diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 2621d24f..f3849430 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -92,8 +92,8 @@ function ChainDB(chain, options) {
   // Average number of outputs per tx: 2.2
   // Average size of outputs per tx: 74b
   // Average number of txs: 2300
-  // Key size: 68b (* 2)
-  this.coinWindow = ((165 * 1024 + 5000 * 9) + (5000 * 68 * 2)) * 5;
+  // Key size: 66b (* 2)
+  this.coinWindow = ((165 * 1024 + 2300 * 4) + (2300 * 66 * 2)) * 5;
 
   this.coinCache = new bcoin.lru(this.coinWindow);
   this.cacheHash = new bcoin.lru(this.cacheWindow, 1);
@@ -782,7 +782,7 @@ ChainDB.prototype.removeBlock = function removeBlock(hash, batch, callback) {
 ChainDB.prototype.connectBlock = function connectBlock(block, batch, callback) {
   var self = this;
   var undo = new BufferWriter();
-  var i, j, tx, input, output, key, addresses, address, hash, coin;
+  var i, j, tx, input, output, key, addresses, address, hash, view, coins, raw;
 
   if (this.options.spv) {
     self.emit('add block', block);
@@ -830,31 +830,38 @@ ChainDB.prototype.connectBlock = function connectBlock(block, batch, callback) {
             batch.del('C/' + address + '/' + key);
         }
 
-        batch.del('c/' + key);
-
         Framer.coin(input.coin, false, undo);
 
-        self.coinCache.remove(key);
+        block.view.spend(input.prevout.hash, input.prevout.index);
       }
 
       for (j = 0; j < tx.outputs.length; j++) {
         output = tx.outputs[j];
-        key = hash + '/' + j;
 
         if (output.script.isUnspendable())
           continue;
 
-        coin = bcoin.coin.fromTX(tx, j).toRaw();
-
         if (self.options.indexAddress) {
           address = output.getHash();
           if (address)
             batch.put('C/' + address + '/' + key, DUMMY);
         }
+      }
 
-        batch.put('c/' + key, coin);
+      block.view.add(tx.toCoins());
+    }
 
-        self.coinCache.set(key, coin);
+    view = block.view.toArray();
+
+    for (i = 0; i < view.length; i++) {
+      coins = view[i];
+      if (coins.count() === 0) {
+        batch.del('c/' + coins.hash);
+        self.coinCache.remove(coins.hash);
+      } else {
+        raw = coins.toRaw();
+        batch.put('c/' + coins.hash, raw);
+        self.coinCache.set(coins.hash, raw);
       }
     }
 
@@ -880,7 +887,7 @@ ChainDB.prototype.connectBlock = function connectBlock(block, batch, callback) {
 
 ChainDB.prototype.disconnectBlock = function disconnectBlock(block, batch, callback) {
   var self = this;
-  var i, j, tx, input, output, key, addresses, address, hash, coin;
+  var i, j, tx, input, output, key, addresses, address, hash, view, coins, raw;
 
   if (this.options.spv)
     return utils.nextTick(callback);
@@ -922,13 +929,11 @@ ChainDB.prototype.disconnectBlock = function disconnectBlock(block, batch, callb
             batch.put('C/' + address + '/' + key, DUMMY);
         }
 
-        coin = input.coin.toRaw();
-
-        batch.put('c/' + key, coin);
-
-        self.coinCache.set(key, coin);
+        block.view.addCoin(input.coin);
       }
 
+      block.view.add(tx.toCoins());
+
       for (j = 0; j < tx.outputs.length; j++) {
         output = tx.outputs[j];
         key = hash + '/' + j;
@@ -942,9 +947,21 @@ ChainDB.prototype.disconnectBlock = function disconnectBlock(block, batch, callb
             batch.del('C/' + address + '/' + key);
         }
 
-        batch.del('c/' + key);
+        block.view.spend(hash, j);
+      }
+    }
 
-        self.coinCache.remove(key);
+    view = block.view.toArray();
+
+    for (i = 0; i < view.length; i++) {
+      coins = view[i];
+      if (coins.count() === 0) {
+        batch.del('c/' + coins.hash);
+        self.coinCache.remove(coins.hash);
+      } else {
+        raw = coins.toRaw();
+        batch.put('c/' + coins.hash, raw);
+        self.coinCache.set(coins.hash, raw);
       }
     }
 
@@ -1048,29 +1065,62 @@ ChainDB.prototype.fillHistory = function fillHistory(tx, callback) {
  */
 
 ChainDB.prototype.getCoin = function getCoin(hash, index, callback) {
-  var self = this;
-  var key = hash + '/' + index;
   var coin;
 
-  coin = this.coinCache.get(key);
-  if (coin) {
-    callback = utils.asyncify(callback);
+  this.getCoins(hash, true, function(err, coins) {
+    if (err)
+      return callback(err);
+
+    if (!coins)
+      return callback();
+
     try {
-      coin = bcoin.coin.fromRaw(coin);
-      coin.hash = hash;
-      coin.index = index;
+      coin = bcoin.coins.parseCoin(coins, hash, index);
     } catch (e) {
       return callback(e);
     }
+
     return callback(null, coin);
+  });
+};
+
+/**
+ * Get coins (unspents only).
+ * @param {Hash} hash
+ * @param {Function} callback - Returns [Error, {@link Coins}].
+ */
+
+ChainDB.prototype.getCoins = function getCoins(hash, raw, callback) {
+  var self = this;
+  var coins;
+
+  if (!callback) {
+    callback = raw;
+    raw = false;
   }
 
-  this.db.fetch('c/' + key, function(data) {
-    var coin = bcoin.coin.fromRaw(data);
-    coin.hash = hash;
-    coin.index = index;
-    self.coinCache.set(key, data);
-    return coin;
+  coins = this.coinCache.get(hash);
+
+  if (coins) {
+    callback = utils.asyncify(callback);
+
+    if (raw)
+      return callback(null, coins);
+
+    try {
+      coins = bcoin.coins.fromRaw(coins, hash);
+    } catch (e) {
+      return callback(e);
+    }
+
+    return callback(null, coins);
+  }
+
+  this.db.fetch('c/' + hash, function(data) {
+    self.coinCache.set(hash, data);
+    if (raw)
+      return data;
+    return bcoin.coins.fromRaw(data, hash);
   }, callback);
 };
 
@@ -1128,27 +1178,32 @@ ChainDB.prototype.getCoinsByAddress = function getCoinsByAddress(addresses, call
 
   utils.forEachSerial(addresses, function(address, next) {
     address = bcoin.address.getHash(address);
+
     if (!address)
       return next();
-    self.db.lookup({
+
+    self.db.iterate({
       gte: 'C/' + address,
       lte: 'C/' + address + '~',
       transform: function(key) {
         key = key.split('/');
-        return 'c/' + key[2] + '/' + key[3];
-      },
-      parse: function(data, key) {
-        var coin = bcoin.coin.fromRaw(data);
-        var hash = key.split('/');
-        coin.hash = hash[1];
-        coin.index = +hash[2];
-        return coin;
+        return [key[2], +key[3]];
       }
-    }, function(err, coin) {
+    }, function(err, keys) {
       if (err)
         return next(err);
-      coins = coins.concat(coin);
-      next();
+
+      utils.forEachSerial(keys, function(key, next) {
+        self.getCoin(key[0], key[1], function(err, coin) {
+          if (err)
+            return callback(err);
+
+          if (coin)
+            coins.push(coin);
+
+          return next();
+        });
+      }, next);
     });
   }, function(err) {
     if (err)
@@ -1284,9 +1339,21 @@ ChainDB.prototype._ensureHistory = function _ensureHistory(hash, callback) {
  */
 
 ChainDB.prototype.fillBlock = function fillBlock(block, callback) {
+  var self = this;
+  var view = new bcoin.coinview();
   var coins, spent, i, tx, hash, j, input, key;
 
-  return this.fillCoins(block.txs, function(err) {
+  utils.forEachSerial(block.getPrevout(), function(prevout, next) {
+    self.getCoins(prevout, function(err, coins) {
+      if (err)
+        return next(err);
+
+      if (coins)
+        view.add(coins);
+
+      next();
+    });
+  }, function(err) {
     if (err)
       return callback(err);
 
@@ -1297,6 +1364,8 @@ ChainDB.prototype.fillBlock = function fillBlock(block, callback) {
       tx = block.txs[i];
       hash = tx.hash('hex');
 
+      view.fill(tx);
+
       for (j = 0; j < tx.inputs.length; j++) {
         input = tx.inputs[j];
         key = input.prevout.hash + '/' + input.prevout.index;
@@ -1318,6 +1387,8 @@ ChainDB.prototype.fillBlock = function fillBlock(block, callback) {
         coins[hash + '/' + j] = bcoin.coin.fromTX(tx, j);
     }
 
+    block.view = view;
+
     return callback(null, block);
   });
 };
@@ -1350,30 +1421,36 @@ ChainDB.prototype.getUndoCoins = function getUndoCoins(hash, callback) {
  */
 
 ChainDB.prototype.fillHistoryBlock = function fillHistoryBlock(block, callback) {
+  var self = this;
   var i, j, k, tx, input;
 
-  return this.getUndoCoins(block.hash('hex'), function(err, coins) {
+  return this.fillBlock(block, function(err) {
     if (err)
       return callback(err);
 
-    if (!coins)
-      return callback(null, block);
+    return self.getUndoCoins(block.hash('hex'), function(err, coins) {
+      if (err)
+        return callback(err);
 
-    for (i = 0, k = 0; i < block.txs.length; i++) {
-      tx = block.txs[i];
+      if (!coins)
+        return callback(null, block);
 
-      if (tx.isCoinbase())
-        continue;
+      for (i = 0, k = 0; i < block.txs.length; i++) {
+        tx = block.txs[i];
 
-      for (j = 0; j < tx.inputs.length; j++) {
-        input = tx.inputs[j];
-        input.coin = coins[k++];
-        input.coin.hash = input.prevout.hash;
-        input.coin.index = input.prevout.index;
+        if (tx.isCoinbase())
+          continue;
+
+        for (j = 0; j < tx.inputs.length; j++) {
+          input = tx.inputs[j];
+          input.coin = coins[k++];
+          input.coin.hash = input.prevout.hash;
+          input.coin.index = input.prevout.index;
+        }
       }
-    }
 
-    return callback(null, block);
+      return callback(null, block);
+    });
   });
 };
 
@@ -1427,32 +1504,13 @@ ChainDB.prototype.isUnspentTX = function isUnspentTX(hash, callback) {
  */
 
 ChainDB.prototype.isSpentTX = function isSpentTX(hash, callback) {
-  var iter;
-
   if (hash.hash)
     hash = hash.hash('hex');
 
-  iter = this.db.iterator({
-    gte: 'c/' + hash,
-    lte: 'c/' + hash + '~',
-    keys: true,
-    values: false,
-    fillCache: false,
-    keyAsBuffer: false
-  });
-
-  iter.next(function(err, key, value) {
-    if (err) {
-      return iter.end(function() {
-        callback(err);
-      });
-    }
-
-    iter.end(function(err) {
-      if (err)
-        return callback(err);
-      return callback(null, key === undefined);
-    });
+  this.getCoins(hash, function(err, coins) {
+    if (err)
+      return callback(err);
+    return callback(null, !coins);
   });
 };