diff --git a/common/config/contracts/etc.json b/common/config/contracts/etc.json
index 59a14651..ccfb3343 100644
--- a/common/config/contracts/etc.json
+++ b/common/config/contracts/etc.json
@@ -11,7 +11,6 @@
   },
   {
     "name": "Mist's Multisig Contract",
-    "address": "0x0000000000000000000000000000000000000000",
     "abi": "[{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"removeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_addr\",\"type\":\"address\"}],\"name\":\"isOwner\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_numOwners\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_lastDay\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"resetSpentToday\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_spentToday\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"addOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_required\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_h\",\"type\":\"bytes32\"}],\"name\":\"confirm\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newLimit\",\"type\":\"uint256\"}],\"name\":\"setDailyLimit\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"},{\"name\":\"_data\",\"type\":\"bytes\"}],\"name\":\"execute\",\"outputs\":[{\"name\":\"_r\",\"type\":\"bytes32\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"}],\"name\":\"revoke\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newRequired\",\"type\":\"uint256\"}],\"name\":\"changeRequirement\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"},{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"hasConfirmed\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"kill\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_from\",\"type\":\"address\"},{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"changeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_dailyLimit\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"inputs\":[{\"name\":\"_owners\",\"type\":\"address[]\"},{\"name\":\"_required\",\"type\":\"uint256\"},{\"name\":\"_daylimit\",\"type\":\"uint256\"}],\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Confirmation\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Revoke\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerAdded\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"}],\"name\":\"OwnerRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newRequirement\",\"type\":\"uint256\"}],\"name\":\"RequirementChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"from\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"SingleTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"MultiTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"initiator\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"ConfirmationNeeded\",\"type\":\"event\"}]"
   }
 ]
diff --git a/common/config/contracts/eth.json b/common/config/contracts/eth.json
index fe4f0e35..9789ab1a 100644
--- a/common/config/contracts/eth.json
+++ b/common/config/contracts/eth.json
@@ -66,7 +66,6 @@
   },
   {
     "name": "Mist's Multisig Contract",
-    "address": "0x0101010101010101010101010101010101010101",
     "abi": "[{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"removeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_addr\",\"type\":\"address\"}],\"name\":\"isOwner\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_numOwners\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_lastDay\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"resetSpentToday\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_spentToday\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"addOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_required\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_h\",\"type\":\"bytes32\"}],\"name\":\"confirm\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newLimit\",\"type\":\"uint256\"}],\"name\":\"setDailyLimit\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"},{\"name\":\"_data\",\"type\":\"bytes\"}],\"name\":\"execute\",\"outputs\":[{\"name\":\"_r\",\"type\":\"bytes32\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"}],\"name\":\"revoke\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newRequired\",\"type\":\"uint256\"}],\"name\":\"changeRequirement\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"},{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"hasConfirmed\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"kill\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_from\",\"type\":\"address\"},{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"changeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_dailyLimit\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"inputs\":[{\"name\":\"_owners\",\"type\":\"address[]\"},{\"name\":\"_required\",\"type\":\"uint256\"},{\"name\":\"_daylimit\",\"type\":\"uint256\"}],\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Confirmation\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Revoke\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerAdded\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"}],\"name\":\"OwnerRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newRequirement\",\"type\":\"uint256\"}],\"name\":\"RequirementChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"from\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"SingleTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"MultiTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"initiator\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"ConfirmationNeeded\",\"type\":\"event\"}]"
   },
   {
diff --git a/common/config/contracts/index.ts b/common/config/contracts/index.ts
index 5ebcdedc..95054404 100644
--- a/common/config/contracts/index.ts
+++ b/common/config/contracts/index.ts
@@ -1,11 +1,17 @@
-import ETC from './ETC.json';
-import ETH from './ETH.json';
-import Rinkeby from './Rinkeby.json';
-import Ropsten from './Ropsten.json';
+import ETC from './etc.json';
+import ETH from './eth.json';
+import EXP from './exp.json';
+import Rinkeby from './rinkeby.json';
+import Ropsten from './ropsten.json';
+import RSK from './rsk.json';
+import UBQ from './ubq.json';
 
 export default {
   ETC,
   ETH,
+  EXP,
   Rinkeby,
-  Ropsten
+  Ropsten,
+  RSK,
+  UBQ
 };
diff --git a/common/config/contracts/ropsten.json b/common/config/contracts/ropsten.json
index 7b8f6da5..798eb1fd 100644
--- a/common/config/contracts/ropsten.json
+++ b/common/config/contracts/ropsten.json
@@ -21,7 +21,6 @@
   },
   {
     "name": "Mist's Multisig Contract",
-    "address": "0x0000000000000000000000000000000000000000",
     "abi": "[{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"removeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_addr\",\"type\":\"address\"}],\"name\":\"isOwner\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_numOwners\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_lastDay\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"resetSpentToday\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_spentToday\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"addOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_required\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_h\",\"type\":\"bytes32\"}],\"name\":\"confirm\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newLimit\",\"type\":\"uint256\"}],\"name\":\"setDailyLimit\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"},{\"name\":\"_data\",\"type\":\"bytes\"}],\"name\":\"execute\",\"outputs\":[{\"name\":\"_r\",\"type\":\"bytes32\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"}],\"name\":\"revoke\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_newRequired\",\"type\":\"uint256\"}],\"name\":\"changeRequirement\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_operation\",\"type\":\"bytes32\"},{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"hasConfirmed\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"kill\",\"outputs\":[],\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_from\",\"type\":\"address\"},{\"name\":\"_to\",\"type\":\"address\"}],\"name\":\"changeOwner\",\"outputs\":[],\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"m_dailyLimit\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"type\":\"function\"},{\"inputs\":[{\"name\":\"_owners\",\"type\":\"address[]\"},{\"name\":\"_required\",\"type\":\"uint256\"},{\"name\":\"_daylimit\",\"type\":\"uint256\"}],\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Confirmation\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"}],\"name\":\"Revoke\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnerAdded\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"oldOwner\",\"type\":\"address\"}],\"name\":\"OwnerRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newRequirement\",\"type\":\"uint256\"}],\"name\":\"RequirementChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"from\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"SingleTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"MultiTransact\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"operation\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"initiator\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"ConfirmationNeeded\",\"type\":\"event\"}]"
   }
 ]
diff --git a/common/config/data.ts b/common/config/data.ts
index 774bf6c6..56c8a7c9 100644
--- a/common/config/data.ts
+++ b/common/config/data.ts
@@ -67,7 +67,7 @@ export interface Token {
 
 export interface NetworkContract {
   name: string;
-  address: string;
+  address?: string;
   abi: string;
 }
 
diff --git a/common/config/tokens/index.ts b/common/config/tokens/index.ts
new file mode 100644
index 00000000..27c8a518
--- /dev/null
+++ b/common/config/tokens/index.ts
@@ -0,0 +1,19 @@
+import ETC from './etc.json';
+import ETH from './eth.json';
+import EXP from './exp.json';
+import Kovan from './kovan.json';
+import Rinkeby from './rinkeby.json';
+import Ropsten from './ropsten.json';
+import RSK from './rsk.json';
+import UBQ from './ubq.json';
+
+export default {
+  ETC,
+  ETH,
+  EXP,
+  Kovan,
+  Rinkeby,
+  Ropsten,
+  RSK,
+  UBQ
+};
diff --git a/common/containers/Tabs/Contracts/components/Interact/components/InteractForm/index.tsx b/common/containers/Tabs/Contracts/components/Interact/components/InteractForm/index.tsx
index 5d621f5f..65723922 100644
--- a/common/containers/Tabs/Contracts/components/Interact/components/InteractForm/index.tsx
+++ b/common/containers/Tabs/Contracts/components/Interact/components/InteractForm/index.tsx
@@ -46,9 +46,10 @@ e":"a", "type":"uint256"}], "name":"foo", "outputs": [] }]';
 
       contractOptions = contractOptions.concat(
         contracts.map(contract => {
+          const addr = contract.address ? `(${contract.address.substr(0, 10)}...)` : '';
           return {
-            name: `${contract.name} (${contract.address.substr(0, 10)}...)`,
-            value: contract.address
+            name: `${contract.name} ${addr}`,
+            value: this.makeContractValue(contract)
           };
         })
       );
@@ -122,23 +123,26 @@ e":"a", "type":"uint256"}], "name":"foo", "outputs": [] }]';
     );
   }
 
-  private handleInput = name => (ev: any) => {
+  private handleInput = name => (ev: React.FormEvent<HTMLInputElement | HTMLTextAreaElement>) => {
     this.props.resetState();
-    this.setState({ [name]: ev.target.value });
+    this.setState({ [name]: ev.currentTarget.value });
   };
 
-  private handleSelectContract = (ev: any) => {
+  private handleSelectContract = (ev: React.FormEvent<HTMLSelectElement>) => {
     this.props.resetState();
-    const addr = ev.target.value;
-    const contract = this.props.contracts.reduce((prev, currContract) => {
-      return currContract.address === addr ? currContract : prev;
+    const contract = this.props.contracts.find(currContract => {
+      return this.makeContractValue(currContract) === ev.currentTarget.value;
     });
 
     this.setState({
-      address: contract.address,
-      abiJson: contract.abi
+      address: contract && contract.address ? contract.address : '',
+      abiJson: contract && contract.abi ? contract.abi : ''
     });
   };
+
+  private makeContractValue(contract: NetworkContract) {
+    return `${contract.name}:${contract.address}`;
+  }
 }
 
 const mapStateToProps = (state: AppState) => ({
diff --git a/spec/config/contracts.spec.ts b/spec/config/contracts.spec.ts
new file mode 100644
index 00000000..6cd5eae4
--- /dev/null
+++ b/spec/config/contracts.spec.ts
@@ -0,0 +1,32 @@
+import CONTRACTS from 'config/contracts';
+import { isValidETHAddress } from 'libs/validators';
+
+describe('Contracts JSON', () => {
+  Object.keys(CONTRACTS).forEach(network => {
+    it(`${network} contracts array properly formatted`, () => {
+      const contracts = CONTRACTS[network];
+      const addressCollisionMap = {};
+
+      contracts.forEach(contract => {
+        if (contract.address && !isValidETHAddress(contract.address)) {
+          throw Error(`Contract '${contract.name}' has invalid address '${contract.address}'`);
+        }
+        if (addressCollisionMap[contract.address]) {
+          throw Error(
+            `Contract '${contract.name}' has the same address as ${
+              addressCollisionMap[contract.address]
+            }`
+          );
+        }
+
+        try {
+          JSON.stringify(contract.abi);
+        } catch (err) {
+          throw Error(`Contract '${contract.name}' has invalid JSON ABI`);
+        }
+
+        addressCollisionMap[contract.address] = contract.name;
+      });
+    });
+  });
+});
diff --git a/spec/config/tokens.spec.ts b/spec/config/tokens.spec.ts
new file mode 100644
index 00000000..f9cc9628
--- /dev/null
+++ b/spec/config/tokens.spec.ts
@@ -0,0 +1,40 @@
+import TOKENS from 'config/tokens';
+import { isValidETHAddress } from 'libs/validators';
+
+describe('Tokens JSON', () => {
+  Object.keys(TOKENS).forEach(network => {
+    it(`${network} tokens array properly formatted`, () => {
+      const tokens = TOKENS[network];
+      const addressCollisionMap = {};
+      const symbolCollisionMap = {};
+
+      tokens.forEach(token => {
+        if (!isValidETHAddress(token.address)) {
+          throw Error(`Token ${token.symbol} has invalid contract address '${token.address}'`);
+        }
+        if (addressCollisionMap[token.address]) {
+          throw Error(
+            `Token ${token.symbol} has the same address as ${addressCollisionMap[token.address]}`
+          );
+        }
+        if (symbolCollisionMap[token.symbol]) {
+          throw Error(
+            `Symbol ${token.symbol} is repeated between tokens at ${token.address} and ${
+              symbolCollisionMap[token.symbol]
+            }`
+          );
+        }
+        if (
+          token.decimal < 0 ||
+          token.decimal > 18 ||
+          token.decimal === null ||
+          token.decimal === undefined
+        ) {
+          throw Error(`Token ${token.symbol} has invalid decimal '${token.decimal}'`);
+        }
+        addressCollisionMap[token.address] = token.symbol;
+        symbolCollisionMap[token.symbol] = token.address;
+      });
+    });
+  });
+});