diff --git a/backend/app.js b/backend/app.js
index 163387f..ec954eb 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -26,6 +26,8 @@ const rpc = stdrpc({
 	password: fullnode.password
 });
 
+var async = require('async');
+
 const CoinGeckoClient = new CoinGecko();
 
 var intervalObject = setInterval( function() {
@@ -63,6 +65,86 @@ var intervalObject = setInterval( function() {
 	});
 }, 90000);
 
+function hexToString(hexString) {
+	var str = '';
+	for (var n=0; n < hexString.length; n +=2) {
+		str += String.fromCharCode(parseInt(hexString.substr(n, 2), 16));
+	}
+	return str;
+}
+
+var blockInterval = setInterval( function() {
+	console.log('Node periodic Zcash scan');
+	//usermodel.find({}, function (err, docs) {
+		//if (err) {
+			//console.log(err);
+		//} else {
+			//console.log(session, blocktime);
+			//console.log(docs);
+		//}
+	//});
+	rpc.z_listreceivedbyaddress(fullnode.addr, 10).then(txs => {
+		var re = /.*ZGO::(.*)\sReply-To:\s(z\w+)/;
+		async.each (txs, function(txData, callback) {
+			var memo = hexToString(txData.memo);
+			if (re.test(memo)) {
+				//console.log('Processing tx:', memo);
+				var match = re.exec(memo);
+				if (match != null) {
+					var address = match[2];
+					var session = match[1];
+					var blocktime = txData.blocktime;
+					//console.log('  ', session, blocktime);
+					usermodel.findOne({address: address, session: session, blocktime: blocktime}).then(function(doc){
+						if (doc != null) {
+							console.log('Found user');
+						} else {
+							console.log('User not found', session, blocktime);
+							var user = new usermodel({
+								address: address,
+								session: session,
+								blocktime: blocktime
+							});
+							user.save(function(error) {
+								if (error) {
+									console.log(error);
+								}
+
+								console.log('User saved');
+							});
+						}
+					});
+					ownermodel.findOne({address: address}).then(function (oDoc) {
+						if (oDoc != null) {
+							console.log('Found owner');
+						} else {
+							console.log('Owner not found', session);
+							var owner = new ownermodel({
+								address: address,
+								name: 'Z-Go-'.concat(address.substring(0,5))
+							});
+							owner.save().then(function(err) {
+								if (err) {
+									console.log(err);
+								}
+								console.log('Owner saved!');
+							});
+						}
+					}).catch((err) => {
+						console.log(err);
+					});
+				}
+			}
+		}, function (err) {
+			if (err) {
+				console.log(err);
+			}
+			console.log('Txs synced');
+		});
+
+	});
+}, 90000);
+
 app.use(bodyparser.json());
 
 app.use((req, res, next) => {
@@ -73,73 +155,41 @@ app.use((req, res, next) => {
 	next();
 });
 
-app.post('/api/posts', (req, res, next) => {
-	const post = new postmodel({
-		title: req.body.title,
-		content: req.body.content
-	});
-	post.save();
-	//console.log(req.ip);
-	res.status(201).json({
-		message: 'Post added successfully'
-	});
-});
 
-app.get('/api/posts', (req, res, next) => {
-	postmodel.find().
-		then((documents) => {
-			//console.log(documents);
-			res.status(200).json({
-				message: 'Posts Fetched successfully',
-				posts: documents
-			});
-		});
-});
-
-/*
- * Add a new user
- * @param address: String. Shielded zcash address
- * @param session: String. Browser session uuid
- * @param blocktime: Number. Blocktime of login zcash transaction
- */
-
-app.post('/api/users', (req, res, next) => {
-	console.log('Post: /api/users');
-	const user = new usermodel({
-		address: req.body.address,
-		session: req.body.session,
-		blocktime: req.body.blocktime
-	});
-	user.save();
-	res.status(201).json({
-		message: 'User added successfully'
-	});
-});
 
 app.get('/api/users', (req, res, next) => {
 	console.log('Get: /api/users');
 	usermodel.find({'address': req.query.address, 'session': req.query.session}).
 		then((documents) => {
-			console.log("Searching");
-			res.status(200).json({
-				message: 'Users found successfully',
-				users: documents
-			});
+			if (documents != null) {
+				res.status(200).json({
+					message: 'Users found successfully',
+					users: documents
+				});
+			} else {
+				res.status(204).json({
+					message: 'User not found',
+					users: null
+				});
+			}
 		});
 });
 
 app.get('/api/getuser', (req, res, next) => {
 	console.log('Get: /api/getuser/', req.query.session);
-	usermodel.find({'session': req.query.session}).
+	var today = new Date().getTime() / 1000;
+	var expiration = today - (7*24*3600);
+	usermodel.find({'session': req.query.session, 'blocktime': { $gt: expiration }}).
 		then((documents) => {
-			console.log("Searching for user...");
 			if(documents.length > 0){
 				//console.log(documents);
+				console.log('   found user');
 				res.status(200).json({
 					message: 'User found!',
 					user: documents
 				});
 			} else {
+				console.log('   did not find user');
 				res.status(204).json({
 					message: 'User not found!',
 					user: null
@@ -159,9 +209,10 @@ app.get('/api/blockheight', (req, res, next) => {
 });
 
 
+
 app.get('/api/txs', (req, res, next) => {
 	console.log('Get: /api/txs');
-	rpc.z_listreceivedbyaddress(fullnode.addr, 5).then(txs => {
+	rpc.z_listreceivedbyaddress(fullnode.addr, 10).then(txs => {
 		res.status(200).json({
 			message: 'Transactions found',
 			txs: txs
diff --git a/backend/models/owner.js b/backend/models/owner.js
index 38fac2e..195f809 100644
--- a/backend/models/owner.js
+++ b/backend/models/owner.js
@@ -1,7 +1,7 @@
 const mongoose = require('mongoose');
 
 const ownerSchema = mongoose.Schema({
-	address: {type: String, required:true},
+	address: {type: String, required:true, unique:true},
 	name: {type: String, required:true}
 });
 
diff --git a/package-lock.json b/package-lock.json
index e687459..9ea2c22 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
-  "name": "sell4zec",
+  "name": "zgo",
   "version": "0.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "sell4zec",
+      "name": "zgo",
       "version": "0.0.0",
       "dependencies": {
         "@angular/animations": "~12.2.0",
@@ -20,6 +20,7 @@
         "@angular/router": "~12.2.0",
         "@supercharge/request-ip": "^1.1.2",
         "angular-local-storage": "^0.7.1",
+        "async": "^3.2.2",
         "coingecko-api": "^1.0.10",
         "easyqrcodejs": "^4.4.6",
         "material-design-icons": "^3.0.1",
@@ -3251,13 +3252,9 @@
       }
     },
     "node_modules/async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
-      "dev": true,
-      "dependencies": {
-        "lodash": "^4.17.14"
-      }
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.2.tgz",
+      "integrity": "sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g=="
     },
     "node_modules/async-each": {
       "version": "1.0.3",
@@ -10305,6 +10302,15 @@
         "node": ">= 0.12.0"
       }
     },
+    "node_modules/portfinder/node_modules/async": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "dev": true,
+      "dependencies": {
+        "lodash": "^4.17.14"
+      }
+    },
     "node_modules/portfinder/node_modules/debug": {
       "version": "3.2.7",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
@@ -17997,13 +18003,9 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.17.14"
-      }
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.2.tgz",
+      "integrity": "sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g=="
     },
     "async-each": {
       "version": "1.0.3",
@@ -23475,6 +23477,15 @@
         "mkdirp": "^0.5.5"
       },
       "dependencies": {
+        "async": {
+          "version": "2.6.3",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+          "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+          "dev": true,
+          "requires": {
+            "lodash": "^4.17.14"
+          }
+        },
         "debug": {
           "version": "3.2.7",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
diff --git a/package.json b/package.json
index 21efbb3..2682b3f 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "@angular/router": "~12.2.0",
     "@supercharge/request-ip": "^1.1.2",
     "angular-local-storage": "^0.7.1",
+    "async": "^3.2.2",
     "coingecko-api": "^1.0.10",
     "easyqrcodejs": "^4.4.6",
     "material-design-icons": "^3.0.1",
diff --git a/src/app/fullnode.service.ts b/src/app/fullnode.service.ts
index d2e8389..f2cef8f 100644
--- a/src/app/fullnode.service.ts
+++ b/src/app/fullnode.service.ts
@@ -21,7 +21,6 @@ export class FullnodeService{
 	constructor(private http: HttpClient, public userService: UserService){
 		this.getAddr();
 		this.getHeight();
-		this.getMemos();
 		this.getPrice();
 	}
 
@@ -60,42 +59,6 @@ export class FullnodeService{
 		return str;
 	}
 
-	getMemos() {
-		this.http.get<{message: string, txs: any}>('http://localhost:3000/api/txs').
-		subscribe((TxData) => {
-			var memos: string[] = [];
-			//this.addr = TxData.addr;
-			var re = /.*ZGO::(.*)\sReply-To:\s(z\w+)/;
-			for (var i=0; i < TxData.txs.length; i++) {
-				var memo = this.hexToString(TxData.txs[i].memo);
-				//console.log(TxData.txs[i].blocktime);
-				if (re.test(memo)){
-					memos.push(memo);
-					var match = re.exec(memo);
-					if (match != null) {
-						var address = match[2];
-						var session = match[1];
-						var blocktime = TxData.txs[i].blocktime;
-						console.log(memo);
-						console.log(`Searching for user for ${session}`);
-						const params = new HttpParams().append('session', session);
-						this.http.get<{message: string, user: any}>('http://localhost:3000/api/getuser', { headers:{}, params: params, observe: 'response'}).
-						subscribe((UserDataResponse) => {
-							console.log(UserDataResponse.status);
-							if (UserDataResponse.status == 200){
-								console.log(`FS: Found user`);
-							} else {
-								console.log('FS: Did not find user');
-								this.userService.addUser(address, session, blocktime);
-							}
-						});
-					}
-				}
-			}
-			this.dataStore.memoList = memos;
-			this._memoUpdated.next(Object.assign({},this.dataStore).memoList);
-		});
-	}
 
 
 	getAddr() {
diff --git a/src/app/login/login.component.ts b/src/app/login/login.component.ts
index a9942c3..a088018 100644
--- a/src/app/login/login.component.ts
+++ b/src/app/login/login.component.ts
@@ -17,7 +17,6 @@ var Buffer = require('buffer/').Buffer;
 
 export class LoginComponent implements OnInit {
 	intervalHolder: any;
-	memos: string[] = [];
 	nodeAddress: string = '';
 	private FullnodeSub: Subscription = new Subscription();
 	private UserSub: Subscription = new Subscription();
@@ -46,46 +45,47 @@ export class LoginComponent implements OnInit {
 			if(localToken == null){
 				var token = uuidv4();
 				localStorage.setItem('s4z_token', token);
-				console.log('Showing QR code for login');
-				console.log(URLSafeBase64.encode(Buffer.from('ZGO::'.concat(token))));
-				var codeString = `zcash:${this.nodeAddress}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('ZGO::'.concat(token)))}`;
-				console.log(codeString);
-				var qrcode = new QRCode(document.getElementById("qrcode"), {
-					text: codeString,
-					logo: "/assets/zcash.png",
-					logoWidth: 80,
-					logoHeight: 80
-				});
-			} else {
-				//this.userService.getUser(localToken);
-				this.userService.uZaddrUpdate.
-					subscribe((userAddr: string) => {
-					if (userAddr.length != 0) {
-						console.log('Log in found!');
-						this.router.navigate(['/view']);
-					} else {
-						console.log('No login for existing token found');
-						console.log('Showing QR code for login');
-						//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken))));
-						var codeString = `zcash:${this.nodeAddress}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('ZGO::'.concat(localToken!)))}`;
-						console.log(codeString);
-						var qrcode = new QRCode(document.getElementById("qrcode"), {
-							text: codeString,
-							logo: "/assets/zcash.png",
-							logoWidth: 80,
-							logoHeight: 80
-						});
-					}
-				});
+				localToken = token;
 			}
+			this.userService.findUser();
+			this.userService.uZaddrUpdate.
+				subscribe((userAddr: string) => {
+				if (userAddr.length != 0) {
+					console.log('Log in found!');
+					this.router.navigate(['/view']);
+				} else {
+					console.log('No login for existing token found');
+					console.log('Showing QR code for login');
+					//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken))));
+					var codeString = `zcash:${this.nodeAddress}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('ZGO::'.concat(localToken!)))}`;
+					console.log(codeString);
+					var qrcode = new QRCode(document.getElementById("qrcode"), {
+						text: codeString,
+						logo: "/assets/zcash.png",
+						logoWidth: 80,
+						logoHeight: 80
+					});
+				}
+			});
 		});
 		this.intervalHolder = setInterval(() => {
 			this.fullnodeService.getHeight();
-			this.fullnodeService.getMemos();
+			//this.userService.findUser();
+			this.loginCheck();
 			this._changeDetectorRef.markForCheck();
 		}, 1000 * 75);
 	}
 
+	loginCheck(){
+		this.userService.findUser();
+		this.uZaddrUpdate.subscribe((userAddr: string) => {
+			if (userAddr.length != 0) {
+				console.log('Log in found in blockchain!');
+				this.router.navigate(['/view']);
+			}
+		});
+	}
+
 	ngOnDestroy(){
 		this.FullnodeSub.unsubscribe();
 		this.UserSub.unsubscribe();
diff --git a/src/app/user.service.ts b/src/app/user.service.ts
index 0053bf2..b78e1ba 100644
--- a/src/app/user.service.ts
+++ b/src/app/user.service.ts
@@ -38,38 +38,31 @@ export class UserService{
 	}
 
 	findUser() {
-		const params = new HttpParams().append('session', this.session!);
-		let obs = this.http.get<{message: string, user: any}>('http://localhost:3000/api/getuser', { headers:{}, params: params, observe: 'response'});
+		this.session = localStorage.getItem('s4z_token');
+		if (this.session != null) {
+			const params = new HttpParams().append('session', this.session!);
+			let obs = this.http.get<{message: string, user: any}>('http://localhost:3000/api/getuser', { headers:{}, params: params, observe: 'response'});
 
-		obs.subscribe((UserDataResponse) => {
-			console.log(UserDataResponse.status);
-			if (UserDataResponse.status == 200){
-				this.dataStore.user = UserDataResponse.body!.user[0];
-				console.log(`US: Found user, returning it`);
-				this._uZaddrUpdated.next(Object.assign({},this.dataStore).user.address);
-				this._userUpdated.next(Object.assign({}, this.dataStore).user);
-				this.getOwner(Object.assign({},this.dataStore.user).address);
-			} else {
-				console.log('US: Did not find user');
-			}
-		});
+			obs.subscribe((UserDataResponse) => {
+				console.log(UserDataResponse.status);
+				if (UserDataResponse.status == 200){
+					this.dataStore.user = UserDataResponse.body!.user[0];
+					console.log(`US: Found user, returning it`);
+					this._uZaddrUpdated.next(Object.assign({},this.dataStore).user.address);
+					this._userUpdated.next(Object.assign({}, this.dataStore).user);
+					this.getOwner(Object.assign({},this.dataStore.user).address);
+				} else {
+					console.log('US: Did not find user');
+				}
+			});
 
-		return obs;
+			return obs;
+		} else {
+			console.log('No session loaded');
+			return null;
+		}
 	}
 	
-	addUser(address: string, session: string, blocktime: number) {
-		const user: User={_id: '', address: address, session: session, blocktime: blocktime};
-		let obs = this.http.post<{message: string}>('http://localhost:3000/api/users', user);
-
-		obs.subscribe((responseData) => {
-			console.log(responseData.message);
-			this.getOwner(address).subscribe((response) => {
-				console.log('addUser, checking owner', response);
-			});
-		});
-
-		return obs;
-	}
 
 	addOwner(address: string) {
 		const owner: Owner={_id: '', address: address, name: 'Zgo-'.concat(address.substring(0,5))};