function (value) {\n    return value === '0000000000000000000000000000000000000000000000000000000000000001' ? true : false;\n};\n\n/// @returns left-aligned input bytes formatted to ascii string\nvar formatOutputString = function (value) {\n    return web3.toAscii(value);\n};\n\n/// @returns right-aligned input bytes formatted to address\nvar formatOutputAddress = function (value) {\n    return \"0x\" + value.slice(value.length - 40, value.length);\n};\n\nvar dynamicBytesLength = function (type) {\n    if (arrayType(type) || prefixedType('string')(type))\n        return ETH_PADDING * 2;\n    return 0;\n};\n\n/// Setups output formaters for solidity types\n/// @returns an array of output formatters\nvar setupOutputTypes = function () {\n\n    return [\n        { type: prefixedType('uint'), format: formatOutputUInt },\n        { type: prefixedType('int'), format: formatOutputInt },\n        { type: prefixedType('hash'), format: formatOutputHash },\n        { type: prefixedType('string'), format: formatOutputString },\n        { type: prefixedType('real'), format: formatOutputReal },\n        { type: prefixedType('ureal'), format: formatOutputUReal },\n        { type: namedType('address'), format: formatOutputAddress },\n        { type: namedType('bool'), format: formatOutputBool }\n    ];\n};\n\nvar outputTypes = setupOutputTypes();\n\n/// Formats output bytes back to param list\n/// @param contract json abi\n/// @param name of the method that we want to use\n/// @param bytes representtion of output \n/// @returns array of output params \nvar fromAbiOutput = function (json, methodName, output) {\n    var index = findMethodIndex(json, methodName);\n\n    if (index === -1) {\n        return;\n    }\n\n    output = output.slice(2);\n\n    var result = [];\n    var method = json[index];\n    var padding = ETH_PADDING * 2;\n\n    var dynamicPartLength = method.outputs.reduce(function (acc, curr) {\n        return acc + dynamicBytesLength(curr.type);\n    }, 0);\n    \n    var dynamicPart = output.slice(0, dynamicPartLength);\n    output = output.slice(dynamicPartLength);\n\n    method.outputs.forEach(function (out, i) {\n        var typeMatch = false;\n        for (var j = 0; j < outputTypes.length && !typeMatch; j++) {\n            typeMatch = outputTypes[j].type(method.outputs[i].type);\n        }\n\n        if (!typeMatch) {\n            console.error('output parser does not support type: ' + method.outputs[i].type);\n        }\n\n        var formatter = outputTypes[j - 1].format;\n        if (arrayType(method.outputs[i].type)) {\n            var size = formatOutputUInt(dynamicPart.slice(0, padding));\n            dynamicPart = dynamicPart.slice(padding);\n            var array = [];\n            for (var k = 0; k < size; k++) {\n                array.push(formatter(output.slice(0, padding))); \n                output = output.slice(padding);\n            }\n            result.push(array);\n        }\n        else if (prefixedType('string')(method.outputs[i].type)) {\n            dynamicPart = dynamicPart.slice(padding); \n            result.push(formatter(output.slice(0, padding)));\n            output = output.slice(padding);\n        } else {\n            result.push(formatter(output.slice(0, padding)));\n            output = output.slice(padding);\n        }\n    });\n\n    return result;\n};\n\n/// @returns display name for method eg. multiply(uint256) -> multiply\nvar methodDisplayName = function (method) {\n    var length = method.indexOf('('); \n    return length !== -1 ? method.substr(0, length) : method;\n};\n\n/// @returns overloaded part of method's name\nvar methodTypeName = function (method) {\n    /// TODO: make it not vulnerable\n    var length = method.indexOf('(');\n    return length !== -1 ? method.substr(length + 1, method.length - 1 - (length + 1)) : \"\";\n};\n\n/// @param json abi for contract\n/// @returns input parser object for given json abi\nvar inputParser = function (json) {\n    var parser = {};\n    json.forEach(function (method) {\n        var displayName = methodDisplayName(method.name); \n        var typeName = methodTypeName(method.name);\n\n        var impl = function () {\n            var params = Array.prototype.slice.call(arguments);\n            return toAbiInput(json, method.name, params);\n        };\n       \n        if (parser[displayName] === undefined) {\n            parser[displayName] = impl;\n        }\n\n        parser[displayName][typeName] = impl;\n    });\n\n    return parser;\n};\n\n/// @param json abi for contract\n/// @returns output parser for given json abi\nvar outputParser = function (json) {\n    var parser = {};\n    json.forEach(function (method) {\n\n        var displayName = methodDisplayName(method.name); \n        var typeName = methodTypeName(method.name);\n\n        var impl = function (output) {\n            return fromAbiOutput(json, method.name, output);\n        };\n\n        if (parser[displayName] === undefined) {\n            parser[displayName] = impl;\n        }\n\n        parser[displayName][typeName] = impl;\n    });\n\n    return parser;\n};\n\n/// @param json abi for contract\n/// @param method name for which we want to get method signature\n/// @returns (promise) contract method signature for method with given name\nvar methodSignature = function (json, name) {\n    return web3.sha3(web3.fromAscii(name));\n};\n\nmodule.exports = {\n    inputParser: inputParser,\n    outputParser: outputParser,\n    methodSignature: methodSignature,\n    methodDisplayName: methodDisplayName,\n    methodTypeName: methodTypeName\n};\n\n",
     "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file autoprovider.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n *   Marian Oancea <marian@ethdev.com>\n * @date 2014\n */\n\n/*\n * @brief if qt object is available, uses QtProvider,\n * if not tries to connect over websockets\n * if it fails, it uses HttpRpcProvider\n */\n\nvar web3 = require('./web3'); // jshint ignore:line\nif (\"build\" !== 'build') {/*\n    var WebSocket = require('ws'); // jshint ignore:line\n*/}\n\n/**\n * AutoProvider object prototype is implementing 'provider protocol'\n * Automatically tries to setup correct provider(Qt, WebSockets or HttpRpc)\n * First it checkes if we are ethereum browser (if navigator.qt object is available)\n * if yes, we are using QtProvider\n * if no, we check if it is possible to establish websockets connection with ethereum (ws://localhost:40404/eth is default)\n * if it's not possible, we are using httprpc provider (http://localhost:8080)\n * The constructor allows you to specify uris on which we are trying to connect over http or websockets\n * You can do that by passing objects with fields httrpc and websockets\n */\nvar AutoProvider = function (userOptions) {\n    if (web3.haveProvider()) {\n        return;\n    }\n\n    // before we determine what provider we are, we have to cache request\n    this.sendQueue = [];\n    this.onmessageQueue = [];\n\n    if (navigator.qt) {\n        this.provider = new web3.providers.QtProvider();\n        return;\n    }\n\n    userOptions = userOptions || {};\n    var options = {\n        httprpc: userOptions.httprpc || 'http://localhost:8080',\n        websockets: userOptions.websockets || 'ws://localhost:40404/eth'\n    };\n\n    var self = this;\n    var closeWithSuccess = function (success) {\n        ws.close();\n        if (success) {\n            self.provider = new web3.providers.WebSocketProvider(options.websockets);\n        } else {\n            self.provider = new web3.providers.HttpRpcProvider(options.httprpc);\n            self.poll = self.provider.poll.bind(self.provider);\n        }\n        self.sendQueue.forEach(function (payload) {\n            self.provider.send(payload);\n        });\n        self.onmessageQueue.forEach(function (handler) {\n            self.provider.onmessage = handler;\n        });\n    };\n\n    var ws = new WebSocket(options.websockets);\n\n    ws.onopen = function() {\n        closeWithSuccess(true);\n    };\n\n    ws.onerror = function() {\n        closeWithSuccess(false);\n    };\n};\n\n/// Sends message forward to the provider, that is being used\n/// if provider is not yet set, enqueues the message\nAutoProvider.prototype.send = function (payload) {\n    if (this.provider) {\n        this.provider.send(payload);\n        return;\n    }\n    this.sendQueue.push(payload);\n};\n\n/// On incoming message sends the message to the provider that is currently being used\nObject.defineProperty(AutoProvider.prototype, 'onmessage', {\n    set: function (handler) {\n        if (this.provider) {\n            this.provider.onmessage = handler;\n            return;\n        }\n        this.onmessageQueue.push(handler);\n    }\n});\n\nmodule.exports = AutoProvider;\n",
-    "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file contract.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n * @date 2014\n */\n\nvar web3 = require('./web3'); // jshint ignore:line\nvar abi = require('./abi');\n\n/// method signature length in bytes\nvar ETH_METHOD_SIGNATURE_LENGTH = 4;\n\n/**\n * This method should be called when we want to call / transact some solidity method from javascript\n * it returns an object which has same methods available as solidity contract description\n * usage example: \n *\n * var abi = [{\n *      name: 'myMethod',\n *      inputs: [{ name: 'a', type: 'string' }],\n *      outputs: [{name: 'd', type: 'string' }]\n * }];  // contract abi\n *\n * var myContract = web3.eth.contract('0x0123123121', abi); // creation of contract object\n *\n * myContract.myMethod('this is test string param for call').call(); // myMethod call\n * myContract.myMethod('this is test string param for transact').transact() // myMethod transact\n *\n * @param address - address of the contract, which should be called\n * @param desc - abi json description of the contract, which is being created\n * @returns contract object\n */\nvar contract = function (address, desc) {\n    var inputParser = abi.inputParser(desc);\n    var outputParser = abi.outputParser(desc);\n\n    var contract = {};\n\n    desc.forEach(function (method) {\n        contract[method.name] = function () {\n            var params = Array.prototype.slice.call(arguments);\n            var parsed = inputParser[method.name].apply(null, params);\n\n            var onSuccess = function (result) {\n                return outputParser[method.name](result);\n            };\n\n            return {\n                call: function (extra) {\n                    extra = extra || {};\n                    extra.to = address;\n                    return abi.methodSignature(desc, method.name).then(function (signature) {\n                        extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;\n                        return web3.eth.call(extra).then(onSuccess);\n                    });\n                },\n                transact: function (extra) {\n                    extra = extra || {};\n                    extra.to = address;\n                    return abi.methodSignature(desc, method.name).then(function (signature) {\n                        extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;\n                        return web3.eth.transact(extra).then(onSuccess);\n                    });\n                }\n            };\n        };\n    });\n\n    return contract;\n};\n\nmodule.exports = contract;\n\n",
+    "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file contract.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n * @date 2014\n */\n\nvar web3 = require('./web3'); // jshint ignore:line\nvar abi = require('./abi');\n\n/// method signature length in bytes\nvar ETH_METHOD_SIGNATURE_LENGTH = 4;\n\n/**\n * This method should be called when we want to call / transact some solidity method from javascript\n * it returns an object which has same methods available as solidity contract description\n * usage example: \n *\n * var abi = [{\n *      name: 'myMethod',\n *      inputs: [{ name: 'a', type: 'string' }],\n *      outputs: [{name: 'd', type: 'string' }]\n * }];  // contract abi\n *\n * var myContract = web3.eth.contract('0x0123123121', abi); // creation of contract object\n *\n * myContract.myMethod('this is test string param for call').call(); // myMethod call\n * myContract.myMethod('this is test string param for transact').transact() // myMethod transact\n *\n * @param address - address of the contract, which should be called\n * @param desc - abi json description of the contract, which is being created\n * @returns contract object\n */\nvar contract = function (address, desc) {\n    var inputParser = abi.inputParser(desc);\n    var outputParser = abi.outputParser(desc);\n\n    var contract = {};\n\n    desc.forEach(function (method) {\n\n        var displayName = abi.methodDisplayName(method.name);\n        var typeName = abi.methodTypeName(method.name);\n\n        var impl = function () {\n            var params = Array.prototype.slice.call(arguments);\n            var parsed = inputParser[displayName][typeName].apply(null, params);\n\n            var onSuccess = function (result) {\n                return outputParser[displayName][typeName](result);\n            };\n\n            return {\n                call: function (extra) {\n                    extra = extra || {};\n                    extra.to = address;\n                    return abi.methodSignature(desc, method.name).then(function (signature) {\n                        extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;\n                        return web3.eth.call(extra).then(onSuccess);\n                    });\n                },\n                transact: function (extra) {\n                    extra = extra || {};\n                    extra.to = address;\n                    return abi.methodSignature(desc, method.name).then(function (signature) {\n                        extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;\n                        return web3.eth.transact(extra).then(onSuccess);\n                    });\n                }\n            };\n        };\n\n        if (contract[displayName] === undefined) {\n            contract[displayName] = impl;\n        }\n\n        contract[displayName][typeName] = impl;\n    });\n\n    return contract;\n};\n\nmodule.exports = contract;\n\n",
     "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file filter.js\n * @authors:\n *   Jeffrey Wilcke <jeff@ethdev.com>\n *   Marek Kotewicz <marek@ethdev.com>\n *   Marian Oancea <marian@ethdev.com>\n *   Gav Wood <g@ethdev.com>\n * @date 2014\n */\n\nvar web3 = require('./web3'); // jshint ignore:line\n\n/// should be used when we want to watch something\n/// it's using inner polling mechanism and is notified about changes\nvar Filter = function(options, impl) {\n    this.impl = impl;\n    this.callbacks = [];\n\n    var self = this;\n    this.promise = impl.newFilter(options);\n    this.promise.then(function (id) {\n        self.id = id;\n        web3.on(impl.changed, id, self.trigger.bind(self));\n        web3.provider.startPolling({call: impl.changed, args: [id]}, id);\n    });\n};\n\n/// alias for changed*\nFilter.prototype.arrived = function(callback) {\n    this.changed(callback);\n};\n\n/// gets called when there is new eth/shh message\nFilter.prototype.changed = function(callback) {\n    var self = this;\n    this.promise.then(function(id) {\n        self.callbacks.push(callback);\n    });\n};\n\n/// trigger calling new message from people\nFilter.prototype.trigger = function(messages) {\n    for(var i = 0; i < this.callbacks.length; i++) {\n        this.callbacks[i].call(this, messages);\n    }\n};\n\n/// should be called to uninstall current filter\nFilter.prototype.uninstall = function() {\n    var self = this;\n    this.promise.then(function (id) {\n        self.impl.uninstallFilter(id);\n        web3.provider.stopPolling(id);\n        web3.off(impl.changed, id);\n    });\n};\n\n/// should be called to manually trigger getting latest messages from the client\nFilter.prototype.messages = function() {\n    var self = this;\n    return this.promise.then(function (id) {\n        return self.impl.getMessages(id);\n    });\n};\n\n/// alias for messages\nFilter.prototype.logs = function () {\n    return this.messages();\n};\n\nmodule.exports = Filter;\n",
     "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file httprpc.js\n * @authors:\n *   Marek Kotewicz <marek@ethdev.com>\n *   Marian Oancea <marian@ethdev.com>\n * @date 2014\n */\n\n// TODO: is these line is supposed to be here? \nif (\"build\" !== 'build') {/*\n    var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line\n*/}\n\n/**\n * HttpRpcProvider object prototype is implementing 'provider protocol'\n * Should be used when we want to connect to ethereum backend over http && jsonrpc\n * It's compatible with cpp client\n * The contructor allows to specify host uri\n * This provider is using in-browser polling mechanism\n */\nvar HttpRpcProvider = function (host) {\n    this.handlers = [];\n    this.host = host;\n};\n\n/// Transforms inner message to proper jsonrpc object\n/// @param inner message object\n/// @returns jsonrpc object\nfunction formatJsonRpcObject(object) {\n    return {\n        jsonrpc: '2.0',\n        method: object.call,\n        params: object.args,\n        id: object._id\n    };\n}\n\n/// Transforms jsonrpc object to inner message\n/// @param incoming jsonrpc message \n/// @returns inner message object\nfunction formatJsonRpcMessage(message) {\n    var object = JSON.parse(message);\n\n    return {\n        _id: object.id,\n        data: object.result,\n        error: object.error\n    };\n}\n\n/// Prototype object method \n/// Asynchronously sends request to server\n/// @param payload is inner message object\n/// @param cb is callback which is being called when response is comes back\nHttpRpcProvider.prototype.sendRequest = function (payload, cb) {\n    var data = formatJsonRpcObject(payload);\n\n    var request = new XMLHttpRequest();\n    request.open(\"POST\", this.host, true);\n    request.send(JSON.stringify(data));\n    request.onreadystatechange = function () {\n        if (request.readyState === 4 && cb) {\n            cb(request);\n        }\n    };\n};\n\n/// Prototype object method\n/// Should be called when we want to send single api request to server\n/// Asynchronous\n/// On response it passes message to handlers\n/// @param payload is inner message object\nHttpRpcProvider.prototype.send = function (payload) {\n    var self = this;\n    this.sendRequest(payload, function (request) {\n        self.handlers.forEach(function (handler) {\n            handler.call(self, formatJsonRpcMessage(request.responseText));\n        });\n    });\n};\n\n/// Prototype object method\n/// Should be called only for polling requests\n/// Asynchronous\n/// On response it passege message to handlers, but only if message's result is true or not empty array\n/// Otherwise response is being silently ignored\n/// @param payload is inner message object\n/// @id is id of poll that we are calling\nHttpRpcProvider.prototype.poll = function (payload, id) {\n    var self = this;\n    this.sendRequest(payload, function (request) {\n        var parsed = JSON.parse(request.responseText);\n        if (parsed.error || (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result)) {\n            return;\n        }\n        self.handlers.forEach(function (handler) {\n            handler.call(self, {_event: payload.call, _id: id, data: parsed.result});\n        });\n    });\n};\n\n/// Prototype object property\n/// Should be used to set message handlers for this provider\nObject.defineProperty(HttpRpcProvider.prototype, \"onmessage\", {\n    set: function (handler) {\n        this.handlers.push(handler);\n    }\n});\n\nmodule.exports = HttpRpcProvider;\n\n",
     "/*\n    This file is part of ethereum.js.\n\n    ethereum.js is free software: you can redistribute it and/or modify\n    it under the terms of the GNU Lesser General Public License as published by\n    the Free Software Foundation, either version 3 of the License, or\n    (at your option) any later version.\n\n    ethereum.js is distributed in the hope that it will be useful,\n    but WITHOUT ANY WARRANTY; without even the implied warranty of\n    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n    GNU Lesser General Public License for more details.\n\n    You should have received a copy of the GNU Lesser General Public License\n    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.\n*/\n/** @file providermanager.js\n * @authors:\n *   Jeffrey Wilcke <jeff@ethdev.com>\n *   Marek Kotewicz <marek@ethdev.com>\n *   Marian Oancea <marian@ethdev.com>\n *   Gav Wood <g@ethdev.com>\n * @date 2014\n */\n\nvar web3 = require('./web3'); // jshint ignore:line\n\n/**\n * Provider manager object prototype\n * It's responsible for passing messages to providers\n * If no provider is set it's responsible for queuing requests\n * It's also responsible for polling the ethereum node for incoming messages\n * Default poll timeout is 12 seconds\n * If we are running ethereum.js inside ethereum browser, there are backend based tools responsible for polling,\n * and provider manager polling mechanism is not used\n */\nvar ProviderManager = function() {\n    this.queued = [];\n    this.polls = [];\n    this.ready = false;\n    this.provider = undefined;\n    this.id = 1;\n\n    var self = this;\n    var poll = function () {\n        if (self.provider && self.provider.poll) {\n            self.polls.forEach(function (data) {\n                data.data._id = self.id;\n                self.id++;\n                self.provider.poll(data.data, data.id);\n            });\n        }\n        setTimeout(poll, 12000);\n    };\n    poll();\n};\n\n/// sends outgoing requests, if provider is not available, enqueue the request\nProviderManager.prototype.send = function(data, cb) {\n    data._id = this.id;\n    if (cb) {\n        web3._callbacks[data._id] = cb;\n    }\n\n    data.args = data.args || [];\n    this.id++;\n\n    if(this.provider !== undefined) {\n        this.provider.send(data);\n    } else {\n        console.warn(\"provider is not set\");\n        this.queued.push(data);\n    }\n};\n\n/// setups provider, which will be used for sending messages\nProviderManager.prototype.set = function(provider) {\n    if(this.provider !== undefined && this.provider.unload !== undefined) {\n        this.provider.unload();\n    }\n\n    this.provider = provider;\n    this.ready = true;\n};\n\n/// resends queued messages\nProviderManager.prototype.sendQueued = function() {\n    for(var i = 0; this.queued.length; i++) {\n        // Resend\n        this.send(this.queued[i]);\n    }\n};\n\n/// @returns true if the provider i properly set\nProviderManager.prototype.installed = function() {\n    return this.provider !== undefined;\n};\n\n/// this method is only used, when we do not have native qt bindings and have to do polling on our own\n/// should be callled, on start watching for eth/shh changes\nProviderManager.prototype.startPolling = function (data, pollId) {\n    if (!this.provider || !this.provider.poll) {\n        return;\n    }\n    this.polls.push({data: data, id: pollId});\n};\n\n/// should be called to stop polling for certain watch changes\nProviderManager.prototype.stopPolling = function (pollId) {\n    for (var i = this.polls.length; i--;) {\n        var poll = this.polls[i];\n        if (poll.id === pollId) {\n            this.polls.splice(i, 1);\n        }\n    }\n};\n\nmodule.exports = ProviderManager;\n\n",
diff --git a/dist/ethereum.min.js b/dist/ethereum.min.js
index fba5e4db5..375752e73 100644
--- a/dist/ethereum.min.js
+++ b/dist/ethereum.min.js
@@ -1 +1 @@
-require=function e(t,n,r){function i(s,a){if(!n[s]){if(!t[s]){var u="function"==typeof require&&require;if(!a&&u)return u(s,!0);if(o)return o(s,!0);var f=new Error("Cannot find module '"+s+"'");throw f.code="MODULE_NOT_FOUND",f}var c=n[s]={exports:{}};t[s][0].call(c.exports,function(e){var n=t[s][1][e];return i(n?n:e)},c,c.exports,e,t,n,r)}return n[s].exports}for(var o="function"==typeof require&&require,s=0;s<r.length;s++)i(r[s]);return i}({1:[function(e,t){var n=e("./web3");BigNumber.config({ROUNDING_MODE:BigNumber.ROUND_DOWN});var r=32,i=function(e,t){for(var n=!1,r=0;r<e.length&&!n;r++)n=t(e[r]);return n?r-1:-1},o=function(e,t){return i(e,function(e){return e.name===t})},s=function(e,t,n){return new Array(t-e.length+1).join(n?n:"0")+e},a=function(e){return function(t){return 0===t.indexOf(e)}},u=function(e){return function(t){return e===t}},f=function(e){return"[]"===e.slice(-2)},c=function(e){var t=2*r;return e instanceof BigNumber||"number"==typeof e?("number"==typeof e&&(e=new 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i=!1,o=0;o<g.length&&!i;o++)i=g[o].type(s.inputs[t].type,n[t]);i||console.error("input parser does not support type: "+s.inputs[t].type);var a=g[o-1].format,u="";u=f(s.inputs[t].type)?n[t].reduce(function(e,t){return e+a(t)},""):a(n[t]),r+=u}),r}},b=function(e){return"1"===new BigNumber(e.substr(0,1),16).toString(2).substr(0,1)},y=function(e){return b(e)?new BigNumber(e,16).minus(new BigNumber("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",16)).minus(1):new BigNumber(e,16)},_=function(e){return new BigNumber(e,16)},w=function(e){return y(e).dividedBy(new BigNumber(2).pow(128))},P=function(e){return _(e).dividedBy(new BigNumber(2).pow(128))},N=function(e){return"0x"+e},x=function(e){return"0000000000000000000000000000000000000000000000000000000000000001"===e?!0:!1},S=function(e){return n.toAscii(e)},k=function(e){return"0x"+e.slice(e.length-40,e.length)},O=function(e){return f(e)||a("string")(e)?2*r:0},B=function(){return[{type:a("uint"),format:_},{type:a("int"),format:y},{type:a("hash"),format:N},{type:a("string"),format:S},{type:a("real"),format:w},{type:a("ureal"),format:P},{type:u("address"),format:k},{type:u("bool"),format:x}]},A=B(),q=function(e,t,n){var i=o(e,t);if(-1!==i){n=n.slice(2);var s=[],u=e[i],c=2*r,l=u.outputs.reduce(function(e,t){return e+O(t.type)},0),p=n.slice(0,l);return n=n.slice(l),u.outputs.forEach(function(e,t){for(var r=!1,i=0;i<A.length&&!r;i++)r=A[i].type(u.outputs[t].type);r||console.error("output parser does not support type: "+u.outputs[t].type);var o=A[i-1].format;if(f(u.outputs[t].type)){var l=_(p.slice(0,c));p=p.slice(c);for(var h=[],d=0;l>d;d++)h.push(o(n.slice(0,c))),n=n.slice(c);s.push(h)}else a("string")(u.outputs[t].type)?(p=p.slice(c),s.push(o(n.slice(0,c))),n=n.slice(c)):(s.push(o(n.slice(0,c))),n=n.slice(c))}),s}},E=function(e){var t=e.indexOf("(");return-1!==t?e.substr(0,t):e},F=function(e){var t=e.indexOf("(");return-1!==t?e.substr(t+1,e.length-1-(t+1)):""},M=function(e){var t={};return e.forEach(function(n){var r=E(n.name),i=F(n.name),o=function(){var t=Array.prototype.slice.call(arguments);return m(e,n.name,t)};void 0===t[r]&&(t[r]=o),t[r][i]=o}),t},D=function(e){var t={};return e.forEach(function(n){var r=E(n.name),i=F(n.name),o=function(t){return q(e,n.name,t)};void 0===t[r]&&(t[r]=o),t[r][i]=o}),t},T=function(e,t){return n.sha3(n.fromAscii(t))};t.exports={inputParser:M,outputParser:D,methodSignature:T,methodDisplayName:E,methodTypeName:F}},{"./web3":8}],2:[function(e,t){var n=e("./web3"),r=function(e){if(!n.haveProvider()){if(this.sendQueue=[],this.onmessageQueue=[],navigator.qt)return void(this.provider=new n.providers.QtProvider);e=e||{};var t={httprpc:e.httprpc||"http://localhost:8080",websockets:e.websockets||"ws://localhost:40404/eth"},r=this,i=function(e){o.close(),e?r.provider=new n.providers.WebSocketProvider(t.websockets):(r.provider=new n.providers.HttpRpcProvider(t.httprpc),r.poll=r.provider.poll.bind(r.provider)),r.sendQueue.forEach(function(e){r.provider.send(e)}),r.onmessageQueue.forEach(function(e){r.provider.onmessage=e})},o=new WebSocket(t.websockets);o.onopen=function(){i(!0)},o.onerror=function(){i(!1)}}};r.prototype.send=function(e){return this.provider?void this.provider.send(e):void this.sendQueue.push(e)},Object.defineProperty(r.prototype,"onmessage",{set:function(e){return this.provider?void(this.provider.onmessage=e):void this.onmessageQueue.push(e)}}),t.exports=r},{"./web3":8}],3:[function(e,t){var n=e("./web3"),r=e("./abi"),i=4,o=function(e,t){var o=r.inputParser(t),s=r.outputParser(t),a={};return t.forEach(function(u){var f=r.methodDisplayName(u.name),c=r.methodTypeName(u.name),l=function(){var a=Array.prototype.slice.call(arguments),l=o[f][c].apply(null,a),p=function(e){return s[f][c](e)};return{call:function(o){return o=o||{},o.to=e,r.methodSignature(t,u.name).then(function(e){return o.data=e.slice(0,2+2*i)+l,n.eth.call(o).then(p)})},transact:function(o){return o=o||{},o.to=e,r.methodSignature(t,u.name).then(function(e){return o.data=e.slice(0,2+2*i)+l,n.eth.transact(o).then(p)})}}};void 0===a[f]&&(a[f]=l),a[f][c]=l}),a};t.exports=o},{"./abi":1,"./web3":8}],4:[function(e,t){var n=e("./web3"),r=function(e,t){this.impl=t,this.callbacks=[];var r=this;this.promise=t.newFilter(e),this.promise.then(function(e){r.id=e,n.on(t.changed,e,r.trigger.bind(r)),n.provider.startPolling({call:t.changed,args:[e]},e)})};r.prototype.arrived=function(e){this.changed(e)},r.prototype.changed=function(e){var t=this;this.promise.then(function(){t.callbacks.push(e)})},r.prototype.trigger=function(e){for(var t=0;t<this.callbacks.length;t++)this.callbacks[t].call(this,e)},r.prototype.uninstall=function(){var e=this;this.promise.then(function(t){e.impl.uninstallFilter(t),n.provider.stopPolling(t),n.off(impl.changed,t)})},r.prototype.messages=function(){var e=this;return this.promise.then(function(t){return e.impl.getMessages(t)})},r.prototype.logs=function(){return this.messages()},t.exports=r},{"./web3":8}],5:[function(e,t){function n(e){return{jsonrpc:"2.0",method:e.call,params:e.args,id:e._id}}function r(e){var t=JSON.parse(e);return{_id:t.id,data:t.result,error:t.error}}var i=function(e){this.handlers=[],this.host=e};i.prototype.sendRequest=function(e,t){var r=n(e),i=new XMLHttpRequest;i.open("POST",this.host,!0),i.send(JSON.stringify(r)),i.onreadystatechange=function(){4===i.readyState&&t&&t(i)}},i.prototype.send=function(e){var t=this;this.sendRequest(e,function(e){t.handlers.forEach(function(n){n.call(t,r(e.responseText))})})},i.prototype.poll=function(e,t){var n=this;this.sendRequest(e,function(r){var i=JSON.parse(r.responseText);!i.error&&(i.result instanceof Array?0!==i.result.length:i.result)&&n.handlers.forEach(function(r){r.call(n,{_event:e.call,_id:t,data:i.result})})})},Object.defineProperty(i.prototype,"onmessage",{set:function(e){this.handlers.push(e)}}),t.exports=i},{}],6:[function(e,t){var n=e("./web3"),r=function(){this.queued=[],this.polls=[],this.ready=!1,this.provider=void 0,this.id=1;var e=this,t=function(){e.provider&&e.provider.poll&&e.polls.forEach(function(t){t.data._id=e.id,e.id++,e.provider.poll(t.data,t.id)}),setTimeout(t,12e3)};t()};r.prototype.send=function(e,t){e._id=this.id,t&&(n._callbacks[e._id]=t),e.args=e.args||[],this.id++,void 0!==this.provider?this.provider.send(e):(console.warn("provider is not set"),this.queued.push(e))},r.prototype.set=function(e){void 0!==this.provider&&void 0!==this.provider.unload&&this.provider.unload(),this.provider=e,this.ready=!0},r.prototype.sendQueued=function(){for(var e=0;this.queued.length;e++)this.send(this.queued[e])},r.prototype.installed=function(){return void 0!==this.provider},r.prototype.startPolling=function(e,t){this.provider&&this.provider.poll&&this.polls.push({data:e,id:t})},r.prototype.stopPolling=function(e){for(var t=this.polls.length;t--;){var n=this.polls[t];n.id===e&&this.polls.splice(t,1)}},t.exports=r},{"./web3":8}],7:[function(e,t){var n=function(){this.handlers=[];var e=this;navigator.qt.onmessage=function(t){e.handlers.forEach(function(n){n.call(e,JSON.parse(t.data))})}};n.prototype.send=function(e){navigator.qt.postMessage(JSON.stringify(e))},Object.defineProperty(n.prototype,"onmessage",{set:function(e){this.handlers.push(e)}}),t.exports=n},{}],8:[function(e,t){function n(e){return e instanceof Promise?Promise.resolve(e):e instanceof Array?new Promise(function(t){var r=e.map(function(e){return n(e)});return Promise.all(r).then(function(n){for(var r=0;r<e.length;r++)e[r]=n[r];t(e)})}):e instanceof Object?new Promise(function(t){var r=Object.keys(e),i=r.map(function(t){return n(e[t])});return Promise.all(i).then(function(n){for(var i=0;i<r.length;i++)e[r[i]]=n[i];t(e)})}):Promise.resolve(e)}function r(e){if(void 0!==e._event)return void v.trigger(e._event,e._id,e.data);if(e._id){var t=v._callbacks[e._id];t&&(t.call(this,e.error,e.data),delete v._callbacks[e._id])}}var i=function(){return[{name:"sha3",call:"web3_sha3"}]},o=function(){var e=function(e){return"string"==typeof e[0]?"eth_blockByHash":"eth_blockByNumber"},t=function(e){return"string"==typeof e[0]?"eth_transactionByHash":"eth_transactionByNumber"},n=function(e){return"string"==typeof e[0]?"eth_uncleByHash":"eth_uncleByNumber"},r=[{name:"balanceAt",call:"eth_balanceAt"},{name:"stateAt",call:"eth_stateAt"},{name:"storageAt",call:"eth_storageAt"},{name:"countAt",call:"eth_countAt"},{name:"codeAt",call:"eth_codeAt"},{name:"transact",call:"eth_transact"},{name:"call",call:"eth_call"},{name:"block",call:e},{name:"transaction",call:t},{name:"uncle",call:n},{name:"compilers",call:"eth_compilers"},{name:"lll",call:"eth_lll"},{name:"solidity",call:"eth_solidity"},{name:"serpent",call:"eth_serpent"},{name:"logs",call:"eth_logs"}];return r},s=function(){return[{name:"coinbase",getter:"eth_coinbase",setter:"eth_setCoinbase"},{name:"listening",getter:"eth_listening",setter:"eth_setListening"},{name:"mining",getter:"eth_mining",setter:"eth_setMining"},{name:"gasPrice",getter:"eth_gasPrice"},{name:"account",getter:"eth_account"},{name:"accounts",getter:"eth_accounts"},{name:"peerCount",getter:"eth_peerCount"},{name:"defaultBlock",getter:"eth_defaultBlock",setter:"eth_setDefaultBlock"},{name:"number",getter:"eth_number"}]},a=function(){return[{name:"put",call:"db_put"},{name:"get",call:"db_get"},{name:"putString",call:"db_putString"},{name:"getString",call:"db_getString"}]},u=function(){return[{name:"post",call:"shh_post"},{name:"newIdentity",call:"shh_newIdentity"},{name:"haveIdentity",call:"shh_haveIdentity"},{name:"newGroup",call:"shh_newGroup"},{name:"addToGroup",call:"shh_addToGroup"}]},f=function(){var e=function(e){return"string"==typeof e[0]?"eth_newFilterString":"eth_newFilter"};return[{name:"newFilter",call:e},{name:"uninstallFilter",call:"eth_uninstallFilter"},{name:"getMessages",call:"eth_filterLogs"}]},c=function(){return[{name:"newFilter",call:"shh_newFilter"},{name:"uninstallFilter",call:"shh_uninstallFilter"},{name:"getMessage",call:"shh_getMessages"}]},l=function(e,t){t.forEach(function(t){e[t.name]=function(){return n(Array.prototype.slice.call(arguments)).then(function(e){var n="function"==typeof t.call?t.call(e):t.call;return{call:n,args:e}}).then(function(e){return new Promise(function(t,n){v.provider.send(e,function(e,r){return e?void n(e):void t(r)})})}).catch(function(e){console.error(e)})}})},p=function(e,t){t.forEach(function(t){var r={};r.get=function(){return new Promise(function(e,n){v.provider.send({call:t.getter},function(t,r){return t?void n(t):void e(r)})})},t.setter&&(r.set=function(e){return n([e]).then(function(e){return new Promise(function(n){v.provider.send({call:t.setter,args:e},function(e,t){return e?void reject(e):void n(t)})})}).catch(function(e){console.error(e)})}),Object.defineProperty(e,t.name,r)})},h=function(e){return parseInt(e,16).toString()},d=function(e){return parseInt(e).toString(16)},v={_callbacks:{},_events:{},providers:{},toHex:function(e){for(var t="",n=0;n<e.length;n++){var r=e.charCodeAt(n).toString(16);t+=r.length<2?"0"+r:r}return t},toAscii:function(e){var t="",n=0,r=e.length;for("0x"===e.substring(0,2)&&(n=2);r>n;n+=2){var i=parseInt(e.substr(n,2),16);if(0===i)break;t+=String.fromCharCode(i)}return t},fromAscii:function(e,t){t=void 0===t?0:t;for(var n=this.toHex(e);n.length<2*t;)n+="00";return"0x"+n},toDecimal:function(e){return h(e.substring(2))},fromDecimal:function(e){return"0x"+d(e)},toEth:function(e){for(var t="string"==typeof e?0===e.indexOf("0x")?parseInt(e.substr(2),16):parseInt(e):e,n=0,r=["wei","Kwei","Mwei","Gwei","szabo","finney","ether","grand","Mether","Gether","Tether","Pether","Eether","Zether","Yether","Nether","Dether","Vether","Uether"];t>3e3&&n<r.length-1;)t/=1e3,n++;for(var i=t.toString().length<t.toFixed(2).length?t.toString():t.toFixed(2),o=function(e,t,n){return t+","+n};;){var s=i;if(i=i.replace(/(\d)(\d\d\d[\.\,])/,o),s===i)break}return i+" "+r[n]},eth:{watch:function(e){return new v.filter(e,g)}},db:{},shh:{watch:function(e){return new v.filter(e,m)}},on:function(e,t,n){return void 0===v._events[e]&&(v._events[e]={}),v._events[e][t]=n,this},off:function(e,t){return void 0!==v._events[e]&&delete v._events[e][t],this},trigger:function(e,t,n){var r=v._events[e];if(r&&r[t]){var i=r[t];i(n)}},haveProvider:function(){return!!v.provider.provider}};l(v,i()),l(v.eth,o()),p(v.eth,s()),l(v.db,a()),l(v.shh,u());var g={changed:"eth_changed"};l(g,f());var m={changed:"shh_changed"};l(m,c()),v.setProvider=function(e){e.onmessage=r,v.provider.set(e),v.provider.sendQueued()},t.exports=v},{}],9:[function(e,t){var n=function(e){this.handlers=[],this.queued=[],this.ready=!1,this.ws=new WebSocket(e);var t=this;this.ws.onmessage=function(e){for(var n=0;n<t.handlers.length;n++)t.handlers[n].call(t,JSON.parse(e.data),e)},this.ws.onopen=function(){t.ready=!0;for(var e=0;e<t.queued.length;e++)t.send(t.queued[e])}};n.prototype.send=function(e){if(this.ready){var t=JSON.stringify(e);this.ws.send(t)}else this.queued.push(e)},n.prototype.onMessage=function(e){this.handlers.push(e)},n.prototype.unload=function(){this.ws.close()},Object.defineProperty(n.prototype,"onmessage",{set:function(e){this.onMessage(e)}}),"undefined"!=typeof t&&(t.exports=n)},{}],web3:[function(e,t){var n=e("./lib/web3"),r=e("./lib/providermanager");n.provider=new r,n.filter=e("./lib/filter"),n.providers.WebSocketProvider=e("./lib/websocket"),n.providers.HttpRpcProvider=e("./lib/httprpc"),n.providers.QtProvider=e("./lib/qt"),n.providers.AutoProvider=e("./lib/autoprovider"),n.eth.contract=e("./lib/contract"),t.exports=n},{"./lib/autoprovider":2,"./lib/contract":3,"./lib/filter":4,"./lib/httprpc":5,"./lib/providermanager":6,"./lib/qt":7,"./lib/web3":8,"./lib/websocket":9}]},{},["web3"]);
\ No newline at end of file
diff --git a/example/contract.html b/example/contract.html
index e39370da5..a3f0df176 100644
--- a/example/contract.html
+++ b/example/contract.html
@@ -20,7 +20,7 @@
 
     // contract description, this will be autogenerated somehow
     var desc =  [{
-        "name": "multiply",
+        "name": "multiply(uint256)",
         "inputs": [
         {
             "name": "a",
diff --git a/lib/abi.js b/lib/abi.js
index 72001eaa0..c896ab28a 100644
--- a/lib/abi.js
+++ b/lib/abi.js
@@ -330,15 +330,37 @@ var fromAbiOutput = function (json, methodName, output) {
     return result;
 };
 
+/// @returns display name for method eg. multiply(uint256) -> multiply
+var methodDisplayName = function (method) {
+    var length = method.indexOf('('); 
+    return length !== -1 ? method.substr(0, length) : method;
+};
+
+/// @returns overloaded part of method's name
+var methodTypeName = function (method) {
+    /// TODO: make it not vulnerable
+    var length = method.indexOf('(');
+    return length !== -1 ? method.substr(length + 1, method.length - 1 - (length + 1)) : "";
+};
+
 /// @param json abi for contract
 /// @returns input parser object for given json abi
 var inputParser = function (json) {
     var parser = {};
     json.forEach(function (method) {
-        parser[method.name] = function () {
+        var displayName = methodDisplayName(method.name); 
+        var typeName = methodTypeName(method.name);
+
+        var impl = function () {
             var params = Array.prototype.slice.call(arguments);
             return toAbiInput(json, method.name, params);
         };
+       
+        if (parser[displayName] === undefined) {
+            parser[displayName] = impl;
+        }
+
+        parser[displayName][typeName] = impl;
     });
 
     return parser;
@@ -349,9 +371,19 @@ var inputParser = function (json) {
 var outputParser = function (json) {
     var parser = {};
     json.forEach(function (method) {
-        parser[method.name] = function (output) {
+
+        var displayName = methodDisplayName(method.name); 
+        var typeName = methodTypeName(method.name);
+
+        var impl = function (output) {
             return fromAbiOutput(json, method.name, output);
         };
+
+        if (parser[displayName] === undefined) {
+            parser[displayName] = impl;
+        }
+
+        parser[displayName][typeName] = impl;
     });
 
     return parser;
@@ -361,20 +393,14 @@ var outputParser = function (json) {
 /// @param method name for which we want to get method signature
 /// @returns (promise) contract method signature for method with given name
 var methodSignature = function (json, name) {
-    var method = json[findMethodIndex(json, name)];
-    var result = name + '(';
-    var inputTypes = method.inputs.map(function (inp) {
-        return inp.type;
-    });
-    result += inputTypes.join(',');
-    result += ')';
-
-    return web3.sha3(web3.fromAscii(result));
+    return web3.sha3(web3.fromAscii(name));
 };
 
 module.exports = {
     inputParser: inputParser,
     outputParser: outputParser,
-    methodSignature: methodSignature
+    methodSignature: methodSignature,
+    methodDisplayName: methodDisplayName,
+    methodTypeName: methodTypeName
 };
 
diff --git a/lib/contract.js b/lib/contract.js
index 744fc88a4..2e8ef8ce4 100644
--- a/lib/contract.js
+++ b/lib/contract.js
@@ -53,12 +53,16 @@ var contract = function (address, desc) {
     var contract = {};
 
     desc.forEach(function (method) {
-        contract[method.name] = function () {
+
+        var displayName = abi.methodDisplayName(method.name);
+        var typeName = abi.methodTypeName(method.name);
+
+        var impl = function () {
             var params = Array.prototype.slice.call(arguments);
-            var parsed = inputParser[method.name].apply(null, params);
+            var parsed = inputParser[displayName][typeName].apply(null, params);
 
             var onSuccess = function (result) {
-                return outputParser[method.name](result);
+                return outputParser[displayName][typeName](result);
             };
 
             return {
@@ -80,6 +84,12 @@ var contract = function (address, desc) {
                 }
             };
         };
+
+        if (contract[displayName] === undefined) {
+            contract[displayName] = impl;
+        }
+
+        contract[displayName][typeName] = impl;
     });
 
     return contract;
diff --git a/test/abi.parsers.js b/test/abi.parsers.js
index e9613817b..19fa1d4cf 100644
--- a/test/abi.parsers.js
+++ b/test/abi.parsers.js
@@ -48,7 +48,6 @@ describe('abi', function() {
             assert.equal(parser.test('0.1'), "0000000000000000000000000000000000000000000000000000000000000000");
             assert.equal(parser.test('3.9'), "0000000000000000000000000000000000000000000000000000000000000003");
 
-
         });
 
         it('should parse input uint128', function() {
@@ -321,7 +320,7 @@ describe('abi', function() {
         
             // given
             var d = clone(description);
-            d[0].name = 'helloworld';
+            d[0].name = 'helloworld(int)';
             d[0].inputs = [
                 { type: "int" }
             ];
@@ -331,6 +330,7 @@ describe('abi', function() {
 
             // then
             assert.equal(parser.helloworld(1), "0000000000000000000000000000000000000000000000000000000000000001");
+            assert.equal(parser.helloworld['int'](1), "0000000000000000000000000000000000000000000000000000000000000001");
 
         });
         
@@ -755,7 +755,7 @@ describe('abi', function() {
         
             // given
             var d = clone(description);
-            d[0].name = 'helloworld';
+            d[0].name = 'helloworld(int)';
             d[0].outputs = [
                 { type: "int" }
             ];
@@ -765,6 +765,7 @@ describe('abi', function() {
 
             // then
             assert.equal(parser.helloworld("0x0000000000000000000000000000000000000000000000000000000000000001")[0], 1);
+            assert.equal(parser.helloworld['int']("0x0000000000000000000000000000000000000000000000000000000000000001")[0], 1);
 
         });