diff --git a/lib/hd/hd.js b/lib/hd/hd.js
index 31d7be93..ce200a51 100644
--- a/lib/hd/hd.js
+++ b/lib/hd/hd.js
@@ -20,13 +20,14 @@ var HD = exports;
 /**
  * Instantiate an HD key (public or private) from an base58 string.
  * @param {Base58String} xkey
+ * @param {Network?} network
  * @returns {HDPrivateKey|HDPublicKey}
  */
 
-HD.fromBase58 = function fromBase58(xkey) {
+HD.fromBase58 = function fromBase58(xkey, network) {
   if (HDPrivateKey.isBase58(xkey))
-    return HDPrivateKey.fromBase58(xkey);
-  return HDPublicKey.fromBase58(xkey);
+    return HDPrivateKey.fromBase58(xkey, network);
+  return HDPublicKey.fromBase58(xkey, network);
 };
 
 /**
@@ -68,13 +69,14 @@ HD.fromMnemonic = function fromMnemonic(options, network) {
 /**
  * Instantiate an HD key from a jsonified key object.
  * @param {Object} json - The jsonified transaction object.
+ * @param {Network?} network
  * @returns {HDPrivateKey|HDPublicKey}
  */
 
-HD.fromJSON = function fromJSON(json) {
+HD.fromJSON = function fromJSON(json, network) {
   if (json.xprivkey)
-    return HDPrivateKey.fromJSON(json);
-  return HDPublicKey.fromJSON(json);
+    return HDPrivateKey.fromJSON(json, network);
+  return HDPublicKey.fromJSON(json, network);
 };
 
 /**
@@ -116,7 +118,7 @@ HD.from = function from(options, network) {
     return options;
 
   if (HD.isBase58(options))
-    return HD.fromBase58(options);
+    return HD.fromBase58(options, network);
 
   if (HD.isRaw(options))
     return HD.fromRaw(options);
diff --git a/lib/hd/private.js b/lib/hd/private.js
index e8c6f5d1..16a70cb6 100644
--- a/lib/hd/private.js
+++ b/lib/hd/private.js
@@ -615,11 +615,14 @@ HDPrivateKey.generate = function generate(network) {
  * Inject properties from base58 key.
  * @private
  * @param {Base58String} xkey
+ * @param {Network?} network
  */
 
-HDPrivateKey.prototype.fromBase58 = function fromBase58(xkey) {
+HDPrivateKey.prototype.fromBase58 = function fromBase58(xkey, network) {
   this.fromRaw(base58.decode(xkey));
   this._xprivkey = xkey;
+  if (network && !this.verifyNetwork(network))
+    throw new Error('Network mismatch for HD private key.');
   return this;
 };
 
@@ -813,11 +816,12 @@ HDPrivateKey.fromExtended = function fromExtended(data) {
 /**
  * Instantiate an HD private key from a base58 string.
  * @param {Base58String} xkey
+ * @param {Network?} network
  * @returns {HDPrivateKey}
  */
 
-HDPrivateKey.fromBase58 = function fromBase58(xkey) {
-  return new HDPrivateKey().fromBase58(xkey);
+HDPrivateKey.fromBase58 = function fromBase58(xkey, network) {
+  return new HDPrivateKey().fromBase58(xkey, network);
 };
 
 /**
@@ -856,12 +860,13 @@ HDPrivateKey.prototype.toJSON = function toJSON() {
  * Inject properties from json object.
  * @private
  * @param {Object} json
+ * @param {Network?} network
  */
 
-HDPrivateKey.prototype.fromJSON = function fromJSON(json) {
+HDPrivateKey.prototype.fromJSON = function fromJSON(json, network) {
   assert(json.xprivkey, 'Could not handle key JSON.');
 
-  this.fromBase58(json.xprivkey);
+  this.fromBase58(json.xprivkey, network);
 
   if (json.mnemonic)
     this.mnemonic = Mnemonic.fromJSON(json.mnemonic);
@@ -872,11 +877,12 @@ HDPrivateKey.prototype.fromJSON = function fromJSON(json) {
 /**
  * Instantiate an HDPrivateKey from a jsonified key object.
  * @param {Object} json - The jsonified key object.
+ * @param {Network?} network
  * @returns {HDPrivateKey}
  */
 
-HDPrivateKey.fromJSON = function fromJSON(json) {
-  return new HDPrivateKey().fromJSON(json);
+HDPrivateKey.fromJSON = function fromJSON(json, network) {
+  return new HDPrivateKey().fromJSON(json, network);
 };
 
 /**
diff --git a/lib/hd/public.js b/lib/hd/public.js
index 4746b4a5..f6141c1d 100644
--- a/lib/hd/public.js
+++ b/lib/hd/public.js
@@ -409,22 +409,24 @@ HDPublicKey.prototype.toJSON = function toJSON() {
  * Inject properties from json object.
  * @private
  * @param {Object} json
+ * @param {Network?} network
  */
 
-HDPublicKey.prototype.fromJSON = function fromJSON(json) {
+HDPublicKey.prototype.fromJSON = function fromJSON(json, network) {
   assert(json.xpubkey, 'Could not handle HD key JSON.');
-  this.fromBase58(json.xpubkey);
+  this.fromBase58(json.xpubkey, network);
   return this;
 };
 
 /**
- * Instantiate an HDPrivateKey from a jsonified key object.
+ * Instantiate an HDPublicKey from a jsonified key object.
  * @param {Object} json - The jsonified transaction object.
+ * @param {Network?} network
  * @returns {HDPrivateKey}
  */
 
-HDPublicKey.fromJSON = function fromJSON(json) {
-  return new HDPublicKey().fromJSON(json);
+HDPublicKey.fromJSON = function fromJSON(json, network) {
+  return new HDPublicKey().fromJSON(json, network);
 };
 
 /**
@@ -477,11 +479,14 @@ HDPublicKey.isRaw = function isRaw(data) {
  * Inject properties from a base58 key.
  * @private
  * @param {Base58String} xkey
+ * @param {Network?} network
  */
 
-HDPublicKey.prototype.fromBase58 = function fromBase58(xkey) {
+HDPublicKey.prototype.fromBase58 = function fromBase58(xkey, network) {
   this.fromRaw(base58.decode(xkey));
   this._xpubkey = xkey;
+  if (network && !this.verifyNetwork(network))
+    throw new Error('Network mismatch for HD public key.');
   return this;
 };
 
@@ -581,11 +586,12 @@ HDPublicKey.prototype.toRaw = function toRaw(network) {
 /**
  * Instantiate an HD public key from a base58 string.
  * @param {Base58String} xkey
+ * @param {Network?} network
  * @returns {HDPublicKey}
  */
 
-HDPublicKey.fromBase58 = function fromBase58(xkey) {
-  return new HDPublicKey().fromBase58(xkey);
+HDPublicKey.fromBase58 = function fromBase58(xkey, network) {
+  return new HDPublicKey().fromBase58(xkey, network);
 };
 
 /**
diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 844f5f89..a2927ce7 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -2055,7 +2055,7 @@ RPC.prototype._generatetoaddress = co(function* generatetoaddress(args, help) {
     throw new RPCError('generatetoaddress numblocks address ( maxtries )');
 
   numblocks = toNumber(args[0], 1);
-  address = Address.fromBase58(toString(args[1]));
+  address = Address.fromBase58(toString(args[1]), this.network);
 
   return yield this._generateBlocks(numblocks, address);
 });
@@ -2137,7 +2137,7 @@ RPC.prototype.createrawtransaction = co(function* createrawtransaction(args, hel
       continue;
     }
 
-    address = Address.fromBase58(key);
+    address = Address.fromBase58(key, this.network);
     b58 = address.toBase58(this.network);
 
     if (addrs[b58])
@@ -2270,7 +2270,7 @@ RPC.prototype._signrawtransaction = co(function* signrawtransaction(wallet, tx,
       if (typeof secret !== 'string')
         throw new RPCError('Invalid parameter');
 
-      key = KeyRing.fromSecret(secret);
+      key = KeyRing.fromSecret(secret, this.network);
       keyMap[key.getPublicKey('hex')] = key;
       keys.push(key);
     }
@@ -2375,7 +2375,7 @@ RPC.prototype.fundrawtransaction = co(function* fundrawtransaction(args, help) {
     changeAddress = toString(options.changeAddress);
 
     if (changeAddress)
-      changeAddress = Address.fromBase58(changeAddress);
+      changeAddress = Address.fromBase58(changeAddress, this.network);
 
     feeRate = options.feeRate;
 
@@ -2494,7 +2494,7 @@ RPC.prototype.validateaddress = co(function* validateaddress(args, help) {
   b58 = toString(args[0]);
 
   try {
-    address = Address.fromBase58(b58);
+    address = Address.fromBase58(b58, this.network);
   } catch (e) {
     return {
       isvalid: false
@@ -2561,7 +2561,7 @@ RPC.prototype.signmessagewithprivkey = co(function* signmessagewithprivkey(args,
   key = toString(args[0]);
   msg = toString(args[1]);
 
-  key = KeyRing.fromSecret(key);
+  key = KeyRing.fromSecret(key, this.network);
   msg = new Buffer(RPC.magic + msg, 'utf8');
   msg = crypto.hash256(msg);
 
@@ -3242,7 +3242,7 @@ RPC.prototype.importprivkey = co(function* importprivkey(args, help) {
   if (rescan && this.chain.options.prune)
     throw new RPCError('Cannot rescan when pruned.');
 
-  key = KeyRing.fromSecret(secret);
+  key = KeyRing.fromSecret(secret, this.network);
 
   yield wallet.importKey(0, key);
 
@@ -3291,7 +3291,7 @@ RPC.prototype.importwallet = co(function* importwallet(args, help) {
     if (parts.length < 4)
       throw new RPCError('Malformed wallet.');
 
-    secret = KeyRing.fromSecret(parts[0]);
+    secret = KeyRing.fromSecret(parts[0], this.network);
 
     time = +parts[1];
     label = parts[2];
@@ -3332,7 +3332,7 @@ RPC.prototype.importaddress = co(function* importaddress(args, help) {
   if (rescan && this.chain.options.prune)
     throw new RPCError('Cannot rescan when pruned.');
 
-  addr = Address.fromBase58(addr);
+  addr = Address.fromBase58(addr, this.network);
 
   yield wallet.importAddress(0, addr);
 
@@ -3888,7 +3888,7 @@ RPC.prototype.sendfrom = co(function* sendfrom(args, help) {
   }
 
   account = toString(args[0]);
-  address = Address.fromBase58(toString(args[1]));
+  address = Address.fromBase58(toString(args[1]), this.network);
   amount = toSatoshi(args[2]);
 
   if (!account)
@@ -3940,7 +3940,7 @@ RPC.prototype.sendmany = co(function* sendmany(args, help) {
   for (i = 0; i < keys.length; i++) {
     key = keys[i];
     value = toSatoshi(sendTo[key]);
-    address = Address.fromBase58(key);
+    address = Address.fromBase58(key, this.network);
     hash = address.getHash('hex');
 
     if (uniq[hash])
@@ -3976,7 +3976,7 @@ RPC.prototype.sendtoaddress = co(function* sendtoaddress(args, help) {
       + ' subtractfeefromamount )');
   }
 
-  address = Address.fromBase58(toString(args[0]));
+  address = Address.fromBase58(toString(args[0]), this.network);
   amount = toSatoshi(args[1]);
   subtractFee = toBool(args[4]);
 
diff --git a/lib/http/server.js b/lib/http/server.js
index d1d8ee0f..e2950df4 100644
--- a/lib/http/server.js
+++ b/lib/http/server.js
@@ -345,7 +345,7 @@ HTTPServer.prototype._init = function _init() {
     if (params.accountKey) {
       enforce(typeof params.accountKey === 'string',
         'accountKey must be a string.');
-      options.accountKey = HD.fromBase58(params.accountKey);
+      options.accountKey = HD.fromBase58(params.accountKey, this.network);
     }
 
     if (params.timeout != null) {
@@ -371,9 +371,7 @@ HTTPServer.prototype._init = function _init() {
         if (output.address) {
           enforce(typeof output.address === 'string',
             'Address must be a string.');
-          output.address = Address.fromBase58(output.address);
-          enforce(output.address.verifyNetwork(this.network),
-            'Wrong network for address.');
+          output.address = Address.fromBase58(output.address, this.network);
         } else if (output.script) {
           enforce(typeof output.script === 'string',
             'Script must be a string.');
@@ -396,13 +394,13 @@ HTTPServer.prototype._init = function _init() {
         for (i = 0; i < params.address.length; i++) {
           address = params.address[i];
           enforce(typeof address === 'string', 'Address must be a string.');
-          address = Address.fromBase58(address);
+          address = Address.fromBase58(address, this.network);
           options.address.push(address);
         }
       } else {
         enforce(typeof params.address === 'string',
           'Address must be a string.');
-        options.address = Address.fromBase58(params.address);
+        options.address = Address.fromBase58(params.address, this.network);
       }
     }
 
@@ -439,7 +437,7 @@ HTTPServer.prototype._init = function _init() {
 
     if (params.privateKey) {
       enforce(typeof params.privateKey === 'string', 'Key must be a string.');
-      options.privateKey = KeyRing.fromSecret(params.privateKey);
+      options.privateKey = KeyRing.fromSecret(params.privateKey, this.network);
     }
 
     if (params.publicKey) {
@@ -450,7 +448,7 @@ HTTPServer.prototype._init = function _init() {
 
     if (params.master) {
       enforce(typeof params.master === 'string', 'Key must be a string.');
-      options.master = HD.fromBase58(params.master);
+      options.master = HD.fromBase58(params.master, this.network);
     }
 
     if (params.mnemonic) {
diff --git a/lib/primitives/address.js b/lib/primitives/address.js
index 4f046cda..d5251cd5 100644
--- a/lib/primitives/address.js
+++ b/lib/primitives/address.js
@@ -284,23 +284,31 @@ Address.fromRaw = function fromRaw(data) {
  * Inject properties from base58 address.
  * @private
  * @param {Base58Address} data
+ * @param {Network?} network
  * @throws Parse error
  */
 
-Address.prototype.fromBase58 = function fromBase58(data) {
+Address.prototype.fromBase58 = function fromBase58(data, network) {
   assert(typeof data === 'string');
-  return this.fromRaw(base58.decode(data));
+
+  this.fromRaw(base58.decode(data));
+
+  if (network && !this.verifyNetwork(network))
+    throw new Error('Network mismatch for address.');
+
+  return this;
 };
 
 /**
  * Create an address object from a base58 address.
  * @param {Base58Address} address
+ * @param {Network?} network
  * @returns {Address}
  * @throws Parse error.
  */
 
-Address.fromBase58 = function fromBase58(address) {
-  return new Address().fromBase58(address);
+Address.fromBase58 = function fromBase58(address, network) {
+  return new Address().fromBase58(address, network);
 };
 
 /**
diff --git a/lib/primitives/keyring.js b/lib/primitives/keyring.js
index d9bba9d5..c78e1a11 100644
--- a/lib/primitives/keyring.js
+++ b/lib/primitives/keyring.js
@@ -323,9 +323,10 @@ KeyRing.prototype.toSecret = function toSecret() {
  * Inject properties from serialized CBitcoinSecret.
  * @private
  * @param {Base58String} secret
+ * @param {Network?} network
  */
 
-KeyRing.prototype.fromSecret = function fromSecret(data) {
+KeyRing.prototype.fromSecret = function fromSecret(data, network) {
   var br = new BufferReader(base58.decode(data), true);
   var i, prefix, version, type, key, compressed;
 
@@ -351,17 +352,23 @@ KeyRing.prototype.fromSecret = function fromSecret(data) {
 
   br.verifyChecksum();
 
-  return this.fromPrivate(key, compressed, type);
+  this.fromPrivate(key, compressed, type);
+
+  if (network && !this.verifyNetwork(network))
+    throw new Error('Network mismatch for WIF.');
+
+  return this;
 };
 
 /**
  * Instantiate a keyring from a serialized CBitcoinSecret.
  * @param {Base58String} secret
+ * @param {Network?} network
  * @returns {KeyRing}
  */
 
-KeyRing.fromSecret = function fromSecret(data) {
-  return new KeyRing().fromSecret(data);
+KeyRing.fromSecret = function fromSecret(data, network) {
+  return new KeyRing().fromSecret(data, network);
 };
 
 /**
diff --git a/lib/wallet/account.js b/lib/wallet/account.js
index cba6c54f..10c20724 100644
--- a/lib/wallet/account.js
+++ b/lib/wallet/account.js
@@ -280,7 +280,7 @@ Account.prototype.pushKey = function pushKey(key) {
   var index;
 
   if (HD.isBase58(key))
-    key = HD.fromBase58(key);
+    key = HD.fromBase58(key, this.network);
 
   assert(key.verifyNetwork(this.network),
     'Network mismatch for account key.');
@@ -320,7 +320,7 @@ Account.prototype.pushKey = function pushKey(key) {
 
 Account.prototype.spliceKey = function spliceKey(key) {
   if (HD.isBase58(key))
-    key = HD.fromBase58(key);
+    key = HD.fromBase58(key, this.network);
 
   assert(key.verifyNetwork(this.network),
     'Network mismatch for account key.');
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index df8a97ac..979be82e 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -111,7 +111,7 @@ Wallet.prototype.fromOptions = function fromOptions(options) {
       key = HD.fromMnemonic(null, this.network);
 
     if (HD.isBase58(key))
-      key = HD.fromBase58(key);
+      key = HD.fromBase58(key, this.network);
 
     assert(HD.isPrivate(key),
       'Must create wallet with hd private key.');
@@ -697,7 +697,7 @@ Wallet.prototype._createAccount = co(function* createAccount(options, passphrase
     key = options.accountKey;
 
     if (HD.isBase58(key))
-      key = HD.fromBase58(key);
+      key = HD.fromBase58(key, this.network);
 
     if (!HD.isPublic(key))
       throw new Error('Must add HD public keys to watch only wallet.');
diff --git a/lib/wallet/walletkey.js b/lib/wallet/walletkey.js
index 24ee2b94..e94685eb 100644
--- a/lib/wallet/walletkey.js
+++ b/lib/wallet/walletkey.js
@@ -106,11 +106,12 @@ WalletKey.fromScript = function fromScript(key, script, compressed, network) {
 /**
  * Instantiate a wallet key from a serialized CBitcoinSecret.
  * @param {Base58String} secret
+ * @param {Network?} network
  * @returns {WalletKey}
  */
 
-WalletKey.fromSecret = function fromSecret(data) {
-  return new WalletKey().fromSecret(data);
+WalletKey.fromSecret = function fromSecret(data, network) {
+  return new WalletKey().fromSecret(data, network);
 };
 
 /**