diff --git a/public/dashwallet.js b/public/dashwallet.js
new file mode 100644
index 0000000..b7fe895
--- /dev/null
+++ b/public/dashwallet.js
@@ -0,0 +1,79 @@
+var DashWallet = ('object' === typeof module && exports) || {};
+(function (window, DashWallet) {
+	'use strict';
+
+	let DashTx = window.DashTx;
+
+	/**
+	 * @template {Pick<CoreUtxo, "satoshis">} T
+	 * @param {Array<T>} utxos
+	 * @param {Number} output - including fee estimate
+	 * @return {Array<T>}
+	 */
+	DashWallet.selectOptimalUtxos = function (utxos, satsOut) {
+		let balance = DashTx.sum(utxos);
+		let fees = DashTx.appraise({
+			//@ts-ignore
+			inputs: [{}],
+			outputs: [{}],
+		});
+
+		let fullSats = satsOut + fees.min;
+
+		if (balance < fullSats) {
+			return [];
+		}
+
+		// from largest to smallest
+		utxos.sort(function (a, b) {
+			return b.satoshis - a.satoshis;
+		});
+
+		/** @type Array<T> */
+		let included = [];
+		let total = 0;
+
+		// try to get just one
+		utxos.every(function (utxo) {
+			if (utxo.satoshis > fullSats) {
+				included[0] = utxo;
+				total = utxo.satoshis;
+				return true;
+			}
+			return false;
+		});
+		if (total) {
+			return included;
+		}
+
+		// try to use as few coins as possible
+		utxos.some(function (utxo, i) {
+			included.push(utxo);
+			total += utxo.satoshis;
+			if (total >= fullSats) {
+				return true;
+			}
+
+			// it quickly becomes astronomically unlikely to hit the one
+			// exact possibility that least to paying the absolute minimum,
+			// but remains about 75% likely to hit any of the mid value
+			// possibilities
+			if (i < 2) {
+				// 1 input 25% chance of minimum (needs ~2 tries)
+				// 2 inputs 6.25% chance of minimum (needs ~8 tries)
+				fullSats = fullSats + DashTx.MIN_INPUT_SIZE;
+				return false;
+			}
+			// but by 3 inputs... 1.56% chance of minimum (needs ~32 tries)
+			// by 10 inputs... 0.00953674316% chance (needs ~524288 tries)
+			fullSats = fullSats + DashTx.MIN_INPUT_SIZE + 1;
+		});
+		return included;
+	};
+
+	//@ts-ignore
+	window.DashWallet = DashWallet;
+})(globalThis.window || {}, DashWallet);
+if ('object' === typeof module) {
+	module.exports = DashWallet;
+}
diff --git a/public/index.html b/public/index.html
index b4f84be..9c46934 100644
--- a/public/index.html
+++ b/public/index.html
@@ -11,6 +11,7 @@
 		<script src="./node_modules/dashhd/dashhd.js"></script>
 		<script src="./node_modules/dashtx/dashtx.js"></script>
 		<script src="./dashjoin.js"></script>
+		<script src="./dashwallet.js"></script>
 		<style>
 			nav {
 				margin-bottom: 0.3rem;
@@ -158,7 +159,9 @@ <h1>Digital Cash Wallet</h1>
 					<table>
 						<thead>
 							<tr>
-								<th><input onchange="toggleAll(event)" type="checkbox" /></th>
+								<th>
+									<input onchange="App.toggleAll(event)" type="checkbox" />
+								</th>
 								<th>Amount</th>
 								<th>Address</th>
 								<th>TXID</th>
@@ -173,7 +176,9 @@ <h1>Digital Cash Wallet</h1>
 							<th></th>
 							<th>
 								<small
-									><button type="button">Denominate Selected</button></small
+									><button type="button" onclick="App.denominateCoins(event)">
+										Denominate Selected
+									</button></small
 								>
 							</th>
 							<th></th>
@@ -214,7 +219,9 @@ <h1>Digital Cash Wallet</h1>
 							/>
 						</label>
 						<small
-							><button type="button" onclick="setMax(event)">Max</button></small
+							><button type="button" onclick="App.setMax(event)">
+								Max
+							</button></small
 						>
 						<small><span data-id="send-dust">200</span> dust</small>
 						<!-- <label -->
@@ -239,7 +246,7 @@ <h1>Digital Cash Wallet</h1>
 						/>
 					</label>
 
-					<button type="submit" onclick="sendDash(event)">Send DASH</button>
+					<button type="submit" onclick="App.sendDash(event)">Send DASH</button>
 
 					<hr />
 					<label
@@ -262,8 +269,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="priority"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -274,8 +281,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="want"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -289,8 +296,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="priority"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -301,8 +308,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="want"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -316,8 +323,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="priority"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -328,8 +335,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="want"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -343,8 +350,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="priority"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -355,8 +362,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="want"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -370,8 +377,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="priority"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
@@ -382,8 +389,8 @@ <h1>Digital Cash Wallet</h1>
 								<th>
 									<input
 										name="want"
-										onkeyup="syncCashDrawer(event)"
-										onchange="syncCashDrawer(event)"
+										onkeyup="App.syncCashDrawer(event)"
+										onchange="App.syncCashDrawer(event)"
 										type="number"
 										step="1"
 										min="0"
diff --git a/public/wallet-app.js b/public/wallet-app.js
index 5b30c27..881013d 100644
--- a/public/wallet-app.js
+++ b/public/wallet-app.js
@@ -16,6 +16,10 @@
 	let Secp256k1 = window.nobleSecp256k1;
 
 	let DashJoin = window.DashJoin;
+	let DashWallet = window.DashWallet;
+
+	let App = {};
+	window.App = App;
 
 	const SATS = 100000000;
 	const MIN_BALANCE = 100001 * 1000;
@@ -28,6 +32,7 @@
 	let changeAddrs = [];
 	let receiveAddrs = [];
 	let spentAddrs = [];
+	let spendableAddrs = [];
 	let deltasMap = {};
 	let keysMap = {};
 	let denomsMap = {};
@@ -73,6 +78,7 @@
 		},
 	};
 	let dashTx = DashTx.create(keyUtils);
+	console.log('DEBUG dashTx instance', dashTx);
 
 	async function rpc(method, ...params) {
 		// typically http://localhost:19998/
@@ -121,6 +127,25 @@
 		localStorage.setItem(key, dataJson);
 	}
 
+	function getAllUtxos() {
+		let utxos = [];
+		let spendableAddrs = Object.keys(deltasMap);
+		for (let address of spendableAddrs) {
+			let info = deltasMap[address];
+			if (info.balance === 0) {
+				continue;
+			}
+			for (let coin of info.deltas) {
+				if (coin.reserved) {
+					continue;
+				}
+				Object.assign(coin, { outputIndex: coin.index });
+				utxos.push(coin);
+			}
+		}
+		return utxos;
+	}
+
 	function removeElement(arr, val) {
 		let index = arr.indexOf(val);
 		if (index !== -1) {
@@ -128,7 +153,7 @@
 		}
 	}
 
-	window.toggleAll = function (event) {
+	App.toggleAll = function (event) {
 		let checked = event.target.checked;
 
 		let $table = event.target.closest('table');
@@ -138,7 +163,7 @@
 		return true;
 	};
 
-	window.setMax = function (event) {
+	App.setMax = function (event) {
 		let totalSats = 0;
 		let addrs = Object.keys(deltasMap);
 		let fee = 100;
@@ -166,7 +191,7 @@
 		$('[data-id=send-dust]').textContent = dust;
 	};
 
-	window.sendDash = async function (event) {
+	App.sendDash = async function (event) {
 		event.preventDefault();
 
 		let amountStr = $('[data-id=send-amount]').value || 0;
@@ -197,24 +222,13 @@
 				let [address, txid, indexStr] = $coin.value.split(',');
 				let index = parseInt(indexStr, 10);
 				let coin = selectCoin(address, txid, index);
-				balance += coin.satoshis;
 				Object.assign(coin, { outputIndex: coin.index });
 				inputs.push(coin);
 			}
+			balance = DashTx.sum(inputs);
 		} else {
-			utxos = [];
-			let spendables = Object.keys(deltasMap);
-			for (let address of spendables) {
-				let info = deltasMap[address];
-				if (info.balance === 0) {
-					continue;
-				}
-				for (let coin of info.deltas) {
-					balance += coin.satoshis;
-					Object.assign(coin, { outputIndex: coin.index });
-					utxos.push(coin);
-				}
-			}
+			utxos = getAllUtxos();
+			balance = DashTx.sum(utxos);
 		}
 
 		if (balance < satoshis) {
@@ -486,7 +500,7 @@
 		}
 		return slots;
 	}
-	window.syncCashDrawer = function (event) {
+	App.syncCashDrawer = function (event) {
 		let isDirty = false;
 
 		let slots = getCashDrawer();
@@ -512,6 +526,17 @@
 			}
 		}
 
+		for (let slot of slots) {
+			let addrs = Object.keys(denomsMap[slot.denom]);
+			let have = addrs.length;
+			let need = slot.want - have;
+			need = Math.max(0, need);
+			if (need !== slot.need) {
+				isDirty = true;
+				slot.need = need;
+			}
+		}
+
 		if (isDirty) {
 			dbSet('cash-drawer-control', slots);
 		}
@@ -527,8 +552,8 @@
 			let $row = $(`[data-denom="${slot.denom}"]`);
 			let addrs = Object.keys(denomsMap[slot.denom]);
 			let have = addrs.length;
-			let need = slot.want - have;
-			need = Math.max(0, need);
+			slot.need = slot.want - have;
+			slot.need = Math.max(0, slot.need);
 
 			let priority = $('[name=priority]', $row).value;
 			if (priority) {
@@ -544,7 +569,7 @@
 			}
 
 			$('[data-name=have]', $row).textContent = have;
-			$('[data-name=need]', $row).textContent = need;
+			$('[data-name=need]', $row).textContent = slot.need;
 
 			for (let addr of addrs) {
 				cjBalance += denomsMap[slot.denom][addr].satoshis;
@@ -555,6 +580,105 @@
 		$('[data-id=cj-balance]').textContent = cjAmount.toFixed(8);
 	}
 
+	App.denominateCoins = function (event) {
+		console.log('DENOMINATE COINS');
+		event.preventDefault();
+
+		{
+			let addrs = Object.keys(deltasMap);
+			spendableAddrs.length = 0;
+
+			for (let address of addrs) {
+				let info = deltasMap[address];
+				if (info.balance === 0) {
+					continue;
+				}
+				spendableAddrs.push(address);
+			}
+		}
+
+		let slots = dbGet('cash-drawer-control');
+		console.log('slots', slots);
+
+		let priorityGroups = groupSlotsByPriorityAndAmount(slots);
+		console.log('priorityGroups', priorityGroups);
+
+		let priorities = Object.keys(priorityGroups);
+		priorities.sort(sortNumberDesc);
+		console.log('priorities', priorities);
+
+		for (let priority of priorities) {
+			let slots = priorityGroups[priority].slice(0);
+			slots.sort(sortSlotsByDenomDesc);
+
+			for (;;) {
+				let slot = slots.shift();
+				if (!slot) {
+					console.log('e: no slot');
+					break;
+				}
+				let isNeeded = slot.need >= 1;
+				if (!isNeeded) {
+					console.log('s: not needed', slot.denom);
+					continue;
+				}
+
+				let utxos = getAllUtxos();
+				let coins = DashWallet.selectOptimalUtxos(utxos, slot.denom);
+				let sats = DashTx.sum(coins);
+				if (sats < slot.denom) {
+					console.log(`not enough coins for ${slot.denom}`);
+					continue;
+				}
+
+				for (let coin of coins) {
+					coin.reserved = true;
+				}
+				slot.need -= 1;
+
+                // TODO DashTx.
+				console.log('Found coins to make denom', slot.denom, coins);
+
+				if (slot.need >= 1) {
+					// round-robin same priority
+					slots.push(slot);
+				}
+			}
+		}
+	};
+
+	function groupSlotsByPriorityAndAmount(slots) {
+		let priorityGroups = {};
+		for (let slot of slots) {
+			if (!priorityGroups[slot.priority]) {
+				priorityGroups[slot.priority] = [];
+			}
+			priorityGroups[slot.priority].push(slot);
+		}
+
+		return priorityGroups;
+	}
+
+	function sortNumberDesc(a, b) {
+		if (Number(a) < Number(b)) {
+			return 1;
+		}
+		if (Number(a) > Number(b)) {
+			return -1;
+		}
+		return 0;
+	}
+
+	function sortSlotsByDenomDesc(a, b) {
+		if (a.denom < b.denom) {
+			return 1;
+		}
+		if (a.denom > b.denom) {
+			return -1;
+		}
+		return 0;
+	}
+
 	async function updateDeltas(addrs) {
 		for (let address of addrs) {
 			let info = dbGet(address);