diff --git a/src/contracts/Metadata.contract.js b/src/contracts/Metadata.contract.js
index 4f1841e..521ab2a 100644
--- a/src/contracts/Metadata.contract.js
+++ b/src/contracts/Metadata.contract.js
@@ -122,9 +122,20 @@ export default class Metadata {
   }
 
   async confirmPendingChange({miningKeyToConfirm, senderVotingKey}) {
-    // you can't confirm your own
-    // you can't confirm twice
-    // 
+    let alreadyConfirmed = await this.metadataInstance.methods.isAddressAlreadyVoted(miningKeyToConfirm, senderVotingKey).call();
+    console.log(alreadyConfirmed)
+    if(alreadyConfirmed){
+      throw(
+        {message:
+          `You already confirmed this change.`})
+    }
+    const miningKeySender = await this.getMiningByVoting(senderVotingKey);
+    if(miningKeySender === miningKeyToConfirm){
+      throw(
+        {message:
+          `You cannot confirm your own changes.\n
+          Please ask other validators to verify your new information.`})
+    }
     return await this.metadataInstance.methods.confirmPendingChange(miningKeyToConfirm).send({from: senderVotingKey});
   }
 
@@ -138,6 +149,14 @@ export default class Metadata {
   }
 
   async finalize({miningKeyToConfirm, senderVotingKey}) {
+    const confirmations = await this.getConfirmations({miningKey: miningKeyToConfirm});
+    const getMinThreshold = await this.getMinThreshold({miningKey: miningKeyToConfirm});
+    if(Number(confirmations) < Number(getMinThreshold)){
+      throw(
+        {message:
+          `There is not enough confimations.\n
+          The minimum threshold to finalize is ${getMinThreshold}.`})
+    }
     return await this.metadataInstance.methods.finalize(miningKeyToConfirm).send({from: senderVotingKey});
   }
   
diff --git a/src/getWeb3.js b/src/getWeb3.js
index 7ff1b4b..980218c 100644
--- a/src/getWeb3.js
+++ b/src/getWeb3.js
@@ -2,14 +2,6 @@ let errorMsgNoMetamaskAccount = `You haven't chosen any account in MetaMask.
 Please, choose your initial key in MetaMask and reload the page.
 Check Oracles network <a href='https://github.com/oraclesorg/oracles-wiki' target='blank'>wiki</a> for more info.`;
 
-
-function generateElement(msg){
-  let errorNode = document.createElement("div");
-  errorNode.innerHTML = `<div>
-    ${msg}
-  </div>`;
-  return errorNode;
-}
 let getWeb3 = () => {
   return new Promise(function (resolve, reject) {
     // Wait for loading completion to avoid race conditions with web3 injection timing.
@@ -28,7 +20,7 @@ let getWeb3 = () => {
             case "12648430":
               netIdName = 'Oracles'
               console.log('This is oracles')
-              break
+              break;
             default:
               netIdName = 'ERROR'
               errorMsg = `You aren't connected to Oracles Network. 
@@ -38,10 +30,10 @@ let getWeb3 = () => {
           }
           var defaultAccount = web3.eth.defaultAccount || null;
           if(defaultAccount === null){
-            reject({msg: errorMsgNoMetamaskAccount, node: generateElement(errorMsgNoMetamaskAccount)})
+            reject({message: errorMsgNoMetamaskAccount})
           }
           if(errorMsg !== null){
-            reject({msg: errorMsg, node: generateElement(errorMsg)})
+            reject({message: errorMsg})
           }
           results = {
             web3Instance: web3,
@@ -56,7 +48,7 @@ let getWeb3 = () => {
         console.log('Injected web3 detected.');
 
       } else {
-        reject({msg: errorMsgNoMetamaskAccount, node: generateElement(errorMsgNoMetamaskAccount)})
+        reject({message: errorMsgNoMetamaskAccount})
         console.error('Metamask not found'); 
       }
     })