diff --git a/e2e-commons/constants.json b/e2e-commons/constants.json
index ae28c339..9f5c8334 100644
--- a/e2e-commons/constants.json
+++ b/e2e-commons/constants.json
@@ -7,10 +7,26 @@
     "address": "0xcca2fb44C8C36E51f743269d6F484Fd027B9F9Aa",
     "privateKey": "0xcf954e07e6a439faf392eb474e95ddb444c2ca444847f2ad6ecc79e1a585e2b8"
   },
+  "thirdUser": {
+    "address": "0x441cc8537aB6cE63d060b63F3A44eE021d62e6cF",
+    "privateKey": "0xd3915199f27691d7784cb01ab0c7220308053b229f95d592e97493326314a8d0"
+  },
+  "fourthUser": {
+    "address": "0x3CC5baAB679eC0732C175760079Bf48F564ad26B",
+    "privateKey": "0xedb53ee050631b7914d5f1a66c2f0d2df3ec85a9ed2a9616b16a7b1b7a10b8d1"
+  },
   "validator": {
     "address": "0xaaB52d66283F7A1D5978bcFcB55721ACB467384b",
     "privateKey": "0x8e829f695aed89a154550f30262f1529582cc49dc30eff74a6b491359e0230f9"
   },
+  "secondValidator": {
+    "address": "0xdCC784657C78054aa61FbcFFd2605F32374816A4",
+    "privateKey": "0x5a5c3645d0f04e9eb4f27f94ed4c244a225587405b8838e7456f7781ce3a9513"
+  },
+  "thirdValidator": {
+    "address": "0xDcef88209a20D52165230104B245803C3269454d",
+    "privateKey": "0xf877f62a1c19f852cff1d29f0fb1ecac18821c0080d4cc0520c60c098293dca1"
+  },
   "blockGenerator": {
     "address": "0xB4579fd5AfEaB60B03Db3F408AAdD315035943f7",
     "privateKey": "0xd6143d390d8b28c33601bb0fe29392fb1c35c24ccfe8722c09c2bdd6ada2699f"
diff --git a/e2e-commons/contracts-envs/amb.env b/e2e-commons/contracts-envs/amb.env
index 9335c504..e575f0b5 100644
--- a/e2e-commons/contracts-envs/amb.env
+++ b/e2e-commons/contracts-envs/amb.env
@@ -22,4 +22,4 @@ FOREIGN_REQUIRED_BLOCK_CONFIRMATIONS=1
 FOREIGN_GAS_PRICE=10000000000
 
 REQUIRED_NUMBER_OF_VALIDATORS=1
-VALIDATORS=0xaaB52d66283F7A1D5978bcFcB55721ACB467384b
+VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b 0xdCC784657C78054aa61FbcFFd2605F32374816A4 0xDcef88209a20D52165230104B245803C3269454d"
diff --git a/e2e-commons/contracts-envs/erc-to-erc.env b/e2e-commons/contracts-envs/erc-to-erc.env
index f1f4daa8..1c9a2004 100644
--- a/e2e-commons/contracts-envs/erc-to-erc.env
+++ b/e2e-commons/contracts-envs/erc-to-erc.env
@@ -34,8 +34,7 @@ FOREIGN_REWARDABLE=false
 ERC20_TOKEN_ADDRESS=0x3C665A31199694Bf723fD08844AD290207B5797f
 
 REQUIRED_NUMBER_OF_VALIDATORS=1
-VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b"
-VALIDATORS_REWARD_ACCOUNTS=0x0000000000000000000000000000000000000000
+VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b 0xdCC784657C78054aa61FbcFFd2605F32374816A4 0xDcef88209a20D52165230104B245803C3269454d"
 BLOCK_REWARD_ADDRESS=0x0000000000000000000000000000000000000000
 DPOS_STAKING_ADDRESS=0x0000000000000000000000000000000000000000
 ERC20_EXTENDED_BY_ERC677=false
diff --git a/e2e-commons/contracts-envs/erc-to-native.env b/e2e-commons/contracts-envs/erc-to-native.env
index f7991673..8a7ccac7 100644
--- a/e2e-commons/contracts-envs/erc-to-native.env
+++ b/e2e-commons/contracts-envs/erc-to-native.env
@@ -35,5 +35,4 @@ BLOCK_REWARD_ADDRESS=0xF9698Eb93702dfdd0e2d802088d4c21822a8A977
 ERC20_TOKEN_ADDRESS=0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359
 
 REQUIRED_NUMBER_OF_VALIDATORS=1
-VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b"
-VALIDATORS_REWARD_ACCOUNTS=0x0000000000000000000000000000000000000000
+VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b 0xdCC784657C78054aa61FbcFFd2605F32374816A4 0xDcef88209a20D52165230104B245803C3269454d"
diff --git a/e2e-commons/contracts-envs/native-to-erc.env b/e2e-commons/contracts-envs/native-to-erc.env
index 7e16f2c7..6620aa46 100644
--- a/e2e-commons/contracts-envs/native-to-erc.env
+++ b/e2e-commons/contracts-envs/native-to-erc.env
@@ -34,6 +34,5 @@ FOREIGN_GAS_PRICE=10000000000
 FOREIGN_REWARDABLE=false
 
 REQUIRED_NUMBER_OF_VALIDATORS=1
-VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b"
-VALIDATORS_REWARD_ACCOUNTS=0x0000000000000000000000000000000000000000
+VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b 0xdCC784657C78054aa61FbcFFd2605F32374816A4 0xDcef88209a20D52165230104B245803C3269454d"
 BLOCK_REWARD_ADDRESS=0x0000000000000000000000000000000000000000
diff --git a/e2e-commons/docker-compose.yml b/e2e-commons/docker-compose.yml
index 722af57c..693e067f 100644
--- a/e2e-commons/docker-compose.yml
+++ b/e2e-commons/docker-compose.yml
@@ -24,8 +24,6 @@ services:
       - ultimate
   rabbit:
     image: "rabbitmq:3-management"
-    ports:
-    - "15672:15672"
     networks:
       - ultimate
   oracle:
diff --git a/e2e-commons/down.sh b/e2e-commons/down.sh
index 06e846fe..8eef3155 100755
--- a/e2e-commons/down.sh
+++ b/e2e-commons/down.sh
@@ -5,4 +5,6 @@ if [ $CI ]; then exit $rc; fi
 
 ps | grep node | grep -v grep | awk '{print "kill " $1}' | /bin/bash
 docker-compose down
+docker-compose -p validator2 down
+docker-compose -p validator3 down
 docker network rm ultimate || true
diff --git a/e2e-commons/up.sh b/e2e-commons/up.sh
index 5a8053b3..b7554dbf 100755
--- a/e2e-commons/up.sh
+++ b/e2e-commons/up.sh
@@ -7,6 +7,29 @@ docker-compose build
 docker network create --driver bridge ultimate || true
 docker-compose up -d parity1 parity2 e2e
 
+startValidator () {
+    docker-compose $1 run -d --name $4 redis
+    docker-compose $1 run -d --name $5 rabbit
+    docker-compose $1 run $2 $3 -d oracle yarn watcher:signature-request
+    docker-compose $1 run $2 $3 -d oracle yarn watcher:collected-signatures
+    docker-compose $1 run $2 $3 -d oracle yarn watcher:affirmation-request
+    docker-compose $1 run $2 $3 -d oracle-erc20 yarn watcher:signature-request
+    docker-compose $1 run $2 $3 -d oracle-erc20 yarn watcher:collected-signatures
+    docker-compose $1 run $2 $3 -d oracle-erc20 yarn watcher:affirmation-request
+    docker-compose $1 run $2 $3 -d oracle-erc20 yarn watcher:transfer
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn watcher:signature-request
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn watcher:collected-signatures
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn watcher:affirmation-request
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn watcher:transfer
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn watcher:half-duplex-transfer
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn worker:swap-tokens
+    docker-compose $1 run $2 $3 -d oracle-amb yarn watcher:signature-request
+    docker-compose $1 run $2 $3 -d oracle-amb yarn watcher:collected-signatures
+    docker-compose $1 run $2 $3 -d oracle-amb yarn watcher:affirmation-request
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn sender:home
+    docker-compose $1 run $2 $3 -d oracle-erc20-native yarn sender:foreign
+}
+
 while [ "$1" != "" ]; do
   if [ "$1" == "oracle" ]; then
     docker-compose up -d redis rabbit oracle oracle-erc20 oracle-erc20-native oracle-amb
@@ -31,6 +54,20 @@ while [ "$1" != "" ]; do
     docker-compose run -d oracle yarn sender:foreign
   fi
 
+  if [ "$1" == "oracle-validator-2" ]; then
+    oracle2name="-p validator2"
+    oracle2Values="-e ORACLE_VALIDATOR_ADDRESS=0xdCC784657C78054aa61FbcFFd2605F32374816A4 -e ORACLE_VALIDATOR_ADDRESS_PRIVATE_KEY=5a5c3645d0f04e9eb4f27f94ed4c244a225587405b8838e7456f7781ce3a9513"
+    oracle2comp="-e ORACLE_QUEUE_URL=amqp://rabbit2 -e ORACLE_REDIS_URL=redis://redis2"
+    startValidator "$oracle2name" "$oracle2Values" "$oracle2comp" "redis2" "rabbit2"
+  fi
+
+  if [ "$1" == "oracle-validator-3" ]; then
+    oracle3name="-p validator3"
+    oracle3Values="-e ORACLE_VALIDATOR_ADDRESS=0xDcef88209a20D52165230104B245803C3269454d -e ORACLE_VALIDATOR_ADDRESS_PRIVATE_KEY=f877f62a1c19f852cff1d29f0fb1ecac18821c0080d4cc0520c60c098293dca1"
+    oracle3comp="-e ORACLE_QUEUE_URL=amqp://rabbit3 -e ORACLE_REDIS_URL=redis://redis3"
+    startValidator "$oracle3name" "$oracle3Values" "$oracle3comp" "redis3" "rabbit3"
+  fi
+
   if [ "$1" == "ui" ]; then
     docker-compose up -d ui ui-erc20 ui-erc20-native
 
diff --git a/oracle-e2e/run-tests.sh b/oracle-e2e/run-tests.sh
index 74599c37..a2aba6c6 100755
--- a/oracle-e2e/run-tests.sh
+++ b/oracle-e2e/run-tests.sh
@@ -1,6 +1,6 @@
 cd $(dirname $0)
 
-../e2e-commons/up.sh deploy oracle
+../e2e-commons/up.sh deploy oracle oracle-validator-2 oracle-validator-3
 
 docker-compose -f ../e2e-commons/docker-compose.yml run e2e yarn workspace oracle-e2e run start
 rc=$?
diff --git a/oracle-e2e/test/amb.js b/oracle-e2e/test/amb.js
index 351c4b96..d3b27da2 100644
--- a/oracle-e2e/test/amb.js
+++ b/oracle-e2e/test/amb.js
@@ -1,22 +1,53 @@
 const Web3 = require('web3')
 const assert = require('assert')
 const promiseRetry = require('promise-retry')
-const { user, homeRPC, foreignRPC, amb } = require('../../e2e-commons/constants.json')
+const { user, homeRPC, foreignRPC, amb, validator } = require('../../e2e-commons/constants.json')
 const { generateNewBlock } = require('../../e2e-commons/utils')
-const { BOX_ABI } = require('../../commons')
+const { BOX_ABI, HOME_AMB_ABI, FOREIGN_AMB_ABI } = require('../../commons')
+const { setRequiredSignatures } = require('./utils')
 
 const { toBN } = Web3.utils
 
 const homeWeb3 = new Web3(new Web3.providers.HttpProvider(homeRPC.URL))
 const foreignWeb3 = new Web3(new Web3.providers.HttpProvider(foreignRPC.URL))
 
+const COMMON_HOME_BRIDGE_ADDRESS = amb.home
+const COMMON_FOREIGN_BRIDGE_ADDRESS = amb.foreign
+
 homeWeb3.eth.accounts.wallet.add(user.privateKey)
+homeWeb3.eth.accounts.wallet.add(validator.privateKey)
 foreignWeb3.eth.accounts.wallet.add(user.privateKey)
+foreignWeb3.eth.accounts.wallet.add(validator.privateKey)
 
 const homeBox = new homeWeb3.eth.Contract(BOX_ABI, amb.homeBox)
 const foreignBox = new foreignWeb3.eth.Contract(BOX_ABI, amb.foreignBox)
+const homeBridge = new homeWeb3.eth.Contract(HOME_AMB_ABI, COMMON_HOME_BRIDGE_ADDRESS)
+const foreignBridge = new foreignWeb3.eth.Contract(FOREIGN_AMB_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
 
 describe('arbitrary message bridging', () => {
+  before(async () => {
+    // Set 2 required signatures for home bridge
+    await setRequiredSignatures({
+      bridgeContract: homeBridge,
+      web3: homeWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+
+    // Set 2 required signatures for foreign bridge
+    await setRequiredSignatures({
+      bridgeContract: foreignBridge,
+      web3: foreignWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+  })
   describe('Home to Foreign', () => {
     describe('Subsidized Mode', () => {
       it('should bridge message', async () => {
@@ -59,6 +90,7 @@ describe('arbitrary message bridging', () => {
 
         // check that value changed and balance decreased
         await promiseRetry(async retry => {
+          await generateNewBlock(homeWeb3, user.address)
           const value = await foreignBox.methods.value().call()
           if (!toBN(value).eq(toBN(newValue))) {
             retry()
diff --git a/oracle-e2e/test/ercToErc.js b/oracle-e2e/test/ercToErc.js
index ef155bf8..2fa01273 100644
--- a/oracle-e2e/test/ercToErc.js
+++ b/oracle-e2e/test/ercToErc.js
@@ -1,9 +1,10 @@
 const Web3 = require('web3')
 const assert = require('assert')
 const promiseRetry = require('promise-retry')
-const { user, secondUser, ercToErcBridge, homeRPC, foreignRPC } = require('../../e2e-commons/constants.json')
-const { ERC677_BRIDGE_TOKEN_ABI, FOREIGN_ERC_TO_NATIVE_ABI } = require('../../commons')
+const { user, secondUser, ercToErcBridge, homeRPC, foreignRPC, validator } = require('../../e2e-commons/constants.json')
+const { ERC677_BRIDGE_TOKEN_ABI, FOREIGN_ERC_TO_NATIVE_ABI, HOME_ERC_TO_ERC_ABI } = require('../../commons')
 const { generateNewBlock } = require('../../e2e-commons/utils')
+const { setRequiredSignatures } = require('./utils')
 
 const homeWeb3 = new Web3(new Web3.providers.HttpProvider(homeRPC.URL))
 const foreignWeb3 = new Web3(new Web3.providers.HttpProvider(foreignRPC.URL))
@@ -14,13 +15,39 @@ const COMMON_FOREIGN_BRIDGE_ADDRESS = ercToErcBridge.foreign
 const { toBN } = foreignWeb3.utils
 
 homeWeb3.eth.accounts.wallet.add(user.privateKey)
+homeWeb3.eth.accounts.wallet.add(validator.privateKey)
 foreignWeb3.eth.accounts.wallet.add(user.privateKey)
+foreignWeb3.eth.accounts.wallet.add(validator.privateKey)
 
 const erc20Token = new foreignWeb3.eth.Contract(ERC677_BRIDGE_TOKEN_ABI, ercToErcBridge.foreignToken)
 const foreignBridge = new foreignWeb3.eth.Contract(FOREIGN_ERC_TO_NATIVE_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
 const erc677Token = new homeWeb3.eth.Contract(ERC677_BRIDGE_TOKEN_ABI, ercToErcBridge.homeToken)
+const homeBridge = new homeWeb3.eth.Contract(HOME_ERC_TO_ERC_ABI, COMMON_HOME_BRIDGE_ADDRESS)
 
 describe('erc to erc', () => {
+  before(async () => {
+    // Set 2 required signatures for home bridge
+    await setRequiredSignatures({
+      bridgeContract: homeBridge,
+      web3: homeWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+
+    // Set 2 required signatures for foreign bridge
+    await setRequiredSignatures({
+      bridgeContract: foreignBridge,
+      web3: foreignWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+  })
   it('should convert tokens in foreign to tokens in home', async () => {
     const balance = await erc20Token.methods.balanceOf(user.address).call()
     assert(!toBN(balance).isZero(), 'Account should have tokens')
@@ -132,6 +159,7 @@ describe('erc to erc', () => {
 
     // check that balance increases
     await promiseRetry(async retry => {
+      await generateNewBlock(homeWeb3, user.address)
       const balance = await erc20Token.methods.balanceOf(user.address).call()
       if (toBN(balance).lte(toBN(originalBalance))) {
         retry()
diff --git a/oracle-e2e/test/ercToNative.js b/oracle-e2e/test/ercToNative.js
index ba474693..b1c925e4 100644
--- a/oracle-e2e/test/ercToNative.js
+++ b/oracle-e2e/test/ercToNative.js
@@ -9,8 +9,9 @@ const {
   homeRPC,
   foreignRPC
 } = require('../../e2e-commons/constants.json')
-const { ERC677_BRIDGE_TOKEN_ABI, FOREIGN_ERC_TO_NATIVE_ABI, SAI_TOP } = require('../../commons')
+const { ERC677_BRIDGE_TOKEN_ABI, FOREIGN_ERC_TO_NATIVE_ABI, SAI_TOP, HOME_ERC_TO_NATIVE_ABI } = require('../../commons')
 const { generateNewBlock } = require('../../e2e-commons/utils')
+const { setRequiredSignatures } = require('./utils')
 
 const homeWeb3 = new Web3(new Web3.providers.HttpProvider(homeRPC.URL))
 const foreignWeb3 = new Web3(new Web3.providers.HttpProvider(foreignRPC.URL))
@@ -21,11 +22,13 @@ const COMMON_FOREIGN_BRIDGE_ADDRESS = ercToNativeBridge.foreign
 const { toBN } = foreignWeb3.utils
 
 homeWeb3.eth.accounts.wallet.add(user.privateKey)
+homeWeb3.eth.accounts.wallet.add(validator.privateKey)
 foreignWeb3.eth.accounts.wallet.add(user.privateKey)
 foreignWeb3.eth.accounts.wallet.add(validator.privateKey)
 
 const erc20Token = new foreignWeb3.eth.Contract(ERC677_BRIDGE_TOKEN_ABI, ercToNativeBridge.foreignToken)
 const foreignBridge = new foreignWeb3.eth.Contract(FOREIGN_ERC_TO_NATIVE_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
+const homeBridge = new homeWeb3.eth.Contract(HOME_ERC_TO_NATIVE_ABI, COMMON_HOME_BRIDGE_ADDRESS)
 
 describe('erc to native', () => {
   let halfDuplexTokenAddress
@@ -33,6 +36,28 @@ describe('erc to native', () => {
   before(async () => {
     halfDuplexTokenAddress = await foreignBridge.methods.halfDuplexErc20token().call()
     halfDuplexToken = new foreignWeb3.eth.Contract(ERC677_BRIDGE_TOKEN_ABI, halfDuplexTokenAddress)
+
+    // Set 2 required signatures for home bridge
+    await setRequiredSignatures({
+      bridgeContract: homeBridge,
+      web3: homeWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+
+    // Set 2 required signatures for foreign bridge
+    await setRequiredSignatures({
+      bridgeContract: foreignBridge,
+      web3: foreignWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
   })
   it('should continue working after migration', async () => {
     const originalBalanceOnHome = await homeWeb3.eth.getBalance(user.address)
@@ -81,7 +106,7 @@ describe('erc to native', () => {
     })
 
     // update min threshold for swap
-    await foreignBridge.methods.setMinHDTokenBalance(foreignWeb3.utils.toWei('1', 'ether')).send({
+    await foreignBridge.methods.setMinHDTokenBalance(foreignWeb3.utils.toWei('2', 'ether')).send({
       from: validator.address,
       gas: '1000000'
     })
@@ -494,6 +519,7 @@ describe('erc to native', () => {
 
     // check that balance increases
     await promiseRetry(async retry => {
+      await generateNewBlock(homeWeb3, user.address)
       const balance = await erc20Token.methods.balanceOf(user.address).call()
       if (toBN(balance).lte(toBN(originalBalance))) {
         retry()
diff --git a/oracle-e2e/test/mocha.opts b/oracle-e2e/test/mocha.opts
index 9be9f564..4effd056 100644
--- a/oracle-e2e/test/mocha.opts
+++ b/oracle-e2e/test/mocha.opts
@@ -1 +1 @@
---timeout 30000
+--timeout 120000
diff --git a/oracle-e2e/test/nativeToErc.js b/oracle-e2e/test/nativeToErc.js
index ab1d9e3c..bc07fa31 100644
--- a/oracle-e2e/test/nativeToErc.js
+++ b/oracle-e2e/test/nativeToErc.js
@@ -4,13 +4,18 @@ const promiseRetry = require('promise-retry')
 const {
   user,
   validator,
+  secondValidator,
+  thirdValidator,
   nativeToErcBridge,
   secondUser,
+  thirdUser,
+  fourthUser,
   homeRPC,
   foreignRPC
 } = require('../../e2e-commons/constants.json')
-const { ERC677_BRIDGE_TOKEN_ABI } = require('../../commons')
+const { ERC677_BRIDGE_TOKEN_ABI, HOME_NATIVE_TO_ERC_ABI, FOREIGN_NATIVE_TO_ERC_ABI } = require('../../commons')
 const { generateNewBlock } = require('../../e2e-commons/utils')
+const { setRequiredSignatures } = require('./utils')
 
 const homeWeb3 = new Web3(new Web3.providers.HttpProvider(homeRPC.URL))
 const foreignWeb3 = new Web3(new Web3.providers.HttpProvider(foreignRPC.URL))
@@ -22,15 +27,48 @@ const COMMON_FOREIGN_BRIDGE_ADDRESS = nativeToErcBridge.foreign
 homeWeb3.eth.accounts.wallet.add(user.privateKey)
 homeWeb3.eth.accounts.wallet.add(validator.privateKey)
 homeWeb3.eth.accounts.wallet.add(secondUser.privateKey)
+homeWeb3.eth.accounts.wallet.add(secondValidator.privateKey)
+homeWeb3.eth.accounts.wallet.add(thirdValidator.privateKey)
+homeWeb3.eth.accounts.wallet.add(thirdUser.privateKey)
+homeWeb3.eth.accounts.wallet.add(fourthUser.privateKey)
 foreignWeb3.eth.accounts.wallet.add(user.privateKey)
 foreignWeb3.eth.accounts.wallet.add(validator.privateKey)
 foreignWeb3.eth.accounts.wallet.add(secondUser.privateKey)
+foreignWeb3.eth.accounts.wallet.add(secondValidator.privateKey)
+foreignWeb3.eth.accounts.wallet.add(thirdValidator.privateKey)
+foreignWeb3.eth.accounts.wallet.add(thirdUser.privateKey)
+foreignWeb3.eth.accounts.wallet.add(fourthUser.privateKey)
 
 const token = new foreignWeb3.eth.Contract(ERC677_BRIDGE_TOKEN_ABI, nativeToErcBridge.foreignToken)
+const homeBridge = new homeWeb3.eth.Contract(HOME_NATIVE_TO_ERC_ABI, COMMON_HOME_BRIDGE_ADDRESS)
+const foreignBridge = new foreignWeb3.eth.Contract(FOREIGN_NATIVE_TO_ERC_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
 
 const sleep = timeout => new Promise(res => setTimeout(res, timeout))
 
 describe('native to erc', () => {
+  before(async () => {
+    // Set 2 required signatures for home bridge
+    await setRequiredSignatures({
+      bridgeContract: homeBridge,
+      web3: homeWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+
+    // Set 2 required signatures for foreign bridge
+    await setRequiredSignatures({
+      bridgeContract: foreignBridge,
+      web3: foreignWeb3,
+      requiredSignatures: 2,
+      options: {
+        from: validator.address,
+        gas: '4000000'
+      }
+    })
+  })
   it('should convert eth in home to tokens in foreign', async () => {
     // check that account has zero tokens in the foreign chain
     const balance = await token.methods.balanceOf(user.address).call()
@@ -109,6 +147,8 @@ describe('native to erc', () => {
 
     // empty validator funds
     await sendAllBalance(homeWeb3, validator.address, secondUser.address)
+    await sendAllBalance(homeWeb3, secondValidator.address, thirdUser.address)
+    await sendAllBalance(homeWeb3, thirdValidator.address, fourthUser.address)
 
     // send transaction to home chain
     const depositTx = await homeWeb3.eth.sendTransaction({
@@ -130,14 +170,16 @@ describe('native to erc', () => {
     assert(originalBalance.eq(balance), "Token balance shouldn't have changed")
 
     // send funds back to validator
-    const sendBalanceBackTx = await sendAllBalance(homeWeb3, secondUser.address, validator.address)
+    await sendAllBalance(homeWeb3, secondUser.address, validator.address)
+    await sendAllBalance(homeWeb3, thirdUser.address, secondValidator.address)
+    const sendBalanceBackTx = await sendAllBalance(homeWeb3, fourthUser.address, thirdValidator.address)
 
     // expect Deposit event to be processed
     await promiseRetry(
       async retry => {
         const lastBlockNumber = await homeWeb3.eth.getBlockNumber()
         // check that a new block was created since the last transaction
-        if (lastBlockNumber === sendBalanceBackTx.blockNumber + 1) {
+        if (lastBlockNumber >= sendBalanceBackTx.blockNumber + 1) {
           await generateNewBlock(homeWeb3, user.address)
         } else {
           retry()
@@ -165,6 +207,8 @@ describe('native to erc', () => {
 
     // empty foreign validator funds
     await sendAllBalance(foreignWeb3, validator.address, secondUser.address)
+    await sendAllBalance(foreignWeb3, secondValidator.address, thirdUser.address)
+    await sendAllBalance(foreignWeb3, thirdValidator.address, fourthUser.address)
     const foreignBlockNumber = await foreignWeb3.eth.getBlockNumber()
 
     // send transaction to home chain
@@ -183,7 +227,7 @@ describe('native to erc', () => {
     await promiseRetry(
       async retry => {
         const lastBlockNumber = await homeWeb3.eth.getBlockNumber()
-        if (lastBlockNumber === lastHomeTx.blockNumber + 1) {
+        if (lastBlockNumber >= lastHomeTx.blockNumber + 1) {
           await generateNewBlock(homeWeb3, user.address)
         } else {
           retry()
@@ -203,6 +247,8 @@ describe('native to erc', () => {
 
     // send funds back to validator
     await sendAllBalance(foreignWeb3, secondUser.address, validator.address)
+    await sendAllBalance(foreignWeb3, thirdUser.address, secondValidator.address)
+    await sendAllBalance(foreignWeb3, fourthUser.address, thirdValidator.address)
 
     // check that account has tokens in the foreign chain
     await promiseRetry(async retry => {
diff --git a/oracle-e2e/test/utils.js b/oracle-e2e/test/utils.js
new file mode 100644
index 00000000..f1b85de0
--- /dev/null
+++ b/oracle-e2e/test/utils.js
@@ -0,0 +1,12 @@
+const { BRIDGE_VALIDATORS_ABI } = require('../../commons')
+
+const setRequiredSignatures = async ({ bridgeContract, web3, requiredSignatures, options }) => {
+  const validatorAddress = await bridgeContract.methods.validatorContract().call()
+  const validatorContract = new web3.eth.Contract(BRIDGE_VALIDATORS_ABI, validatorAddress)
+
+  return validatorContract.methods.setRequiredSignatures(requiredSignatures).send(options)
+}
+
+module.exports = {
+  setRequiredSignatures
+}
diff --git a/parity/chain-foreign.json b/parity/chain-foreign.json
index 67f2cc60..a3c8ac88 100644
--- a/parity/chain-foreign.json
+++ b/parity/chain-foreign.json
@@ -79,6 +79,12 @@
     "aaB52d66283F7A1D5978bcFcB55721ACB467384b": {
       "balance": "1606938044258990275541962092341162602522202993782792835301376"
     },
+    "dCC784657C78054aa61FbcFFd2605F32374816A4": {
+      "balance": "1606938044258990275541962092341162602522202993782792835301376"
+    },
+    "Dcef88209a20D52165230104B245803C3269454d": {
+      "balance": "1606938044258990275541962092341162602522202993782792835301376"
+    },
     "bb140FbA6242a1c3887A7823F7750a73101383e3": {
       "balance": "1606938044258990275541962092341162602522202993782792835301376"
     },
diff --git a/parity/chain.json b/parity/chain.json
index 586321e3..ee1b205e 100644
--- a/parity/chain.json
+++ b/parity/chain.json
@@ -46,6 +46,8 @@
 		"0000000000000000000000000000000000000008": { "balance": "1", "builtin": { "name": "alt_bn128_pairing", "activate_at": 0, "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } },
 		"0000000000000000000000000000000000001337": { "balance": "1", "constructor": "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