diff --git a/lib/bcoin/keyring.js b/lib/bcoin/keyring.js
index 20013f49..863e5570 100644
--- a/lib/bcoin/keyring.js
+++ b/lib/bcoin/keyring.js
@@ -73,49 +73,73 @@ function KeyRing(options) {
 KeyRing.prototype.fromOptions = function fromOptions(options) {
   var i;
 
+  assert(options.key);
+
   if (options.network)
     this.network = bcoin.network.get(options.network);
 
-  if (options.type)
+  if (options.type) {
+    assert(options.type === 'pubkeyhash' || options.type === 'multisig');
     this.type = options.type;
+  }
 
-  if (options.m)
+  if (options.m != null) {
+    assert(utils.isNumber(options.m));
     this.m = options.m;
+  }
 
-  if (options.n)
+  if (options.n != null) {
+    assert(utils.isNumber(options.n));
     this.n = options.n;
+  }
 
-  if (options.witness != null)
+  if (options.witness != null) {
+    assert(typeof options.witness === 'boolean');
     this.witness = options.witness;
+  }
 
-  if (options.id)
+  if (options.id) {
+    assert(utils.isAlpha(options.id));
     this.id = options.id;
+  }
 
-  if (options.name)
+  if (options.name) {
+    assert(utils.isAlpha(options.name));
     this.name = options.name;
+  }
 
-  if (options.account != null)
+  if (options.account != null) {
+    assert(utils.isNumber(options.account));
     this.account = options.account;
+  }
 
-  if (options.change != null)
+  if (options.change != null) {
+    assert(utils.isNumber(options.change));
     this.change = options.change;
+  }
 
-  if (options.index != null)
+  if (options.index != null) {
+    assert(utils.isNumber(options.index));
     this.index = options.index;
+  }
 
   this.key = options.key;
 
+  if (this.key.getPublicKey)
+    this.key = this.key.getPublicKey();
+
+  assert(Buffer.isBuffer(this.key));
+
   if (this.n > 1)
     this.type = 'multisig';
 
-  assert(this.type === 'pubkeyhash' || this.type === 'multisig');
-
   if (this.m < 1 || this.m > this.n)
     throw new Error('m ranges between 1 and n');
 
   this.addKey(this.key);
 
   if (options.keys) {
+    assert(Array.isArray(options.keys));
     for (i = 0; i < options.keys.length; i++)
       this.addKey(options.keys[i]);
   }
@@ -139,6 +163,8 @@ KeyRing.fromOptions = function fromOptions(options) {
  */
 
 KeyRing.prototype.addKey = function addKey(key) {
+  assert(Buffer.isBuffer(key));
+
   if (utils.indexOf(this.keys, key) !== -1)
     return;
 
@@ -154,6 +180,8 @@ KeyRing.prototype.addKey = function addKey(key) {
  */
 
 KeyRing.prototype.removeKey = function removeKey(key) {
+  assert(Buffer.isBuffer(key));
+
   if (this.keys.length === this.n)
     throw new Error('Cannot remove key.');
 
@@ -639,12 +667,12 @@ KeyRing.prototype.fromJSON = function fromJSON(json) {
 
   assert(json);
   assert(typeof json.network === 'string');
-  assert(typeof json.type === 'string');
+  assert(json.type === 'pubkeyhash' || json.type === 'multisig');
   assert(utils.isNumber(json.m));
   assert(utils.isNumber(json.n));
   assert(typeof json.witness === 'boolean');
-  assert(!json.id || typeof json.id === 'string');
-  assert(!json.name || typeof json.name === 'string');
+  assert(!json.id || utils.isAlpha(json.id));
+  assert(!json.name || utils.isAlpha(json.name));
   assert(utils.isNumber(json.account));
   assert(utils.isNumber(json.change));
   assert(utils.isNumber(json.index));
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index c6483cbc..75e63637 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -2621,3 +2621,17 @@ utils.mkdir = function mkdir(path, dirname) {
  */
 
 utils._paths = {};
+
+/**
+ * Test whether a string is alphanumeric
+ * enough to use as a leveldb key.
+ * @param {String} key
+ * @returns {Boolean}
+ */
+
+utils.isAlpha = function isAlpha(key) {
+  if (typeof key !== 'string')
+    return false;
+  // We allow /-~ (exclusive), 0-} (inclusive)
+  return /^[\u0030-\u007d]+$/.test(key);
+};
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 4dadede7..822efd95 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -83,9 +83,24 @@ Wallet.prototype.fromOptions = function fromOptions(options) {
     master = MasterKey.fromKey(master);
 
   this.master = master;
-  this.initialized = options.initialized || false;
-  this.accountDepth = options.accountDepth || 0;
-  this.id = options.id || this.getID();
+
+  if (options.initialized != null) {
+    assert(typeof options.initialized === 'boolean');
+    this.initialized = options.initialized;
+  }
+
+  if (options.accountDepth != null) {
+    assert(utils.isNumber(options.accountDepth));
+    this.accountDepth = options.accountDepth;
+  }
+
+  if (options.id) {
+    assert(utils.isAlpha(options.id), 'Wallet ID must be alphanumeric.');
+    this.id = options.id;
+  }
+
+  if (!this.id)
+    this.id = this.getID();
 
   return this;
 };
@@ -1452,11 +1467,16 @@ Wallet.prototype.toJSON = function toJSON() {
  */
 
 Wallet.prototype.fromJSON = function fromJSON(json) {
+  assert(utils.isAlpha(json.id), 'Wallet ID must be alphanumeric.');
+  assert(typeof json.initialized === 'boolean');
+  assert(utils.isNumber(json.accountDepth));
+
   this.network = bcoin.network.get(json.network);
   this.id = json.id;
   this.initialized = json.initialized;
   this.accountDepth = json.accountDepth;
   this.master = MasterKey.fromJSON(json.master);
+
   return this;
 };
 
@@ -1599,45 +1619,59 @@ Account.prototype.fromOptions = function fromOptions(options) {
   var i;
 
   assert(options, 'Options are required.');
-  assert(options.id, 'Wallet ID is required.');
-  assert(options.accountKey, 'Account key is required.');
+  assert(utils.isAlpha(options.id), 'Wallet ID must be alphanumeric.');
+  assert(utils.isAlpha(options.name), 'Account name must be alphanumeric.');
+  assert(bcoin.hd.isHD(options.accountKey), 'Account key is required.');
   assert(utils.isNumber(options.accountIndex), 'Account index is required.');
 
   this.id = options.id;
   this.name = options.name;
 
-  if (options.witness != null)
+  if (options.witness != null) {
+    assert(typeof options.witness === 'boolean');
     this.witness = options.witness;
+  }
 
   this.accountKey = options.accountKey;
 
-  if (options.accountIndex != null)
+  if (options.accountIndex != null) {
+    assert(utils.isNumber(options.accountIndex));
     this.accountIndex = options.accountIndex;
+  }
 
-  if (options.receiveDepth != null)
+  if (options.receiveDepth != null) {
+    assert(utils.isNumber(options.receiveDepth));
     this.receiveDepth = options.receiveDepth;
+  }
 
-  if (options.changeDepth != null)
+  if (options.changeDepth != null) {
+    assert(utils.isNumber(options.changeDepth));
     this.changeDepth = options.changeDepth;
+  }
 
-  if (options.type)
+  if (options.type) {
+    assert(options.type === 'pubkeyhash' || options.type === 'multisig');
     this.type = options.type;
+  }
 
-  if (options.m)
+  if (options.m != null) {
+    assert(utils.isNumber(options.m));
     this.m = options.m;
+  }
 
-  if (options.n)
+  if (options.n != null) {
+    assert(utils.isNumber(options.n));
     this.n = options.n;
+  }
 
-  if (options.initialized != null)
+  if (options.initialized != null) {
+    assert(typeof options.initialized === 'boolean');
     this.initialized = options.initialized;
+  }
 
   if (this.n > 1)
     this.type = 'multisig';
 
-  assert(this.type === 'pubkeyhash' || this.type === 'multisig',
-    '`type` must be multisig or pubkeyhash.');
-
   if (this.m < 1 || this.m > this.n)
     throw new Error('m ranges between 1 and n');
 
@@ -1647,6 +1681,7 @@ Account.prototype.fromOptions = function fromOptions(options) {
   this.pushKey(this.accountKey);
 
   if (options.keys) {
+    assert(Array.isArray(options.keys));
     for (i = 0; i < options.keys.length; i++)
       this.pushKey(options.keys[i]);
   }
@@ -2258,6 +2293,17 @@ Account.prototype.fromJSON = function fromJSON(json) {
   var i;
 
   assert.equal(json.network, this.network.type);
+  assert(utils.isAlpha(json.id), 'Wallet ID must be alphanumeric.');
+  assert(utils.isAlpha(json.name), 'Account name must be alphanumeric.');
+  assert(typeof json.initialized === 'boolean');
+  assert(json.type === 'pubkeyhash' || json.type === 'multisig');
+  assert(utils.isNumber(json.m));
+  assert(utils.isNumber(json.n));
+  assert(typeof json.witness === 'boolean');
+  assert(utils.isNumber(json.accountIndex));
+  assert(utils.isNumber(json.receiveDepth));
+  assert(utils.isNumber(json.changeDepth));
+  assert(Array.isArray(json.keys));
 
   this.id = json.id;
   this.name = json.name;
@@ -2405,10 +2451,27 @@ function MasterKey(options) {
  */
 
 MasterKey.prototype.fromOptions = function fromOptions(options) {
-  this.encrypted = !!options.encrypted;
-  this.iv = options.iv;
-  this.ciphertext = options.ciphertext;
-  this.key = options.key || null;
+  assert(options);
+
+  if (options.encrypted != null) {
+    assert(typeof options.encrypted === 'boolean');
+    this.encrypted = options.encrypted;
+  }
+
+  if (options.iv) {
+    assert(Buffer.isBuffer(options.iv));
+    this.iv = options.iv;
+  }
+
+  if (options.ciphertext) {
+    assert(Buffer.isBuffer(options.ciphertext));
+    this.ciphertext = options.ciphertext;
+  }
+
+  if (options.key) {
+    assert(Buffer.isBuffer(options.key));
+    this.key = options.key;
+  }
 
   assert(this.encrypted ? !this.key : this.key);
 
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index 54961a5b..4b67f413 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -468,7 +468,7 @@ WalletDB.prototype.get = function get(id, callback) {
  */
 
 WalletDB.prototype.save = function save(wallet, callback) {
-  if (!isAlpha(wallet.id))
+  if (!utils.isAlpha(wallet.id))
     return callback(new Error('Wallet IDs must be alphanumeric.'));
 
   this.db.put('w/' + wallet.id, wallet.toRaw(), callback);
@@ -664,7 +664,7 @@ WalletDB.prototype.getAccountIndex = function getAccountIndex(id, name, callback
 WalletDB.prototype.saveAccount = function saveAccount(account, callback) {
   var index, batch;
 
-  if (!isAlpha(account.name))
+  if (!utils.isAlpha(account.name))
     return callback(new Error('Account names must be alphanumeric.'));
 
   batch = this.db.batch();
@@ -1464,11 +1464,6 @@ function serializePaths(out) {
   return p.render();
 }
 
-function isAlpha(key) {
-  // We allow /-~ (exclusive), 0-} (inclusive)
-  return /^[\u0030-\u007d]+$/.test(key);
-}
-
 function ReadLock(parent) {
   if (!(this instanceof ReadLock))
     return new ReadLock(parent);