diff --git a/package.json b/package.json
index 2b4ea90861..ae49df4a19 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.1.16",
+  "version": "0.1.19",
   "devDependencies": {
     "gulp": "^3.9.1",
     "lerna": "^2.10.2"
diff --git a/remix-analyzer/package.json b/remix-analyzer/package.json
index 431db4409e..4657b1c5d2 100644
--- a/remix-analyzer/package.json
+++ b/remix-analyzer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-analyzer",
-  "version": "0.3.10",
+  "version": "0.3.13",
   "description": "Remix Analyzer",
   "main": "./index.js",
   "contributors": [
@@ -18,7 +18,7 @@
     }
   ],
   "dependencies": {
-    "remix-lib": "0.4.9"
+    "remix-lib": "0.4.12"
   },
   "scripts": {
     "lint": "standard",
diff --git a/remix-astwalker/package.json b/remix-astwalker/package.json
index db2441b605..6c70ffadbe 100644
--- a/remix-astwalker/package.json
+++ b/remix-astwalker/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-astwalker",
-  "version": "0.0.6",
+  "version": "0.0.9",
   "description": "Remix sub-module for walking through AST",
   "main": "dist/index.js",
   "scripts": {
@@ -34,7 +34,7 @@
   "dependencies": {
     "@types/tape": "^4.2.33",
     "nyc": "^13.3.0",
-    "remix-lib": "0.4.9",
+    "remix-lib": "0.4.12",
     "tape": "^4.10.1",
     "ts-node": "^8.0.3",
     "typescript": "^3.4.3"
diff --git a/remix-debug/package.json b/remix-debug/package.json
index f4218ed566..d7bb1b7a8a 100644
--- a/remix-debug/package.json
+++ b/remix-debug/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-debug",
-  "version": "0.3.11",
+  "version": "0.3.14",
   "description": "Ethereum IDE and tools for the web",
   "contributors": [
     {
@@ -22,7 +22,7 @@
     "ethereumjs-util": "^4.5.0",
     "ethereumjs-vm": "3.0.0",
     "fast-async": "^6.1.2",
-    "remix-lib": "0.4.9",
+    "remix-lib": "0.4.12",
     "web3": "0.20.6"
   },
   "devDependencies": {
diff --git a/remix-lib/package.json b/remix-lib/package.json
index 4760a943ac..b8cc484c58 100644
--- a/remix-lib/package.json
+++ b/remix-lib/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-lib",
-  "version": "0.4.9",
+  "version": "0.4.12",
   "description": "Ethereum IDE and tools for the web",
   "contributors": [
     {
diff --git a/remix-lib/src/execution/execution-context.js b/remix-lib/src/execution/execution-context.js
index 3985978c35..ce6beeb89d 100644
--- a/remix-lib/src/execution/execution-context.js
+++ b/remix-lib/src/execution/execution-context.js
@@ -56,6 +56,24 @@ class StateManagerCommonStorageDump extends StateManager {
       })
     })
   }
+
+  getStateRoot (cb) {
+    let checkpoint = this._checkpointCount
+    this._checkpointCount = 0
+    super.getStateRoot((err, stateRoot) => {
+      this._checkpointCount = checkpoint
+      cb(err, stateRoot)
+    })
+  }
+
+  setStateRoot (stateRoot, cb) {
+    let checkpoint = this._checkpointCount
+    this._checkpointCount = 0
+    super.setStateRoot(stateRoot, (err) => {
+      this._checkpointCount = checkpoint
+      cb(err)
+    })
+  }
 }
 
 function createVm (hardfork) {
@@ -220,20 +238,6 @@ function ExecutionContext () {
     }
   }
 
-  this.checkpointAndCommit = function (cb, checkpointCount) {
-    // due to issue https://github.com/ethereumjs/ethereumjs-vm/issues/567
-    if (this.vm().stateManager._checkpointCount > (checkpointCount || 0)) {
-      return this.vm().stateManager.commit(() => {
-        cb()
-      })
-    }
-    this.vm().stateManager.checkpoint(() => {
-      this.vm().stateManager.commit(() => {
-        cb()
-      })
-    })
-  }
-
   this.currentblockGasLimit = function () {
     return this.blockGasLimit
   }
diff --git a/remix-lib/src/execution/txRunner.js b/remix-lib/src/execution/txRunner.js
index a8911981b8..6816c60db4 100644
--- a/remix-lib/src/execution/txRunner.js
+++ b/remix-lib/src/execution/txRunner.js
@@ -101,59 +101,70 @@ class TxRunner {
       return callback('Invalid account selected')
     }
 
-    var tx = new EthJSTX({
-      timestamp: timestamp,
-      nonce: new BN(account.nonce++),
-      gasPrice: new BN(1),
-      gasLimit: gasLimit,
-      to: to,
-      value: new BN(value, 10),
-      data: Buffer.from(data.slice(2), 'hex')
-    })
-    tx.sign(account.privateKey)
+    executionContext.vm().stateManager.getAccount(Buffer.from(from.replace('0x', ''), 'hex'), (err, res) => {
+      if (err) {
+        callback('Account not found')
+      } else {
+        var tx = new EthJSTX({
+          timestamp: timestamp,
+          nonce: new BN(res.nonce),
+          gasPrice: new BN(1),
+          gasLimit: gasLimit,
+          to: to,
+          value: new BN(value, 10),
+          data: Buffer.from(data.slice(2), 'hex')
+        })
+        tx.sign(account.privateKey)
 
-    const coinbases = ['0x0e9281e9c6a0808672eaba6bd1220e144c9bb07a', '0x8945a1288dc78a6d8952a92c77aee6730b414778', '0x94d76e24f818426ae84aa404140e8d5f60e10e7e']
-    const difficulties = [new BN('69762765929000', 10), new BN('70762765929000', 10), new BN('71762765929000', 10)]
-    var block = new EthJSBlock({
-      header: {
-        timestamp: timestamp || (new Date().getTime() / 1000 | 0),
-        number: self.blockNumber,
-        coinbase: coinbases[self.blockNumber % coinbases.length],
-        difficulty: difficulties[self.blockNumber % difficulties.length],
-        gasLimit: new BN(gasLimit, 10).imuln(2)
-      },
-      transactions: [tx],
-      uncleHeaders: []
+        const coinbases = ['0x0e9281e9c6a0808672eaba6bd1220e144c9bb07a', '0x8945a1288dc78a6d8952a92c77aee6730b414778', '0x94d76e24f818426ae84aa404140e8d5f60e10e7e']
+        const difficulties = [new BN('69762765929000', 10), new BN('70762765929000', 10), new BN('71762765929000', 10)]
+        var block = new EthJSBlock({
+          header: {
+            timestamp: timestamp || (new Date().getTime() / 1000 | 0),
+            number: self.blockNumber,
+            coinbase: coinbases[self.blockNumber % coinbases.length],
+            difficulty: difficulties[self.blockNumber % difficulties.length],
+            gasLimit: new BN(gasLimit, 10).imuln(2)
+          },
+          transactions: [tx],
+          uncleHeaders: []
+        })
+        if (!useCall) {
+          ++self.blockNumber
+          this.runBlockInVm(tx, block, callback)
+        } else {
+          executionContext.vm().stateManager.checkpoint(() => {
+            this.runBlockInVm(tx, block, (err, result) => {
+              executionContext.vm().stateManager.revert(() => {
+                callback(err, result)
+              })
+            })
+          })
+        }
+      }
     })
-    if (!useCall) {
-      ++self.blockNumber
-    } else {
-      executionContext.vm().stateManager.checkpoint(() => { })
-    }
+  }
 
-    executionContext.checkpointAndCommit(() => {
-      executionContext.vm().runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false }, function (err, results) {
-        err = err ? err.message : err
-        if (err) {
-          return callback(err)
-        }
-        let result = results.results[0]
-        if (useCall) {
-          executionContext.vm().stateManager.revert(function () { })
-        }
-        if (result) {
-          result.status = '0x' + result.vm.exception.toString(16)
-        }
+  runBlockInVm (tx, block, callback) {
+    executionContext.vm().runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false }, function (err, results) {
+      err = err ? err.message : err
+      if (err) {
+        return callback(err)
+      }
+      let result = results.results[0]
 
-        executionContext.addBlock(block)
-        executionContext.trackTx('0x' + tx.hash().toString('hex'), block)
+      if (result) {
+        result.status = '0x' + result.vm.exception.toString(16)
+      }
 
-        callback(err, {
-          result: result,
-          transactionHash: ethJSUtil.bufferToHex(Buffer.from(tx.hash()))
-        })
+      executionContext.addBlock(block)
+      executionContext.trackTx('0x' + tx.hash().toString('hex'), block)
+
+      callback(err, {
+        result: result,
+        transactionHash: ethJSUtil.bufferToHex(Buffer.from(tx.hash()))
       })
-    }, 1)
+    })
   }
 
   runInNode (from, to, data, value, gasLimit, useCall, confirmCb, gasEstimationForceSend, promptCb, callback) {
diff --git a/remix-lib/src/universalDapp.js b/remix-lib/src/universalDapp.js
index db8c6d00df..03960f430c 100644
--- a/remix-lib/src/universalDapp.js
+++ b/remix-lib/src/universalDapp.js
@@ -1,5 +1,5 @@
 const async = require('async')
-const { BN, privateToAddress, isValidPrivate, stripHexPrefix } = require('ethereumjs-util')
+const { BN, privateToAddress, isValidPrivate, stripHexPrefix, toChecksumAddress } = require('ethereumjs-util')
 const crypto = require('crypto')
 const { EventEmitter } = require('events')
 
@@ -121,7 +121,7 @@ module.exports = class UniversalDApp {
         })
       })
 
-      this.accounts['0x' + address.toString('hex')] = { privateKey, nonce: 0 }
+      this.accounts[toChecksumAddress('0x' + address.toString('hex'))] = { privateKey, nonce: 0 }
     }
   }
 
diff --git a/remix-lib/src/util.js b/remix-lib/src/util.js
index d0b5ee86ef..04899c29c2 100644
--- a/remix-lib/src/util.js
+++ b/remix-lib/src/util.js
@@ -180,13 +180,23 @@ module.exports = {
     *
     * @return {RegEx}
     */
-  swarmHashExtractionPOC3: function () {
+  swarmHashExtractionPOC31: function () {
     return /a265627a7a72315820([0-9a-f]{64})64736f6c6343([0-9a-f]{6})0032$/
   },
 
+  /**
+    * return a regex which extract the swarmhash from the bytecode, from POC 0.3
+    *
+    * @return {RegEx}
+    */
+  swarmHashExtractionPOC32: function () {
+    return /a265627a7a72305820([0-9a-f]{64})64736f6c6343([0-9a-f]{6})0032$/
+  },
+
   extractSwarmHash: function (value) {
     value = value.replace(this.swarmHashExtraction(), '')
-    value = value.replace(this.swarmHashExtractionPOC3(), '')
+    value = value.replace(this.swarmHashExtractionPOC31(), '')
+    value = value.replace(this.swarmHashExtractionPOC32(), '')
     return value
   },
 
diff --git a/remix-simulator/package.json b/remix-simulator/package.json
index dbad6850c9..dff56aef6c 100644
--- a/remix-simulator/package.json
+++ b/remix-simulator/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-simulator",
-  "version": "0.1.9-alpha.2",
+  "version": "0.1.9-alpha.5",
   "description": "Ethereum IDE and tools for the web",
   "contributors": [
     {
@@ -18,13 +18,14 @@
     "body-parser": "^1.18.2",
     "color-support": "^1.1.3",
     "commander": "^2.19.0",
+    "cors": "^2.8.5",
     "ethereumjs-util": "^5.1.2",
     "ethereumjs-vm": "3.0.0",
     "express": "^4.16.3",
     "express-ws": "^4.0.0",
     "fast-async": "^6.3.7",
     "merge": "^1.2.0",
-    "remix-lib": "0.4.9",
+    "remix-lib": "0.4.12",
     "standard": "^10.0.3",
     "time-stamp": "^2.0.0",
     "web3": "1.0.0-beta.27"
diff --git a/remix-simulator/src/genesis.js b/remix-simulator/src/genesis.js
index 295cb935f4..2d4d7e74ee 100644
--- a/remix-simulator/src/genesis.js
+++ b/remix-simulator/src/genesis.js
@@ -17,10 +17,8 @@ function generateBlock () {
     uncleHeaders: []
   })
 
-  executionContext.checkpointAndCommit(() => {
-    executionContext.vm().runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false }, function () {
-      executionContext.addBlock(block)
-    })
+  executionContext.vm().runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false }, function () {
+    executionContext.addBlock(block)
   })
 }
 
diff --git a/remix-simulator/src/methods/accounts.js b/remix-simulator/src/methods/accounts.js
index a32ab96f53..176cd129c4 100644
--- a/remix-simulator/src/methods/accounts.js
+++ b/remix-simulator/src/methods/accounts.js
@@ -12,19 +12,28 @@ var Accounts = function () {
   this.accountsKeys = {}
 
   executionContext.init({get: () => { return true }})
+}
 
-  for (let _account of this.accountsList) {
-    this.accountsKeys[_account.address.toLowerCase()] = _account.privateKey
-    this.accounts[_account.address.toLowerCase()] = { privateKey: Buffer.from(_account.privateKey.replace('0x', ''), 'hex'), nonce: 0 }
+Accounts.prototype.init = async function () {
+  let setBalance = (account) => {
+    return new Promise((resolve, reject) => {
+      this.accountsKeys[ethJSUtil.toChecksumAddress(account.address)] = account.privateKey
+      this.accounts[ethJSUtil.toChecksumAddress(account.address)] = { privateKey: Buffer.from(account.privateKey.replace('0x', ''), 'hex'), nonce: 0 }
 
-    executionContext.vm().stateManager.getAccount(Buffer.from(_account.address.toLowerCase().replace('0x', ''), 'hex'), (err, account) => {
-      if (err) {
-        throw new Error(err)
-      }
-      var balance = '0x56BC75E2D63100000'
-      account.balance = balance || '0xf00000000000000001'
+      executionContext.vm().stateManager.getAccount(Buffer.from(account.address.toLowerCase().replace('0x', ''), 'hex'), (err, account) => {
+        if (err) {
+          throw new Error(err)
+        }
+        var balance = '0x56BC75E2D63100000'
+        account.balance = balance || '0xf00000000000000001'
+        resolve()
+      })
     })
   }
+
+  for (let _account of this.accountsList) {
+    await setBalance(_account)
+  }
 }
 
 Accounts.prototype.methods = function () {
@@ -36,7 +45,7 @@ Accounts.prototype.methods = function () {
 }
 
 Accounts.prototype.eth_accounts = function (payload, cb) {
-  return cb(null, this.accountsList.map((x) => x.address))
+  return cb(null, this.accountsList.map((x) => ethJSUtil.toChecksumAddress(x.address)))
 }
 
 Accounts.prototype.eth_getBalance = function (payload, cb) {
diff --git a/remix-simulator/src/methods/transactions.js b/remix-simulator/src/methods/transactions.js
index 754b191604..b861fc4b3d 100644
--- a/remix-simulator/src/methods/transactions.js
+++ b/remix-simulator/src/methods/transactions.js
@@ -5,7 +5,9 @@ var ethJSUtil = require('ethereumjs-util')
 var processTx = require('./txProcess.js')
 var BN = ethJSUtil.BN
 
-var Transactions = function (accounts) {
+var Transactions = function () {}
+
+Transactions.prototype.init = function (accounts) {
   this.accounts = accounts
 }
 
@@ -24,6 +26,10 @@ Transactions.prototype.methods = function () {
 }
 
 Transactions.prototype.eth_sendTransaction = function (payload, cb) {
+  // from might be lowercased address (web3)
+  if (payload.params && payload.params.length > 0 && payload.params[0].from) {
+    payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
+  }
   processTx(this.accounts, payload, false, cb)
 }
 
@@ -68,6 +74,10 @@ Transactions.prototype.eth_getCode = function (payload, cb) {
 }
 
 Transactions.prototype.eth_call = function (payload, cb) {
+  // from might be lowercased address (web3)
+  if (payload.params && payload.params.length > 0 && payload.params[0].from) {
+    payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
+  }
   processTx(this.accounts, payload, true, cb)
 }
 
diff --git a/remix-simulator/src/provider.js b/remix-simulator/src/provider.js
index 3778b58876..4c1f9e706a 100644
--- a/remix-simulator/src/provider.js
+++ b/remix-simulator/src/provider.js
@@ -12,18 +12,24 @@ const generateBlock = require('./genesis.js')
 
 var Provider = function (options) {
   this.Accounts = new Accounts()
+  this.Transactions = new Transactions()
 
   this.methods = {}
   this.methods = merge(this.methods, this.Accounts.methods())
   this.methods = merge(this.methods, (new Blocks(options)).methods())
   this.methods = merge(this.methods, (new Misc()).methods())
   this.methods = merge(this.methods, (new Net()).methods())
-  this.methods = merge(this.methods, (new Transactions(this.Accounts.accounts)).methods())
+  this.methods = merge(this.methods, (this.Transactions.methods()))
   this.methods = merge(this.methods, (new Whisper()).methods())
 
   generateBlock()
 }
 
+Provider.prototype.init = async function () {
+  await this.Accounts.init()
+  this.Transactions.init(this.Accounts.accounts)
+}
+
 Provider.prototype.sendAsync = function (payload, callback) {
   log.info('payload method is ', payload.method)
 
diff --git a/remix-simulator/src/server.js b/remix-simulator/src/server.js
index a8d33023c8..92bb43aad9 100644
--- a/remix-simulator/src/server.js
+++ b/remix-simulator/src/server.js
@@ -1,4 +1,5 @@
 const express = require('express')
+const cors = require('cors')
 const bodyParser = require('body-parser')
 const app = express()
 const expressWs = require('express-ws')
@@ -8,11 +9,17 @@ const log = require('./utils/logs.js')
 class Server {
   constructor (options) {
     this.provider = new Provider(options)
+    this.provider.init().then(() => {
+      log('Provider initiated')
+    }).catch((error) => {
+      log(error)
+    })
   }
 
   start (host, port) {
     expressWs(app)
 
+    app.use(cors())
     app.use(bodyParser.urlencoded({extended: true}))
     app.use(bodyParser.json())
 
diff --git a/remix-solidity/package.json b/remix-solidity/package.json
index bf5f0ef6c5..10b2075836 100644
--- a/remix-solidity/package.json
+++ b/remix-solidity/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-solidity",
-  "version": "0.3.12",
+  "version": "0.3.15",
   "description": "Ethereum IDE and tools for the web",
   "contributors": [
     {
@@ -17,7 +17,7 @@
     "ethereumjs-util": "^4.5.0",
     "ethereumjs-vm": "3.0.0",
     "fast-async": "^6.1.2",
-    "remix-lib": "0.4.9",
+    "remix-lib": "0.4.12",
     "solc": "^0.5.0",
     "webworkify": "^1.2.1"
   },
diff --git a/remix-tests/package.json b/remix-tests/package.json
index a0af850c43..3035827d08 100644
--- a/remix-tests/package.json
+++ b/remix-tests/package.json
@@ -1,6 +1,6 @@
 {
   "name": "remix-tests",
-  "version": "0.1.15",
+  "version": "0.1.18",
   "description": "Tests for the Ethereum tool suite Remix",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
@@ -42,9 +42,9 @@
     "change-case": "^3.0.1",
     "colors": "^1.1.2",
     "commander": "^2.13.0",
-    "remix-lib": "0.4.9",
-    "remix-simulator": "0.1.9-alpha.2",
-    "remix-solidity": "0.3.12",
+    "remix-lib": "0.4.12",
+    "remix-simulator": "0.1.9-alpha.5",
+    "remix-solidity": "0.3.15",
     "web3": "1.0.0-beta.36",
     "winston": "^3.0.0"
   },
diff --git a/remix-tests/src/runTestSources.ts b/remix-tests/src/runTestSources.ts
index 4e765434fd..eefa1be9ba 100644
--- a/remix-tests/src/runTestSources.ts
+++ b/remix-tests/src/runTestSources.ts
@@ -10,15 +10,17 @@ import Web3 = require('web3')
 import { Provider } from 'remix-simulator'
 import { FinalResult } from './types'
 
-const createWeb3Provider = function () {
+const createWeb3Provider = async function () {
     let web3 = new Web3()
-    web3.setProvider(new Provider())
+    let provider = new Provider()
+    await provider.init()
+    web3.setProvider(provider)
     return web3
 }
 
-export function runTestSources(contractSources, testCallback, resultCallback, finalCallback, importFileCb, opts) {
+export async function runTestSources(contractSources, testCallback, resultCallback, finalCallback, importFileCb, opts) {
     opts = opts || {}
-    let web3 = opts.web3 || createWeb3Provider()
+    let web3 = opts.web3 || await createWeb3Provider()
     let accounts = opts.accounts || null
     async.waterfall([
         function getAccountList (next) {
diff --git a/remix-tests/tests/testRunner.ts b/remix-tests/tests/testRunner.ts
index 89fc55a408..2bcf256363 100644
--- a/remix-tests/tests/testRunner.ts
+++ b/remix-tests/tests/testRunner.ts
@@ -44,8 +44,9 @@ function deepEqualExcluding(a: any, b: any, excludedKeys: string[]) {
 let accounts: string[]
 let provider = new Provider()
 
-function compileAndDeploy(filename: string, callback: Function) {
+async function compileAndDeploy(filename: string, callback: Function) {
   let web3: Web3 = new Web3()
+  await provider.init()
   web3.setProvider(provider)
   let compilationData: object
   async.waterfall([