diff --git a/Bank b/Bank
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+++ b/Bank
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+<!DOCTYPE html>
+<html lang="pt-br">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Kert-One | Digital Bank</title>
+
+<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/qrcode-generator@1.4.4/qrcode.min.js"></script>
+<script src="https://unpkg.com/html5-qrcode"></script>
+<script src="https://cdn.tailwindcss.com"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/elliptic/6.5.4/elliptic.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.1.1/crypto-js.min.js"></script>
+<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
+</head>
+
+<body class="bg-gray-100 flex justify-center min-h-screen">
+<div class="w-full max-w-md bg-white min-h-screen shadow-xl flex flex-col">
+
+<header id="appHeader" class="hidden p-4 flex justify-between items-center bg-white shadow">
+<b id="displayUsername">Usuário</b>
+<button onclick="logout()">Sair</button>
+</header>
+
+<main class="flex-1 p-4">
+
+<div id="auth">
+<button onclick="generateWallet()" class="bg-orange-500 text-white w-full p-3 rounded mb-2">Criar Conta</button>
+<textarea id="pk" class="border p-2 w-full mb-2" placeholder="Private Key"></textarea>
+<button onclick="importWallet()" class="bg-black text-white w-full p-3 rounded">Importar</button>
+</div>
+
+<div id="main" class="hidden">
+<div class="bg-black text-white p-4 rounded mb-4">Saldo: <span id="balance">0.00</span> K$</div>
+<div class="text-xs break-all mb-4">Endereço: <span id="addr"></span></div>
+
+<input id="to" placeholder="Destino" class="border p-2 w-full mb-2">
+<input id="amount" type="number" placeholder="Valor" class="border p-2 w-full mb-2">
+<button onclick="processPayment()" class="bg-orange-500 text-white w-full p-3 rounded mb-4">Enviar</button>
+
+<h3 class="font-bold">Histórico</h3>
+<div id="history"></div>
+</div>
+
+</main>
+</div>
+
+<script>
+const API = window.location.origin;
+const EC = new elliptic.ec('secp256k1');
+let wallet = {};
+
+/* LOAD */
+window.onload = () => {
+    const w = localStorage.getItem('wallet');
+    if(w){ wallet = JSON.parse(w); loginSuccess(false); }
+};
+
+/* WALLET */
+function generateWallet(){
+    const key = EC.genKeyPair();
+    wallet = {
+        private: key.getPrivate('hex'),
+        public: key.getPublic('hex'),
+        address: 'k1'+CryptoJS.SHA256(key.getPublic('hex')).toString().substring(0,38)
+    };
+    localStorage.setItem('wallet', JSON.stringify(wallet));
+    loginSuccess();
+}
+
+function importWallet(){
+    const pk = document.getElementById('pk').value.trim();
+    const key = EC.keyFromPrivate(pk,'hex');
+    wallet = {
+        private: pk,
+        public: key.getPublic('hex'),
+        address: 'k1'+CryptoJS.SHA256(key.getPublic('hex')).toString().substring(0,38)
+    };
+    localStorage.setItem('wallet', JSON.stringify(wallet));
+    loginSuccess();
+}
+
+function loginSuccess(){
+    document.getElementById('auth').classList.add('hidden');
+    document.getElementById('main').classList.remove('hidden');
+    document.getElementById('appHeader').classList.remove('hidden');
+    addr.innerText = wallet.address;
+    updateBalance();
+    loadHistory();
+    setInterval(loadHistory, 8000);
+}
+
+/* BALANCE */
+async function updateBalance(){
+    const r = await axios.get(`${API}/balance/${wallet.address.replace('k1','')}`);
+    balance.innerText = parseFloat(r.data.balance).toFixed(2);
+}
+
+/* SIGN TX */
+function signTx(recipient, amount) {
+    const txId = crypto.randomUUID();
+    const fee = 0.01;
+    const timestamp = Date.now();
+
+    const tx = {
+        id: txId,
+        sender: wallet.address,
+        recipient: recipient,
+        amount: parseFloat(amount).toFixed(8),
+        fee: fee.toFixed(8),
+        timestamp: timestamp
+    };
+
+    // Ordenar igual Python sort_keys=True
+    const ordered = {};
+    Object.keys(tx).sort().forEach(k => ordered[k] = tx[k]);
+
+    const hash = CryptoJS.SHA256(JSON.stringify(ordered)).toString();
+
+    const key = EC.keyFromPrivate(wallet.private, 'hex');
+    const signature = key.sign(hash).toDER('hex');
+
+    return {
+        ...ordered,
+        public_key: wallet.public,
+        signature: signature
+    };
+}
+
+
+/* SEND */
+async function processPayment(){
+    const to = document.getElementById('to').value.trim();
+    const amount = parseFloat(document.getElementById('amount').value);
+    const tx = signTx(to, amount);
+    await axios.post(`${API}/tx/new`, tx);
+    updateBalance();
+    loadHistory();
+}
+
+/* HISTORY REAL */
+async function loadHistory(){
+    const r = await axios.get(`${API}/chain`);
+    const chain = r.data.chain;
+    const myAddr = wallet.address.replace("k1","");
+    history.innerHTML="";
+
+    chain.forEach(block=>{
+        block.transactions.forEach(tx=>{
+            if(tx.sender===myAddr || tx.recipient===myAddr){
+                const conf = chain.length - block.index + 1;
+                history.innerHTML += `
+                <div class="border p-2 mb-2 text-xs rounded">
+                    ${tx.sender===myAddr?'Enviado':'Recebido'} K$ ${tx.amount}<br>
+                    Confirmações: ${conf}<br>
+                    TX: ${tx.id}
+                </div>`;
+            }
+        });
+    });
+}
+
+function logout(){ localStorage.clear(); location.reload(); }
+</script>
+</body>
+</html>
