diff --git a/.prettierrc b/.prettierrc
index bbaef00..8904e0d 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,7 +1,8 @@
 {
   "parser": "typescript",
-  "printWidth": 80,
+  "printWidth": 100,
   "singleQuote": true,
+  "bracketSpacing": true,
   "trailingComma": "all",
   "arrowParens": "always",
   "overrides": [
@@ -10,6 +11,12 @@
       "options": {
         "parser": "json"
       }
+    },
+    {
+      "files": ".prettierrc",
+      "options": {
+        "parser": "json"
+      }
     }
   ]
 }
diff --git a/packages/harmony-core/src/harmony.ts b/packages/harmony-core/src/harmony.ts
index cd21fe3..a338ee0 100644
--- a/packages/harmony-core/src/harmony.ts
+++ b/packages/harmony-core/src/harmony.ts
@@ -1,12 +1,12 @@
 import * as crypto from '@harmony-js/crypto';
 import * as utils from '@harmony-js/utils';
 
-import {HttpProvider, Messenger, WSProvider} from '@harmony-js/network';
-import {TransactionFactory, Transaction} from '@harmony-js/transaction';
-import {ContractFactory, Contract} from '@harmony-js/contract';
-import {Wallet, Account} from '@harmony-js/account';
-import {Blockchain} from './blockchain';
-import {HarmonyConfig} from './util';
+import { Provider, HttpProvider, Messenger, WSProvider } from '@harmony-js/network';
+import { TransactionFactory, Transaction } from '@harmony-js/transaction';
+import { ContractFactory, Contract } from '@harmony-js/contract';
+import { Wallet, Account } from '@harmony-js/account';
+import { Blockchain } from './blockchain';
+import { HarmonyConfig } from './util';
 
 export class Harmony extends utils.HarmonyCore {
   Modules = {
@@ -40,7 +40,7 @@ export class Harmony extends utils.HarmonyCore {
 
     const providerUrl = config.chainUrl || url;
 
-    this.provider = this.onInitSetProvider(providerUrl);
+    this.provider = new Provider(providerUrl).provider;
     this.messenger = new Messenger(this.provider, this.chainType, this.chainId);
     this.blockchain = new Blockchain(this.messenger);
     this.transactions = new TransactionFactory(this.messenger);
@@ -50,15 +50,7 @@ export class Harmony extends utils.HarmonyCore {
     this.utils = utils;
   }
   public setProvider(provider: string | HttpProvider | WSProvider): void {
-    if (utils.isHttp(provider) && typeof provider === 'string') {
-      this.provider = new HttpProvider(provider);
-    } else if (provider instanceof HttpProvider) {
-      this.provider = provider;
-    } else if (utils.isWs(provider) && typeof provider === 'string') {
-      this.provider = new WSProvider(provider);
-    } else if (provider instanceof WSProvider) {
-      this.provider = provider;
-    }
+    this.provider = new Provider(provider).provider;
     this.messenger.setProvider(this.provider);
     this.blockchain.setMessenger(this.messenger);
     this.wallet.setMessenger(this.messenger);
@@ -79,11 +71,4 @@ export class Harmony extends utils.HarmonyCore {
     this.wallet.setMessenger(this.messenger);
     this.transactions.setMessenger(this.messenger);
   }
-  private onInitSetProvider(providerUrl: string): HttpProvider | WSProvider {
-    return utils.isHttp(providerUrl)
-      ? new HttpProvider(providerUrl)
-      : utils.isWs(providerUrl)
-      ? new WSProvider(providerUrl)
-      : new HttpProvider(utils.defaultConfig.Default.Chain_URL);
-  }
 }
diff --git a/packages/harmony-crypto/src/keyTool.ts b/packages/harmony-crypto/src/keyTool.ts
index 6624f44..8f68bea 100644
--- a/packages/harmony-crypto/src/keyTool.ts
+++ b/packages/harmony-crypto/src/keyTool.ts
@@ -50,10 +50,11 @@ export const getAddressFromPrivateKey = (privateKey: string): string => {
 };
 
 export const getPublic = (privateKey: string, compress?: boolean): string => {
-  if (!isPrivateKey(privateKey)) {
+  if (!isPrivateKey(privateKey) || !validatePrivateKey(privateKey)) {
     throw new Error(`${privateKey} is not PrivateKey`);
   }
   const ecKey = secp256k1.keyFromPrivate(strip0x(privateKey), 'hex');
+
   return ecKey.getPublic(compress || false, 'hex');
 };
 
@@ -104,10 +105,7 @@ export const toChecksumAddress = (address: string): string => {
   return '0x' + chars.join('');
 };
 
-export const sign = (
-  digest: bytes.Arrayish | string,
-  privateKey: string,
-): bytes.Signature => {
+export const sign = (digest: bytes.Arrayish | string, privateKey: string): bytes.Signature => {
   if (!isPrivateKey(privateKey)) {
     throw new Error(`${privateKey} is not PrivateKey`);
   }
@@ -134,9 +132,7 @@ export function getContractAddress(from: string, nonce: number): string {
     throw new Error('missing from address');
   }
 
-  const addr = keccak256(
-    encode([from, bytes.stripZeros(bytes.hexlify(nonce))]),
-  );
+  const addr = keccak256(encode([from, bytes.stripZeros(bytes.hexlify(nonce))]));
   return '0x' + addr.substring(26);
 }
 
@@ -156,11 +152,7 @@ export function recoverPublicKey(
   const rs = { r: bytes.arrayify(sig.r), s: bytes.arrayify(sig.s) };
 
   ////
-  const recovered = secp256k1.recoverPubKey(
-    bytes.arrayify(digest),
-    rs,
-    sig.recoveryParam,
-  );
+  const recovered = secp256k1.recoverPubKey(bytes.arrayify(digest), rs, sig.recoveryParam);
 
   const key = recovered.encode('hex', false);
   const ecKey = secp256k1.keyFromPublic(key, 'hex');
@@ -189,8 +181,11 @@ export function recoverAddress(
  * @returns {boolean}
  */
 export const isValidChecksumAddress = (address: string): boolean => {
-  return (
-    isAddress(address.replace('0x', '')) &&
-    toChecksumAddress(address) === address
-  );
+  return isAddress(address.replace('0x', '')) && toChecksumAddress(address) === address;
+};
+
+export const validatePrivateKey = (privateKey: string): boolean => {
+  const ecKey = secp256k1.keyFromPrivate(strip0x(privateKey), 'hex');
+  const { result } = ecKey.validate();
+  return result;
 };
diff --git a/packages/harmony-network/src/index.ts b/packages/harmony-network/src/index.ts
index 6dc3545..9346109 100644
--- a/packages/harmony-network/src/index.ts
+++ b/packages/harmony-network/src/index.ts
@@ -1,5 +1,5 @@
 import mitt from 'mitt';
-export {mitt};
+export { mitt };
 // provider related
 export * from './providers/baseProvider';
 export * from './providers/baseSocket';
@@ -7,6 +7,7 @@ export * from './providers/defaultFetcher';
 export * from './providers/http';
 export * from './providers/ws';
 export * from './providers/emitter';
+export * from './providers/provider';
 // messenger and middlewares
 export * from './messenger/messenger';
 export * from './messenger/responseMiddleware';
diff --git a/packages/harmony-network/src/providers/provider.ts b/packages/harmony-network/src/providers/provider.ts
new file mode 100644
index 0000000..87d572c
--- /dev/null
+++ b/packages/harmony-network/src/providers/provider.ts
@@ -0,0 +1,55 @@
+import { HttpProvider } from './http';
+import { WSProvider } from './ws';
+import { defaultConfig, isHttp, isWs } from '@harmony-js/utils';
+
+export enum ProviderType {
+  http = 'http',
+  ws = 'ws',
+}
+
+export class Provider {
+  static getProvider(provider: string | HttpProvider | WSProvider) {
+    try {
+      this.getProvider(provider);
+      return new Provider(provider);
+    } catch (error) {
+      throw error;
+    }
+  }
+  public provider: WSProvider | HttpProvider;
+  public providerType: ProviderType;
+  constructor(url: string | WSProvider | HttpProvider) {
+    this.provider = this.onInitSetProvider(url);
+    this.providerType = this.getType(this.provider);
+  }
+  private onInitSetProvider(
+    providerUrl: string | HttpProvider | WSProvider,
+  ): HttpProvider | WSProvider {
+    if (typeof providerUrl === 'string') {
+      return isHttp(providerUrl)
+        ? new HttpProvider(providerUrl)
+        : isWs(providerUrl)
+        ? new WSProvider(providerUrl)
+        : new HttpProvider(defaultConfig.Default.Chain_URL);
+    }
+    try {
+      const providerType = this.getType(providerUrl);
+      if (providerType === ProviderType.http || providerType === ProviderType.ws) {
+        return providerUrl;
+      } else {
+        throw new Error('cannot get provider type');
+      }
+    } catch (error) {
+      throw error;
+    }
+  }
+  private getType(provider: HttpProvider | WSProvider) {
+    if (provider instanceof HttpProvider) {
+      return ProviderType.http;
+    }
+    if (provider instanceof WSProvider) {
+      return ProviderType.ws;
+    }
+    throw new Error('provider is not correct');
+  }
+}
diff --git a/packages/harmony-transaction/src/transaction.ts b/packages/harmony-transaction/src/transaction.ts
index 4b04058..bf185c0 100644
--- a/packages/harmony-transaction/src/transaction.ts
+++ b/packages/harmony-transaction/src/transaction.ts
@@ -9,7 +9,7 @@ import {
   getAddress,
   HarmonyAddress,
 } from '@harmony-js/crypto';
-import {add0xToString, numberToHex, ChainType, Unit} from '@harmony-js/utils';
+import { add0xToString, numberToHex, ChainType, Unit } from '@harmony-js/utils';
 import {
   Messenger,
   RPCMethod,
@@ -19,7 +19,7 @@ import {
   // SubscribeReturns,
   NewHeaders,
 } from '@harmony-js/network';
-import {TxParams, TxStatus, TransasctionReceipt} from './types';
+import { TxParams, TxStatus, TransasctionReceipt } from './types';
 import {
   recover,
   transactionFields,
@@ -80,19 +80,13 @@ class Transaction {
 
     this.to = params && params.to ? this.normalizeAddress(params.to) : '0x';
     this.value =
-      params && params.value
-        ? new Unit(params.value).asWei().toWei()
-        : new Unit(0).asWei().toWei();
+      params && params.value ? new Unit(params.value).asWei().toWei() : new Unit(0).asWei().toWei();
     this.data = params && params.data ? params.data : '0x';
     // chainid should change with different network settings
-    this.chainId =
-      params && params.chainId ? params.chainId : this.messenger.chainId;
-    this.rawTransaction =
-      params && params.rawTransaction ? params.rawTransaction : '0x';
+    this.chainId = params && params.chainId ? params.chainId : this.messenger.chainId;
+    this.rawTransaction = params && params.rawTransaction ? params.rawTransaction : '0x';
     this.unsignedRawTransaction =
-      params && params.unsignedRawTransaction
-        ? params.unsignedRawTransaction
-        : '0x';
+      params && params.unsignedRawTransaction ? params.unsignedRawTransaction : '0x';
     this.signature =
       params && params.signature
         ? params.signature
@@ -114,24 +108,15 @@ class Transaction {
 
     // temp setting to be compatible with eth
     const fields =
-      this.messenger.chainType === ChainType.Harmony
-        ? transactionFields
-        : transactionFieldsETH;
+      this.messenger.chainType === ChainType.Harmony ? transactionFields : transactionFieldsETH;
 
     fields.forEach((field: any) => {
       let value = (<any>this.txParams)[field.name] || [];
       value = arrayify(
-        hexlify(
-          field.transform === 'hex' ? add0xToString(value.toString(16)) : value,
-        ),
+        hexlify(field.transform === 'hex' ? add0xToString(value.toString(16)) : value),
       );
       // Fixed-width field
-      if (
-        field.fix === true &&
-        field.length &&
-        value.length !== field.length &&
-        value.length > 0
-      ) {
+      if (field.fix === true && field.length && value.length !== field.length && value.length > 0) {
         throw new Error(`invalid length for ${field.name}`);
       }
 
@@ -196,9 +181,7 @@ class Transaction {
       shardID: this.txParams.shardID ? numberToHex(this.shardID) : '0x',
       toShardID: this.txParams.toShardID ? numberToHex(this.toShardID) : '0x',
       gas: this.txParams.gasLimit ? numberToHex(this.txParams.gasLimit) : '0x',
-      gasPrice: this.txParams.gasPrice
-        ? numberToHex(this.txParams.gasPrice)
-        : '0x',
+      gasPrice: this.txParams.gasPrice ? numberToHex(this.txParams.gasPrice) : '0x',
       value: this.txParams.value ? numberToHex(this.txParams.value) : '0x',
       data: this.txParams.data || '0x',
       nonce: this.txParams.nonce ? numberToHex(this.nonce) : '0x',
@@ -239,17 +222,12 @@ class Transaction {
     this.toShardID = params && params.toShardID ? params.toShardID : 0;
     this.to = params && params.to ? this.normalizeAddress(params.to) : '0x';
     this.value =
-      params && params.value
-        ? new Unit(params.value).asWei().toWei()
-        : new Unit(0).asWei().toWei();
+      params && params.value ? new Unit(params.value).asWei().toWei() : new Unit(0).asWei().toWei();
     this.data = params && params.data ? params.data : '0x';
     this.chainId = params && params.chainId ? params.chainId : 0;
-    this.rawTransaction =
-      params && params.rawTransaction ? params.rawTransaction : '0x';
+    this.rawTransaction = params && params.rawTransaction ? params.rawTransaction : '0x';
     this.unsignedRawTransaction =
-      params && params.unsignedRawTransaction
-        ? params.unsignedRawTransaction
-        : '0x';
+      params && params.unsignedRawTransaction ? params.unsignedRawTransaction : '0x';
     this.signature =
       params && params.signature
         ? params.signature
@@ -310,10 +288,7 @@ class Transaction {
     if (!this.messenger) {
       throw new Error('Messenger not found');
     }
-    const res = await this.messenger.send(
-      RPCMethod.SendRawTransaction,
-      this.rawTransaction,
-    );
+    const res = await this.messenger.send(RPCMethod.SendRawTransaction, this.rawTransaction);
 
     // temporarilly hard coded
     if (res.isResult()) {
@@ -337,10 +312,7 @@ class Transaction {
       throw new Error('Messenger not found');
     }
     // TODO: regex validation for txHash so we don't get garbage
-    const res = await this.messenger.send(
-      RPCMethod.GetTransactionReceipt,
-      txHash,
-    );
+    const res = await this.messenger.send(RPCMethod.GetTransactionReceipt, txHash);
 
     if (res.isResult() && res.result !== null) {
       this.receipt = res.result;
@@ -363,20 +335,22 @@ class Transaction {
       } else {
         this.txStatus = TxStatus.PENDING;
         const currentBlock = await this.getBlockNumber();
+
         this.blockNumbers.push('0x' + currentBlock.toString('hex'));
+
         this.confirmationCheck += 1;
         return false;
       }
     } else {
+      this.txStatus = TxStatus.PENDING;
+      const currentBlock = await this.getBlockNumber();
+      this.blockNumbers.push('0x' + currentBlock.toString('hex'));
+      this.confirmationCheck += 1;
       return false;
     }
   }
 
-  async confirm(
-    txHash: string,
-    maxAttempts: number = 20,
-    interval: number = 1000,
-  ) {
+  async confirm(txHash: string, maxAttempts: number = 20, interval: number = 1000) {
     if (this.messenger.provider instanceof HttpProvider) {
       this.txStatus = TxStatus.PENDING;
       const oldBlock = await this.getBlockNumber();
@@ -390,6 +364,7 @@ class Transaction {
 
           if (newBlock.gte(nextBlock)) {
             checkBlock = newBlock;
+
             if (await this.trackTx(txHash)) {
               this.emitConfirm(this.txStatus);
               return this;
@@ -410,9 +385,7 @@ class Transaction {
       }
       this.txStatus = TxStatus.REJECTED;
       this.emitConfirm(this.txStatus);
-      throw new Error(
-        `The transaction is still not confirmed after ${maxAttempts} attempts.`,
-      );
+      throw new Error(`The transaction is still not confirmed after ${maxAttempts} attempts.`);
     } else {
       try {
         if (await this.trackTx(txHash)) {
@@ -426,22 +399,18 @@ class Transaction {
         this.txStatus = TxStatus.REJECTED;
         this.emitConfirm(this.txStatus);
         throw new Error(
-          `The transaction is still not confirmed after ${maxAttempts *
-            interval} mil seconds.`,
+          `The transaction is still not confirmed after ${maxAttempts * interval} mil seconds.`,
         );
       }
     }
   }
 
-  socketConfirm(
-    txHash: string,
-    maxAttempts: number = 20,
-  ): Promise<Transaction> {
+  socketConfirm(txHash: string, maxAttempts: number = 20): Promise<Transaction> {
     return new Promise((resolve, reject) => {
       const newHeads = Promise.resolve(new NewHeaders(this.messenger));
       newHeads.then((p) => {
         p.onData(async (data: any) => {
-          if (!this.blockNumbers.includes(data.number)) {
+          if (!this.blockNumbers.includes(data.params.result.number)) {
             if (await this.trackTx(txHash)) {
               this.emitConfirm(this.txStatus);
               await p.unsubscribe();
@@ -492,10 +461,7 @@ class Transaction {
   }
   async getBlockByNumber(blockNumber: string) {
     try {
-      const block = await this.messenger.send(RPCMethod.GetBlockByNumber, [
-        blockNumber,
-        true,
-      ]);
+      const block = await this.messenger.send(RPCMethod.GetBlockByNumber, [blockNumber, true]);
       if (block.isError()) {
         throw block.message;
       }
@@ -519,4 +485,4 @@ class Transaction {
     }
   }
 }
-export {Transaction};
+export { Transaction };