diff --git a/lib/bcoin/address.js b/lib/bcoin/address.js
index e2856908..45a0bb3f 100644
--- a/lib/bcoin/address.js
+++ b/lib/bcoin/address.js
@@ -38,7 +38,7 @@ function Address(options) {
   this.hash = null;
   this.type = null;
   this.version = null;
-  this.network = bcoin.network.get().type;
+  this.network = null;
 
   if (options)
     this.fromOptions(options);
@@ -78,10 +78,26 @@ Address.prototype.getHash = function getHash(enc) {
  */
 
 Address.prototype.toBase58 = function toBase58(network) {
+  var p = new BufferWriter();
+  var prefix;
+
   if (!network)
     network = this.network;
 
-  return Address.toBase58(this.hash, this.type, this.version, network);
+  network = bcoin.network.get(network);
+  prefix = network.address.prefixes[this.type];
+
+  assert(prefix != null, 'Not a valid address prefix.');
+
+  p.writeU8(prefix);
+  if (this.version !== -1) {
+    p.writeU8(this.version);
+    p.writeU8(0);
+  }
+  p.writeBytes(this.hash);
+  p.writeChecksum();
+
+  return utils.toBase58(p.render());
 };
 
 /**
@@ -115,53 +131,6 @@ Address.prototype.inspect = function inspect() {
     + '>';
 };
 
-/**
- * Compile a hash to an address.
- * @param {Hash|Buffer} hash
- * @param {AddressType?} type
- * @param {Number?} version - Witness version.
- * @returns {Base58Address}
- * @throws Error on bad hash/prefix.
- */
-
-Address.toBase58 = function toBase58(hash, type, version, network) {
-  var p, prefix;
-
-  if (typeof hash === 'string')
-    hash = new Buffer(hash, 'hex');
-
-  if (!type)
-    type = 'pubkeyhash';
-
-  network = bcoin.network.get(network);
-
-  prefix = network.address.prefixes[type];
-
-  if (!(version >= 0))
-    version = network.address.versions[type];
-
-  assert(prefix != null, 'Not a valid address prefix.');
-
-  if (!(version >= 0))
-    assert(hash.length === 20, 'Hash is the wrong size.');
-  else if (version === 0 && type === 'witnesspubkeyhash')
-    assert(hash.length === 20, 'Hash is the wrong size.');
-  else if (version === 0 && type === 'witnessscripthash')
-    assert(hash.length === 32, 'Hash is the wrong size.');
-
-  p = new BufferWriter();
-
-  p.writeU8(prefix);
-  if (version != null) {
-    p.writeU8(version);
-    p.writeU8(0);
-  }
-  p.writeBytes(hash);
-  p.writeChecksum();
-
-  return utils.toBase58(p.render());
-};
-
 /**
  * Parse a base58 address.
  * @param {Base58Address} address
@@ -170,7 +139,7 @@ Address.toBase58 = function toBase58(hash, type, version, network) {
  */
 
 Address.prototype.fromBase58 = function fromBase58(address) {
-  var i, prefix, type, version, hash, network, p;
+  var i, prefix, type, version, nversion, hash, network, p;
 
   if (typeof address === 'string')
     address = utils.fromBase58(address);
@@ -187,12 +156,17 @@ Address.prototype.fromBase58 = function fromBase58(address) {
 
   assert(type != null, 'Unknown address prefix.');
 
-  version = network.address.versions[type];
+  nversion = network.address.versions[type];
 
-  if (version != null) {
+  if (nversion == null)
+    nversion = -1;
+
+  if (nversion !== -1) {
     version = p.readU8();
     assert(version >= 0 && version <= 16, 'Bad program version.');
     assert(p.readU8() === 0, 'Address version padding is non-zero.');
+  } else {
+    version = -1;
   }
 
   if (type === 'witnessscripthash')
@@ -205,7 +179,7 @@ Address.prototype.fromBase58 = function fromBase58(address) {
   this.network = network.type;
   this.type = type;
   this.hash = hash;
-  this.version = version == null ? -1 : version;
+  this.version = version;
 
   return this;
 };
@@ -372,13 +346,37 @@ Address.fromScript = function fromScript(script) {
  */
 
 Address.prototype.fromHash = function fromHash(hash, type, version, network) {
+  var p, prefix, nversion;
+
   if (typeof hash === 'string')
     hash = new Buffer(hash, 'hex');
 
+  if (!type)
+    type = 'pubkeyhash';
+
+  if (version == null)
+    version = -1;
+
+  network = bcoin.network.get(network);
+  prefix = network.address.prefixes[type];
+  nversion = network.address.versions[type];
+
+  if (version === -1 && nversion != null)
+    version = nversion;
+
+  assert(prefix != null, 'Not a valid address prefix.');
+
+  if (version === -1)
+    assert(hash.length === 20, 'Hash is the wrong size.');
+  else if (version === 0 && type === 'witnesspubkeyhash')
+    assert(hash.length === 20, 'Hash is the wrong size.');
+  else if (version === 0 && type === 'witnessscripthash')
+    assert(hash.length === 32, 'Hash is the wrong size.');
+
   this.hash = hash;
-  this.type = type || 'pubkeyhash';
-  this.version = version == null ? -1 : version;
-  this.network = bcoin.network.get(network).type;
+  this.type = type;
+  this.version = version;
+  this.network = network.type;
 
   return this;
 };
diff --git a/lib/bcoin/coin.js b/lib/bcoin/coin.js
index 79aa5189..30aa98cf 100644
--- a/lib/bcoin/coin.js
+++ b/lib/bcoin/coin.js
@@ -61,11 +61,11 @@ Coin.prototype.fromOptions = function fromOptions(options) {
 
   assert(utils.isNumber(this.version));
   assert(utils.isNumber(this.height));
-  assert(typeof this.value === 'number');
+  assert(utils.isNumber(this.value));
   assert(this.script instanceof bcoin.script);
   assert(typeof this.coinbase === 'boolean');
   assert(!this.hash || typeof this.hash === 'string');
-  assert(!this.index || typeof this.index === 'number');
+  assert(!this.index || utils.isNumber(this.index));
 
   return this;
 };
diff --git a/lib/bcoin/keyring.js b/lib/bcoin/keyring.js
index 7fb15e1b..e7bee97a 100644
--- a/lib/bcoin/keyring.js
+++ b/lib/bcoin/keyring.js
@@ -317,7 +317,7 @@ KeyRing.prototype.getKeyAddress = function getKeyAddress() {
  */
 
 KeyRing.prototype.compile = function compile(hash, type, version) {
-  return bcoin.address.toBase58(hash, type, version, this.network);
+  return bcoin.address.fromHash(hash, type, version, this.network).toBase58();
 };
 
 /**