diff --git a/bin/node b/bin/node
index 3ed9a5ee..4e1f9a31 100755
--- a/bin/node
+++ b/bin/node
@@ -28,8 +28,7 @@ const node = new FullNode({
   logFile: true,
   logConsole: true,
   logLevel: 'debug',
-  db: 'leveldb',
-  persistent: true,
+  memory: false,
   workers: true,
   listen: true,
   loader: require
diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index 8e41f03c..f98dc92a 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -2655,7 +2655,7 @@ class ChainOptions {
 
     this.prefix = null;
     this.location = null;
-    this.db = 'memory';
+    this.memory = true;
     this.maxFiles = 64;
     this.cacheSize = 32 << 20;
     this.compression = true;
@@ -2716,9 +2716,9 @@ class ChainOptions {
       this.location = options.location;
     }
 
-    if (options.db != null) {
-      assert(typeof options.db === 'string');
-      this.db = options.db;
+    if (options.memory != null) {
+      assert(typeof options.memory === 'boolean');
+      this.memory = options.memory;
     }
 
     if (options.maxFiles != null) {
diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index f4bd0481..d2469b0b 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -1970,7 +1970,7 @@ class MempoolOptions {
 
     this.prefix = null;
     this.location = null;
-    this.db = 'memory';
+    this.memory = true;
     this.maxFiles = 64;
     this.cacheSize = 32 << 20;
     this.compression = true;
@@ -2091,9 +2091,9 @@ class MempoolOptions {
       this.location = options.location;
     }
 
-    if (options.db != null) {
-      assert(typeof options.db === 'string');
-      this.db = options.db;
+    if (options.memory != null) {
+      assert(typeof options.memory === 'boolean');
+      this.memory = options.memory;
     }
 
     if (options.maxFiles != null) {
@@ -2505,7 +2505,7 @@ class MempoolCache {
 
   async init(hash) {
     const batch = this.db.batch();
-    batch.put(layout.v.build(), encoding.u32(MempoolCache.VERSION));
+    batch.put(layout.v.build(), fromU32(MempoolCache.VERSION));
     batch.put(layout.R.build(), Buffer.from(hash, 'hex'));
     await batch.write();
   }
@@ -2557,7 +2557,7 @@ class MempoolCache {
     for (const key of keys)
       batch.del(key);
 
-    batch.put(layout.v.build(), encoding.u32(MempoolCache.VERSION));
+    batch.put(layout.v.build(), fromU32(MempoolCache.VERSION));
     batch.put(layout.R.build(), Buffer.from(this.chain.tip.hash, 'hex'));
     batch.del(layout.F.build());
 
@@ -2629,6 +2629,12 @@ function useDesc(a) {
   return y > x;
 }
 
+function fromU32(num) {
+  const data = Buffer.allocUnsafe(4);
+  data.writeUInt32LE(num, 0, true);
+  return data;
+}
+
 /*
  * Expose
  */
diff --git a/lib/net/hostlist.js b/lib/net/hostlist.js
index ae54131f..64bd0dc5 100644
--- a/lib/net/hostlist.js
+++ b/lib/net/hostlist.js
@@ -131,7 +131,7 @@ class HostList {
    */
 
   start() {
-    if (!this.options.persistent)
+    if (this.options.memory)
       return;
 
     if (!this.options.filename)
@@ -146,7 +146,7 @@ class HostList {
    */
 
   stop() {
-    if (!this.options.persistent)
+    if (this.options.memory)
       return;
 
     if (!this.options.filename)
@@ -194,7 +194,7 @@ class HostList {
     if (fs.unsupported)
       return;
 
-    if (!this.options.persistent)
+    if (this.options.memory)
       return;
 
     if (!filename)
@@ -226,7 +226,7 @@ class HostList {
     if (fs.unsupported)
       return;
 
-    if (!this.options.persistent)
+    if (this.options.memory)
       return;
 
     if (!filename)
@@ -1496,7 +1496,7 @@ class HostListOptions {
 
     this.prefix = null;
     this.filename = null;
-    this.persistent = false;
+    this.memory = true;
     this.flushInterval = 120000;
 
     if (options)
@@ -1590,9 +1590,9 @@ class HostListOptions {
       this.maxEntries = options.maxEntries;
     }
 
-    if (options.persistent != null) {
-      assert(typeof options.persistent === 'boolean');
-      this.persistent = options.persistent;
+    if (options.memory != null) {
+      assert(typeof options.memory === 'boolean');
+      this.memory = options.memory;
     }
 
     if (options.prefix != null) {
diff --git a/lib/net/pool.js b/lib/net/pool.js
index db44dc72..5d22a047 100644
--- a/lib/net/pool.js
+++ b/lib/net/pool.js
@@ -3635,7 +3635,7 @@ class PoolOptions {
     this.blockMode = 0;
     this.services = common.LOCAL_SERVICES;
     this.requiredServices = common.REQUIRED_SERVICES;
-    this.persistent = false;
+    this.memory = true;
 
     this.fromOptions(options);
   }
@@ -3866,9 +3866,9 @@ class PoolOptions {
       this.blockMode = options.blockMode;
     }
 
-    if (options.persistent != null) {
-      assert(typeof options.persistent === 'boolean');
-      this.persistent = options.persistent;
+    if (options.memory != null) {
+      assert(typeof options.memory === 'boolean');
+      this.memory = options.memory;
     }
 
     if (this.spv) {
diff --git a/lib/node/fullnode.js b/lib/node/fullnode.js
index e30788e5..24b36ccc 100644
--- a/lib/node/fullnode.js
+++ b/lib/node/fullnode.js
@@ -45,7 +45,7 @@ class FullNode extends Node {
       network: this.network,
       logger: this.logger,
       workers: this.workers,
-      db: this.config.str('db'),
+      memory: this.config.bool('memory'),
       prefix: this.config.prefix,
       maxFiles: this.config.uint('max-files'),
       cacheSize: this.config.mb('cache-size'),
@@ -71,7 +71,7 @@ class FullNode extends Node {
       workers: this.workers,
       chain: this.chain,
       fees: this.fees,
-      db: this.config.str('db'),
+      memory: this.config.bool('memory'),
       prefix: this.config.prefix,
       persistent: this.config.bool('persistent-mempool'),
       maxSize: this.config.mb('mempool-size'),
@@ -110,7 +110,7 @@ class FullNode extends Node {
       host: this.config.str('host'),
       port: this.config.uint('port'),
       listen: this.config.bool('listen'),
-      persistent: this.config.bool('persistent')
+      memory: this.config.bool('memory')
     });
 
     // Miner needs access to the chain and mempool.
diff --git a/lib/node/node.js b/lib/node/node.js
index 2adc456d..a9007171 100644
--- a/lib/node/node.js
+++ b/lib/node/node.js
@@ -47,6 +47,7 @@ class Node extends EventEmitter {
       this.config.open(config);
 
     this.network = Network.get(this.config.getSuffix());
+    this.memory = this.config.bool('memory', true);
     this.startTime = -1;
     this.bound = [];
     this.plugins = Object.create(null);
@@ -81,7 +82,7 @@ class Node extends EventEmitter {
       logger = config.obj('logger');
 
     logger.set({
-      filename: config.bool('log-file')
+      filename: !this.memory && config.bool('log-file')
         ? config.location(file)
         : null,
       level: config.str('log-level'),
@@ -131,6 +132,9 @@ class Node extends EventEmitter {
     if (fs.unsupported)
       return undefined;
 
+    if (this.memory)
+      return undefined;
+
     return fs.mkdirp(this.config.prefix);
   }
 
diff --git a/lib/node/spvnode.js b/lib/node/spvnode.js
index 29c589dd..fa477f18 100644
--- a/lib/node/spvnode.js
+++ b/lib/node/spvnode.js
@@ -45,8 +45,8 @@ class SPVNode extends Node {
     this.chain = new Chain({
       network: this.network,
       logger: this.logger,
-      db: this.config.str('db'),
       prefix: this.config.prefix,
+      memory: this.config.bool('memory'),
       maxFiles: this.config.uint('max-files'),
       cacheSize: this.config.mb('cache-size'),
       entryCache: this.config.uint('entry-cache'),
@@ -73,7 +73,7 @@ class SPVNode extends Node {
       identityKey: this.config.buf('identity-key'),
       maxOutbound: this.config.uint('max-outbound'),
       createSocket: this.config.func('create-socket'),
-      persistent: this.config.bool('persistent'),
+      memory: this.config.bool('memory'),
       selfish: true,
       listen: false
     });
diff --git a/lib/wallet/plugin.js b/lib/wallet/plugin.js
index 47f31cd8..b2fbb870 100644
--- a/lib/wallet/plugin.js
+++ b/lib/wallet/plugin.js
@@ -47,7 +47,7 @@ class Plugin extends EventEmitter {
       workers: node.workers,
       client: this.client,
       prefix: config.prefix,
-      db: config.str(['wallet-db', 'db']),
+      memory: config.bool(['wallet-memory', 'memory']),
       maxFiles: config.uint('wallet-max-files'),
       cacheSize: config.mb('wallet-cache-size'),
       witness: config.bool('wallet-witness'),
diff --git a/lib/wallet/server.js b/lib/wallet/server.js
index a252c5a9..2cd97f21 100644
--- a/lib/wallet/server.js
+++ b/lib/wallet/server.js
@@ -45,7 +45,7 @@ class WalletNode extends Node {
       workers: this.workers,
       client: this.client,
       prefix: this.config.prefix,
-      db: this.config.str('db'),
+      memory: this.config.bool('memory'),
       maxFiles: this.config.uint('max-files'),
       cacheSize: this.config.mb('cache-size'),
       witness: this.config.bool('witness'),
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index 32f30995..b259bbf8 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -239,7 +239,7 @@ class WalletDB extends EventEmitter {
       this.unregister(wallet);
     }
 
-    await this.db.close();
+    return this.db.close();
   }
 
   /**
@@ -1891,7 +1891,8 @@ class WalletDB extends EventEmitter {
       return 0;
     }
 
-    this.logger.debug('Adding block: %d.', entry.height);
+    if (tip.height >= this.network.block.slowHeight)
+      this.logger.debug('Adding block: %d.', tip.height);
 
     if (tip.height === this.state.height) {
       // We let blocks of the same height
@@ -2137,7 +2138,7 @@ class WalletOptions {
 
     this.prefix = null;
     this.location = null;
-    this.db = 'memory';
+    this.memory = true;
     this.maxFiles = 64;
     this.cacheSize = 16 << 20;
     this.compression = true;
@@ -2186,7 +2187,7 @@ class WalletOptions {
     if (options.prefix != null) {
       assert(typeof options.prefix === 'string');
       this.prefix = options.prefix;
-      this.location = path.join(this.prefix, 'walletdb');
+      this.location = path.join(this.prefix, 'wallet');
     }
 
     if (options.location != null) {
@@ -2194,9 +2195,9 @@ class WalletOptions {
       this.location = options.location;
     }
 
-    if (options.db != null) {
-      assert(typeof options.db === 'string');
-      this.db = options.db;
+    if (options.memory != null) {
+      assert(typeof options.memory === 'boolean');
+      this.memory = options.memory;
     }
 
     if (options.maxFiles != null) {
diff --git a/migrate/chaindb2to3.js b/migrate/chaindb2to3.js
index 94853469..3e685d22 100644
--- a/migrate/chaindb2to3.js
+++ b/migrate/chaindb2to3.js
@@ -29,7 +29,6 @@ const Block = require('../lib/primitives/block');
 const LRU = require('../lib/utils/lru');
 const consensus = require('../lib/protocol/consensus');
 
-const file = process.argv[2].replace(/\.ldb\/?$/, '');
 const shouldPrune = process.argv.indexOf('--prune') !== -1;
 
 let hasIndex = false;
@@ -37,8 +36,7 @@ let hasPruned = false;
 let hasSPV = false;
 
 const db = bdb.create({
-  location: file,
-  db: 'leveldb',
+  location: process.argv[2],
   compression: true,
   cacheSize: 32 << 20,
   createIfMissing: false
@@ -77,12 +75,12 @@ async function readJournal() {
   if (!data)
     return [STATE_VERSION, consensus.NULL_HASH];
 
-  if (data[0] !== MIGRATION_ID)
-    throw new Error('Bad migration id.');
-
   if (data.length !== 34)
     throw new Error('Bad migration length.');
 
+  if (data[0] !== MIGRATION_ID)
+    throw new Error('Bad migration id.');
+
   const state = data.readUInt8(1, true);
   const hash = data.toString('hex', 2, 34);
 
@@ -125,6 +123,7 @@ async function updateVersion() {
 
 async function reserializeUndo(hash) {
   let tip = await getTip();
+
   const height = tip.height;
 
   if (hash !== consensus.NULL_HASH)
@@ -643,7 +642,7 @@ reserializeEntries;
 (async () => {
   await db.open();
 
-  console.log('Opened %s.', file);
+  console.log('Opened %s.', process.argv[2]);
 
   if (await isSPV())
     hasSPV = true;
@@ -690,7 +689,7 @@ reserializeEntries;
 
   assert(state === STATE_DONE);
 
-  console.log('Closing %s.', file);
+  console.log('Closing %s.', process.argv[2]);
 
   await db.close();
 
diff --git a/migrate/chaindb3to4.js b/migrate/chaindb3to4.js
index 5abcf609..3712a672 100644
--- a/migrate/chaindb3to4.js
+++ b/migrate/chaindb3to4.js
@@ -9,16 +9,12 @@ const layout = require('../lib/blockchain/layout');
 // deployment table v->D
 // C/T key format
 
-let file = process.argv[2];
+assert(process.argv.length > 2, 'Please pass in a database path.');
+
 let parent = null;
 
-assert(typeof file === 'string', 'Please pass in a database path.');
-
-file = file.replace(/\.ldb\/?$/, '');
-
 const db = bdb.create({
-  location: file,
-  db: 'leveldb',
+  location: process.argv[2],
   compression: true,
   cacheSize: 32 << 20,
   createIfMissing: false
@@ -144,7 +140,7 @@ function parseC(key) {
 (async () => {
   await db.open();
 
-  console.log('Opened %s.', file);
+  console.log('Opened %s.', process.argv[2]);
 
   parent = db.batch();
 
diff --git a/migrate/walletdb5to6.js b/migrate/walletdb5to6.js
index fec21ea6..3757ef64 100644
--- a/migrate/walletdb5to6.js
+++ b/migrate/walletdb5to6.js
@@ -4,23 +4,19 @@ const assert = require('assert');
 const bdb = require('bdb');
 const bio = require('bufio');
 
-let file = process.argv[2];
+assert(process.argv.length > 2, 'Please pass in a database path.');
+
 let batch;
 
-assert(typeof file === 'string', 'Please pass in a database path.');
-
-file = file.replace(/\.ldb\/?$/, '');
-
 const db = bdb.create({
-  location: file,
-  db: 'leveldb',
+  location: process.argv[2],
   compression: true,
   cacheSize: 32 << 20,
   createIfMissing: false
 });
 
 async function updateVersion() {
-  const bak = `${process.env.HOME}/walletdb-bak-${Date.now()}.ldb`;
+  const bak = `${process.env.HOME}/wallet-bak-${Date.now()}`;
 
   console.log('Checking version.');
 
@@ -214,7 +210,7 @@ async function updateLookahead() {
   const db = new WalletDB({
     network: process.argv[3],
     db: 'leveldb',
-    location: file,
+    location: process.argv[2],
     witness: false,
     useCheckpoints: false,
     maxFiles: 64,
@@ -248,7 +244,7 @@ async function unstate() {
 (async () => {
   await db.open();
   batch = db.batch();
-  console.log('Opened %s.', file);
+  console.log('Opened %s.', process.argv[2]);
   await updateVersion();
   await wipeTXDB();
   await patchAccounts();
diff --git a/migrate/walletdb6to7.js b/migrate/walletdb6to7.js
index b2372658..2c19b3fd 100644
--- a/migrate/walletdb6to7.js
+++ b/migrate/walletdb6to7.js
@@ -24,23 +24,19 @@ const tlayout = layouts.txdb;
 // depth - counter record
 // hash/ascii - variable length key prefixes
 
-let file = process.argv[2];
 let parent = null;
 
-assert(typeof file === 'string', 'Please pass in a database path.');
-
-file = file.replace(/\.ldb\/?$/, '');
+assert(process.argv.length > 2, 'Please pass in a database path.');
 
 const db = bdb.create({
-  location: file,
-  db: 'leveldb',
+  location: process.argv[2],
   compression: true,
   cacheSize: 32 << 20,
   createIfMissing: false
 });
 
 async function updateVersion() {
-  const bak = `${process.env.HOME}/walletdb-bak-${Date.now()}.ldb`;
+  const bak = `${process.env.HOME}/wallet-bak-${Date.now()}`;
 
   console.log('Checking version.');
 
@@ -906,7 +902,7 @@ function parsei(key) { // i[wid][name]
 (async () => {
   await db.open();
 
-  console.log('Opened %s.', file);
+  console.log('Opened %s.', process.argv[2]);
 
   parent = db.batch();