diff --git a/lib/bcoin/compactblock.js b/lib/bcoin/compactblock.js
index 2ef4e53f..73094a44 100644
--- a/lib/bcoin/compactblock.js
+++ b/lib/bcoin/compactblock.js
@@ -54,7 +54,6 @@ function CompactBlock(data) {
 
   bcoin.abstractblock.call(this, data);
 
-  this.type = 'compactblock';
   this.coinbaseHeight = -1;
 
   if (this.version >= 2) {
@@ -94,13 +93,10 @@ CompactBlock.prototype.getCoinbaseHeight = function getCoinbaseHeight() {
  */
 
 CompactBlock.prototype.toBlock = function toBlock() {
-  var block = bcoin.protocol.parser.parseBlock(this._raw);
+  var data = bcoin.protocol.parser.parseBlock(this._raw);
   delete this._raw;
-  assert(!block._raw);
-  block = new bcoin.block(block);
-  if (this.valid != null)
-    block.valid = this.valid;
-  return block;
+  assert(!data._raw);
+  return new bcoin.block(data);
 };
 
 /**
@@ -109,10 +105,8 @@ CompactBlock.prototype.toBlock = function toBlock() {
  * @returns {Boolean}
  */
 
-CompactBlock.isCompactBlock = function isCompactBlock(block) {
-  return block
-    && block.type === 'compactblock'
-    && typeof block.toBlock === 'function';
+CompactBlock.isCompactBlock = function isCompactBlock(obj) {
+  return obj && typeof obj.toBlock === 'function';
 };
 
 return CompactBlock;
diff --git a/lib/bcoin/headers.js b/lib/bcoin/headers.js
index 7e736aca..8dafc0ef 100644
--- a/lib/bcoin/headers.js
+++ b/lib/bcoin/headers.js
@@ -34,8 +34,6 @@ function Headers(data) {
     return new Headers(data);
 
   bcoin.abstractblock.call(this, data);
-
-  this.type = 'headers';
 }
 
 utils.inherits(Headers, bcoin.abstractblock);
@@ -151,7 +149,10 @@ Headers.fromRaw = function fromRaw(data, enc) {
  */
 
 Headers.isHeaders = function isHeaders(obj) {
-  return obj && obj.type === 'headers' && typeof obj.render === 'function';
+  return obj
+    && !obj.txs
+    && typeof obj.abbr === 'function'
+    && typeof obj.toBlock !== 'function';
 };
 
 /**
diff --git a/lib/bcoin/merkleblock.js b/lib/bcoin/merkleblock.js
index e0e1c615..4cdd7c2c 100644
--- a/lib/bcoin/merkleblock.js
+++ b/lib/bcoin/merkleblock.js
@@ -41,8 +41,6 @@ function MerkleBlock(data) {
 
   bcoin.abstractblock.call(this, data);
 
-  this.type = 'merkleblock';
-
   this.hashes = (data.hashes || []).map(function(hash) {
     return utils.toBuffer(hash, 'hex');
   });
@@ -284,18 +282,6 @@ MerkleBlock.fromRaw = function fromRaw(data, enc) {
   return new MerkleBlock(MerkleBlock._fromRaw(data, enc));
 };
 
-/**
- * Test an object to see if it is a MerkleBlock object.
- * @param {Object} obj
- * @returns {Boolean}
- */
-
-MerkleBlock.isMerkleBlock = function isMerkleBlock(obj) {
-  return obj
-    && Array.isArray(obj.flags)
-    && typeof obj._verifyPartial === 'function';
-};
-
 /**
  * Create a merkleblock from a {@link Block} object, passing
  * it through a filter first. This will build the partial
@@ -394,5 +380,17 @@ MerkleBlock.fromBlock = function fromBlock(block, bloom) {
   return block;
 };
 
+/**
+ * Test an object to see if it is a MerkleBlock object.
+ * @param {Object} obj
+ * @returns {Boolean}
+ */
+
+MerkleBlock.isMerkleBlock = function isMerkleBlock(obj) {
+  return obj
+    && Array.isArray(obj.flags)
+    && typeof obj._verifyPartial === 'function';
+};
+
 return MerkleBlock;
 };