diff --git a/src/App.svelte b/src/App.svelte
index 0a14339..484b43c 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -7,23 +7,25 @@
 </script>
 
 <main>
-
   <div class="container">
     <div class="row">
       <div class="column">
         <img src={ethereumLogo} class="logo ethereum" alt="Ethereum Logo" />
         <h1>SendIt!</h1>
-        <p>A bulk NFT transfer utility made for transferring ERC-721 and ERC-1155 tokens between accounts easily.</p>
+        <p>
+          A bulk NFT transfer utility made for transferring ERC-721 and ERC-1155 tokens between accounts easily.
+          <br />
+          Made by <a href="https://lzahq.tech" target="_blank">lza_menace</a> and the <a href="https://art101.io" target="_blank">Art101</a> team.
+        </p>
+        <Providers />
+      </div>
+    </div>
+    <div class="row">
+      <div class="column">
+        <Contracts />
       </div>
     </div>
   </div>
-
-  <div class="card">
-    <Providers />
-  </div>
-
-  <Contracts />
-
 </main>
 
 <style>
diff --git a/src/Contracts.svelte b/src/Contracts.svelte
index 6f362cd..4be1c65 100644
--- a/src/Contracts.svelte
+++ b/src/Contracts.svelte
@@ -1,107 +1,181 @@
 <script>
 
-  import { defaultEvmStores as evm, selectedAccount, chainId, contracts } from 'svelte-web3';
+  import { defaultEvmStores as evm, selectedAccount, contracts, web3 } from 'svelte-web3';
   import IERC721 from '@openzeppelin/contracts/build/contracts/IERC721.json';
+  import IERC1155 from '@openzeppelin/contracts/build/contracts/IERC1155.json';
   import SendIt from './lib/sendit.json';
 
-  const chain = 1337;
-  const nft = '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9';
+  let errorMessage = '';
+  let successMessage = '';
+  let contractAddress = '';
+  let contractApproved = false;
+  let checked = false;
+  let selectedStandard = 1;
+  let tokenStandards = [
+    { id: 1, text: 'ERC-721' },
+    { id: 2, text: 'ERC-1155' }
+  ]
+  
+  // 0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9
   const sendit = '0x0165878A594ca255338adfa4d48449f69242Eb8F';
-  const to = '0x7c83E906aDD18C093B4B01ED40b6BCb25d348ED9';
+  // const to = '0x7c83E906aDD18C093B4B01ED40b6BCb25d348ED9';
   
   let amt = 10;
   let gasLimit = 0;
   let si_gasLimit = 0;
 
-  evm.attachContract('nft', nft, IERC721.abi);
-  evm.attachContract('sendit', sendit, SendIt.abi);
+  // evm.attachContract('nft', contractAddress, IERC721.abi);
+  // evm.attachContract('sendit', sendit, SendIt.abi);
+
+  const performCheck = async () => {
+    let tokenIds = [];
+    errorMessage = '';
 
-  const estimateCBT = async () => {
-    si_gasLimit = 0;
-    let tokenIndexes = [];
-    let recipients = [];
-    for (let i = 0; i < amt; i++) {
-        tokenIndexes[i] = i + 1;
-        recipients[i] = to;
+    // Check the contract is valid
+    try {
+      $web3.utils.toChecksumAddress(contractAddress)
+    } catch {
+      errorMessage = 'Invalid contract address supplied';
+      return;
     }
-    let i = await $contracts.nft.methods.isApprovedForAll($selectedAccount, sendit).call({from: $selectedAccount});
-    if (!i) {
-      await $contracts.nft.methods.setApprovalForAll(sendit, true).send({from: $selectedAccount});
+    // Check approval on the contract
+    if (selectedStandard == 1) {
+      evm.attachContract('nft', contractAddress, IERC721.abi);
+    } else {
+      evm.attachContract('nft', contractAddress, IERC1155.abi);
+    }
+    try {
+      let r = await $contracts.nft.methods.isApprovedForAll($selectedAccount, sendit);
+      console.log(r);
+    } catch {
+      errorMessage = 'Unable to check contract approvals';
+      return;
     }
-    await $contracts.sendit.methods.contractBulkTransfer(nft, tokenIndexes, recipients, false).estimateGas({from: $selectedAccount}, function(err, gas){
-      si_gasLimit += gas;
-    });
-  }
 
-  const estimateSTF = async () => {
-    gasLimit = 0;
-    for (let i = 0; i < amt; i++) {
-      await $contracts.nft.methods.safeTransferFrom($selectedAccount, to, i + 1).estimateGas({from: $selectedAccount}, function(err, gas){
-        gasLimit += gas;
-      });
+    // Check textarea syntax
+    let info = document.getElementById('recipientInfo').value;
+    let lines = info.split(/(\s+)/);
+    console.log(lines);
+    if (lines.length < 2) { errorMessage = 'Invalid recipient info.'; return; }
+    for (let i = 0; i < lines.length; i++) {
+      let line = lines[i].split(',');
+      if (line.length == 2) {
+        let recipient = line[0];
+        let tokenId = line[1];
+        try {
+          $web3.utils.toChecksumAddress(recipient)
+        } catch {
+          errorMessage = `Invalid recipient address supplied (line ${i + 1})`;
+          return;
+        }
+        // Check ownership of tokens
+        if (selectedStandard == 1) {
+          try {
+            let owner = await $contracts.nft.methods.ownerOf(tokenId).call();
+            if (owner.toLowerCase() != $selectedAccount.toLowerCase()) { throw new Error(`You must own the token in order to send it (token ${tokenId})`); }
+            if (tokenIds.includes(tokenId)) { throw new Error(`Duplicate token ID found (token ${tokenId})`); }
+            tokenIds.push(tokenId);
+          } catch(e) {
+            errorMessage = e;
+            return;
+          }
+        } else {
+          try {
+            let balance = await $contracts.nft.methods.balanceOf($selectedAccount, tokenId).call();
+            if (Number(balance) < 1) { throw new Error(`You must own the token in order to send it (token ${tokenId}, balance ${balance})`); }
+            if (tokenIds.length < Number(balance)) { throw new Error(`Provided more tokens than balance(token ${tokenId}, balance ${balance})`); }
+            tokenIds.push(tokenId);
+          } catch(e) {
+            errorMessage = e;
+            return;
+          }
+        }
+        
+
+      }
     }
+    
+    // Check gas consumption forecasts
+    // Show results
   }
 
-  function estimateGas() {
-    estimateCBT();
-    estimateSTF();
-  }
+  // const estimateCBT = async () => {
+  //   si_gasLimit = 0;
+  //   let tokenIndexes = [];
+  //   let recipients = [];
+  //   for (let i = 0; i < amt; i++) {
+  //       tokenIndexes[i] = i + 1;
+  //       recipients[i] = to;
+  //   }
+  //   let i = await $contracts.nft.methods.isApprovedForAll($selectedAccount, sendit).call({from: $selectedAccount});
+  //   if (!i) {
+  //     await $contracts.nft.methods.setApprovalForAll(sendit, true).send({from: $selectedAccount});
+  //   }
+  //   await $contracts.sendit.methods.contractBulkTransfer(nft, tokenIndexes, recipients, false).estimateGas({from: $selectedAccount}, function(err, gas){
+  //     si_gasLimit += gas;
+  //   });
+  // }
+
+  // const estimateSTF = async () => {
+  //   gasLimit = 0;
+  //   for (let i = 0; i < amt; i++) {
+  //     await $contracts.nft.methods.safeTransferFrom($selectedAccount, to, i + 1).estimateGas({from: $selectedAccount}, function(err, gas){
+  //       gasLimit += gas;
+  //     });
+  //   }
+  // }
+
+  // function estimateGas() {
+  //   estimateCBT();
+  //   estimateSTF();
+  // }
 
 </script>
 
 
-<div class="container">
+{#if $selectedAccount}
+<form>
   <div class="row">
-    <div class="column mt-2">
-      {#if $selectedAccount }
-        {#if $chainId !== chain }
-          <p>
-            Your are connected to the wrong network.
-          </p>
-        {:else if $contracts.nft}
-          {#await $contracts.nft.methods.balanceOf($selectedAccount).call() }
-            <span>checking balance...</span>
-          {:then balance}
-            <p>
-              Gas Required to send {amt} NFTs via OpenZeppelin ERC721 safeTransferFrom: {gasLimit}
-              <br />
-              Gas Required to send {amt} NFTs via SendIt ERC721 contractBulkTransfer: {si_gasLimit}
-              <br />
-              {$selectedAccount} has {balance} NFTs on local net (anvil).
-            </p>
-            <input bind:value={amt}>
-            <button class="button" on:click={estimateGas}>Test</button>
-          {/await}
-        {/if}
-      {:else}
-        <p>
-          Please first connect your wallet to be able to use this page.
-        </p>
-      {/if}
-
-      <form>
-        <div class="row">
-          <div class="six columns">
-            <label for="exampleEmailInput">Your email</label>
-            <input class="u-full-width" type="email" placeholder="test@mailbox.com" id="exampleEmailInput">
-          </div>
-          <div class="six columns">
-            <label for="exampleRecipientInput">Reason for contacting</label>
-            <select class="u-full-width" id="exampleRecipientInput">
-              <option value="Option 1">Questions</option>
-              <option value="Option 2">Admiration</option>
-              <option value="Option 3">Can I get your number?</option>
-            </select>
-          </div>
-        </div>
-        <label for="exampleMessage">Message</label>
-        <textarea class="u-full-width" placeholder="Hi Dave …" id="exampleMessage"></textarea>
-        <label class="example-send-yourself-copy">
-          <input type="checkbox">
-          <span class="label-body">Send a copy to yourself</span>
-        </label>
-        <input class="button-primary" type="submit" value="Submit">
-      </form>
+    <div class="six columns">
+      <label for="contractAddress">Contract Address</label>
+      <input class="u-full-width" type="text" placeholder="0x..." id="contractAddress" bind:value={contractAddress}>
+    </div>
+    <div class="six columns">
+      <label for="tokenStandard">Token Standard</label>
+      <select class="u-full-width" id="tokenStandard" bind:value={selectedStandard} on:change="{() => checked = false}">
+        {#each tokenStandards as s}
+          <option value={s.id}>
+            {s.text}
+          </option>
+        {/each}
+      </select>
     </div>
   </div>
-</div>
\ No newline at end of file
+  <label for="recipientInfo">Recipient Address, Token ID</label>
+  <textarea class="u-full-width" placeholder="0x653D2d1D10c79017b2eA5F5a6F02D9Ab6e725395,90
+0x653D2d1D10c79017b2eA5F5a6F02D9Ab6e725395,1775" id="recipientInfo"></textarea>
+  <br />
+  {#if checked}
+    <input class="button-primary" type="submit" value="Transfer">
+  {:else}
+    <input class="button" type="submit" value="Check" on:click|preventDefault={performCheck}>
+  {/if}
+</form>
+{/if}
+
+{#if errorMessage}
+<p id="errorMessage">{errorMessage}</p>
+{/if}
+
+{#if errorMessage}
+<p id="successMessage">{successMessage}</p>
+{/if}
+
+<style>
+  #errorMessage {
+    color: red;
+  }
+  #successMessage {
+    color: green;
+  }
+</style>
\ No newline at end of file
diff --git a/src/Providers.svelte b/src/Providers.svelte
index ccba931..3a176ce 100644
--- a/src/Providers.svelte
+++ b/src/Providers.svelte
@@ -20,17 +20,13 @@
   }
 </script>
 
-<div class="container">
-  <div class="row">
-    <div class="column mt-2">
-      {#if !$selectedAccount}
-        <button class="button" disabled={pending} on:click={connect}>{#if pending}connecting...{:else}Connect{/if}</button>
-      {:else}
-        <p>
-          Connected {$selectedAccount}
-        </p>
-        <button class="button" on:click={disconnect}>Disconnect</button>
-      {/if}
-    </div>
-  </div>
-</div>
+{#if !$selectedAccount}
+  <button class="button" disabled={pending} on:click={connect}>{#if pending}connecting...{:else}Connect{/if}</button>
+{:else}
+  <p>
+    Connected {$selectedAccount}
+    <br /><br />
+    <button class="button" on:click={disconnect}>Disconnect</button>
+  </p>
+  
+{/if}
\ No newline at end of file