diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index 620186b1..ee7ddbc6 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -216,63 +216,79 @@ Block.prototype.getMerkleRoot = function getMerkleRoot() {
   return merkleTree[merkleTree.length - 1];
 };
 
-// This mimics the behavior of CheckBlockHeader()
-// and CheckBlock() in bitcoin/src/main.cpp.
 Block.prototype._verify = function _verify() {
   var uniq = {};
   var i, tx, hash;
 
-  // Check proof of work matches claimed amount
-  if (!utils.testTarget(this.bits, this.hash()))
+  // Check proof of work
+  if (!utils.testTarget(this.bits, this.hash())) {
+    this.chain.emit('debug', 'Block failed POW test: %s', this.rhash);
     return false;
-
-  // Check timestamp
-  if (this.ts > utils.now() + 2 * 60 * 60)
-    return false;
-
-  if (this.subtype === 'merkleblock') {
-    if (!this._verifyPartial())
-      return false;
   }
 
+  // Check timestamp against now + 2 hours
+  if (this.ts > utils.now() + 2 * 60 * 60) {
+    this.chain.emit('debug', 'Block timestamp is too high: %s', this.rhash);
+    return false;
+  }
+
+  // Verify the partial merkle tree if we are a merkleblock.
+  if (this.subtype === 'merkleblock') {
+    if (!this._verifyPartial()) {
+      this.chain.emit('debug', 'Block failed merkle test: %s', this.rhash);
+      return false;
+    }
+  }
+
+  // Merkleblock and headers cannot do anymore tests.
   if (this.subtype !== 'block')
     return true;
 
   // Size can't be bigger than MAX_BLOCK_SIZE
   if (this.txs.length > constants.block.maxSize
       || this.size() > constants.block.maxSize) {
+    this.chain.emit('debug', 'Block is too large: %s', this.rhash);
     return false;
   }
 
   // First TX must be a coinbase
-  if (!this.txs.length || !this.txs[0].isCoinbase())
+  if (!this.txs.length || !this.txs[0].isCoinbase()) {
+    this.chain.emit('debug', 'Block has no coinbase: %s', this.rhash);
     return false;
+  }
 
   // Test all txs
   for (i = 0; i < this.txs.length; i++) {
     tx = this.txs[i];
 
     // The rest of the txs must not be coinbases
-    if (i > 0 && tx.isCoinbase())
+    if (i > 0 && tx.isCoinbase()) {
+      this.chain.emit('debug', 'Block more than one coinbase: %s', this.rhash);
       return false;
+    }
 
     // Check for duplicate txids
     hash = tx.hash('hex');
-    if (uniq[hash])
+    if (uniq[hash]) {
+      this.chain.emit('debug', 'Block has duplicate txids: %s', this.rhash);
       return false;
+    }
     uniq[hash] = true;
   }
 
   // Check merkle root
-  if (this.getMerkleRoot() !== this.merkleRoot)
+  if (this.getMerkleRoot() !== this.merkleRoot) {
+    this.chain.emit('debug', 'Block failed merkleroot test: %s', this.rhash);
     return false;
+  }
 
   return true;
 };
 
 Block.prototype.postVerify = function postVerify() {
   var flags = {};
-  var prev, height, i, j, tx, cb, sigops, input;
+  var sigops = 0;
+  var prev, height, ts, i, j, tx, cb, input;
 
   if (this.subtype !== 'block')
     return true;
@@ -284,96 +300,121 @@ Block.prototype.postVerify = function postVerify() {
     return true;
 
   prev = this.chain.getBlock(this.prevBlock);
-  height = prev.height + 1;
 
   // Ensure it's not an orphan
   if (!prev) {
-    console.log('NO PREV: %s', height);
+    this.chain.emit('debug', 'Block has no previous entry: %s', this.rhash);
     return false;
   }
 
+  height = prev.height + 1;
+
   // Ensure the timestamp is correct
   if (this.ts <= prev.getMedianTime()) {
-    console.log('BAD TIME: %s', height);
+    this.chain.emit('debug', 'Block time is lower than median: %s', this.rhash);
     return false;
   }
 
-  // Test all txs
-  for (i = 0; i < this.txs.length; i++) {
-    tx = this.txs[i];
-
-    // TXs must be finalized with regards to seq and locktime
-    if (!tx.isFinal(this, prev)) {
-      console.log('IS NOT FINAL: %s', height);
-      return false;
-    }
-  }
-
   // Ensure the miner's target is equal to what we expect
   if (this.bits !== this.chain.target(prev, this)) {
-    console.log('BAD TARGET: %s', height);
+    this.chain.emit('debug', 'Block is using wrong target: %s', this.rhash);
     return false;
   }
 
   // Only allow version 2 blocks (coinbase height)
   // once the majority of blocks are using it.
   if (this.version < 2 && prev.isOutdated(2)) {
-    console.log('OUTDATED 2: %s', height);
+    this.chain.emit('debug', 'Block is outdated (v2): %s', this.rhash);
     return false;
   }
 
   // Only allow version 3 blocks (sig validation)
   // once the majority of blocks are using it.
   if (this.version < 3 && prev.isOutdated(3)) {
-    console.log('OUTDATED 3: %s', height);
+    this.chain.emit('debug', 'Block is outdated (v3): %s', this.rhash);
     return false;
   }
 
   // Only allow version 4 blocks (checklocktimeverify)
   // once the majority of blocks are using it.
   if (this.version < 4 && prev.isOutdated(4)) {
-    console.log('OUTDATED 4: %s', height);
+    this.chain.emit('debug', 'Block is outdated (v4): %s', this.rhash);
     return false;
   }
 
-  // Make sure the height contained in the
-  // coinbase is correct.
+  // Only allow version 8 blocks (locktime median past)
+  // once the majority of blocks are using it.
+  // if (this.version < 8 && prev.isOutdated(8)) {
+  //   this.chain.emit('debug', 'Block is outdated (v8): %s', this.rhash);
+  //   return false;
+  // }
+
+  // Make sure the height contained in the coinbase is correct.
   if (this.version >= 2 && prev.isUpgraded(2)) {
     cb = bcoin.script.isCoinbase(this.txs[0].inputs[0].script, this);
 
+    // Make sure the coinbase is parseable.
     if (!cb) {
-      console.log('BAD COINBASE: %s', height);
+      this.chain.emit('debug', 'Block has malformed coinbase: %s', this.rhash);
       return false;
     }
 
+    // Make sure coinbase height is equal to the actual height.
     if (cb.height !== height) {
-      console.log('BAD COINBASE HEIGHT: %s', height);
+      this.chain.emit('debug', 'Block has bad coinbase height: %s', this.rhash);
       return false;
     }
   }
 
   // Signature validation is now enforced (bip66)
-  if (this.version >= 3 && prev.isUpgraded(3))
-    flags.strictder = true;
+  if (!(this.version >= 3 && prev.isUpgraded(3)))
+    flags.strictder = false;
 
   // CHECKLOCKTIMEVERIFY is now usable (bip65)
-  if (this.version >= 4 && prev.isUpgraded(4))
-    flags.cltv = true;
+  if (!(this.version >= 4 && prev.isUpgraded(4)))
+    flags.cltv = false;
 
-  // Check for sigops limits
-  sigops = 0;
+  // Use nLockTime median past (bip113)
+  // https://github.com/btcdrak/bips/blob/d4c9a236ecb947866c61aefb868b284498489c2b/bip-0113.mediawiki
+  // Support version bits:
+  // https://gist.github.com/sipa/bf69659f43e763540550
+  // http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010396.html
+  // if (this.version >= 8 && prev.isUpgraded(8))
+  //   flags.locktimeMedian = true;
+
+  // If we are an ancestor of a checkpoint, we can
+  // skip the input verification.
+  if (height < network.checkpoints.lastHeight && !network.checkpoints[height])
+    flags.scriptChecks = false;
+
+  // Get timestamp for tx.isFinal().
+  ts = flags.locktimeMedian
+    ? prev.getMedianTime()
+    : this.ts;
+
+  // Check all transactions
   for (i = 0; i < this.txs.length; i++) {
     tx = this.txs[i];
 
+    // Transactions must be finalized with
+    // regards to nSequence and nLockTime.
+    if (!tx.isFinal(height, ts)) {
+      this.chain.emit('debug', 'TX is not final: %s (%s)', this.rhash, i);
+      return false;
+    }
+
+    // Check for tx sigops limits
     // Bitcoind does not check for this when accepting
     // a block even though it probably should.
     // if (tx.sigops(true) > constants.script.maxTxSigops) {
     //   // Block 71036 abused checksig to
     //   // include a huge number of sigops.
+    //   this.chain.emit('debug', 'Block TX has too many sigops: %s', this.rhash);
     //   if (!(network.type === 'main' && height === 71036))
     //     return false;
     // }
 
+    // Check for block sigops limits
     // Start counting P2SH sigops once block
     // timestamps reach March 31st, 2012.
     if (this.ts >= constants.block.bip16time)
@@ -382,50 +423,46 @@ Block.prototype.postVerify = function postVerify() {
       sigops += tx.sigops();
 
     if (sigops > constants.script.maxBlockSigops) {
-      console.log('BAD SIGOPS: %s', height);
+      this.chain.emit('debug', 'Block has too many sigops: %s', this.rhash);
       return false;
     }
-  }
 
-  // BIP30 - Ensure there are no duplicate txids
-  for (i = 0; i < this.txs.length; i++) {
-    tx = this.txs[i];
+    // BIP30 - Ensure there are no duplicate txids
     if (this.chain.index[tx.hash('hex')]) {
       // Blocks 91842 and 91880 created duplicate
       // txids by carefully crafting the coinbases.
-      if (!(network.type === 'main' && height === 91842 && height === 91880))
+      this.chain.emit('debug', 'Block is overwriting txids: %s', this.rhash);
+      if (!(network.type === 'main' && (height === 91842 || height === 91880)))
         return false;
     }
-  }
 
-  // If we are an ancestor of a checkpoint,
-  // we can skip the input verification.
-  if (height < network.checkpoints.lastHeight && !network.checkpoints[height])
-    flags.noScriptChecks = true;
-
-  // Verify the inputs of every tx (CheckInputs)
-  for (i = 0; i < this.txs.length; i++) {
-    tx = this.txs[i];
-
-    if (tx.isCoinbase())
-      continue;
-
-    if (flags.noScriptChecks)
-      continue;
-
-    for (j = 0; j < tx.inputs.length; j++) {
-      input = tx.inputs[j];
-
-      if (!input.out.tx)
+    // Verify the inputs of every tx (CheckInputs)
+    if (flags.scriptChecks !== false) {
+      if (tx.isCoinbase())
         continue;
 
-      assert(input.out.tx);
+      for (j = 0; j < tx.inputs.length; j++) {
+        input = tx.inputs[j];
 
-      if (!tx.verify(j, true, flags))
-        return false;
+        // We need the previous output in order
+        // to verify the script.
+        if (!input.out.tx)
+          continue;
 
-      // if (this.chain.isSpent(input.out.hash, input.out.index))
-      //   return false;
+        assert(input.out.tx);
+
+        // Verify the script
+        if (!tx.verify(j, true, flags)) {
+          this.chain.emit('debug', 'Block has invalid inputs: %s', this.rhash);
+          return false;
+        }
+
+        // Ensure tx is not double spending an output
+        // if (this.chain.isSpent(input.out.hash, input.out.index)) {
+        //   this.chain.emit('debug', 'Block is using spent inputs: %s', this.rhash);
+        //   return false;
+        // }
+      }
     }
   }
 
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 5cf1a77c..623c811a 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -50,6 +50,12 @@ function Chain(options) {
 
   this.request = new utils.RequestCache();
 
+  this.fromJSON(require('./protocol/preload-full'));
+  this.storage = null;
+  //this.resetHeight(133000);
+  this.resetHeight(145000);
+
+  if (0)
   this.fromJSON({
     v: 2,
     type: 'chain',
@@ -608,7 +614,10 @@ Chain.prototype.height = function height() {
   return this.getTip().height;
 };
 
-// /home/chjj/bitcoin/src/pow.cpp
+Chain.prototype.currentTarget = function currentTarget() {
+  return this.target(this.getTip());
+};
+
 Chain.prototype.target = function target(last, block) {
   var powLimit = utils.toCompact(network.powLimit);
   var ts, first, i;
diff --git a/lib/bcoin/miner.js b/lib/bcoin/miner.js
index 943559e5..0d1f8036 100644
--- a/lib/bcoin/miner.js
+++ b/lib/bcoin/miner.js
@@ -139,7 +139,9 @@ Miner.prototype.addBlock = function addBlock(block) {
 };
 
 Miner.prototype.addTX = function addTX(tx) {
-  var full = this.index.inputs.every(function(input) {
+  var full, ts;
+
+  full = this.index.inputs.every(function(input) {
     return !!input.out.tx;
   });
 
@@ -160,7 +162,12 @@ Miner.prototype.addTX = function addTX(tx) {
   if (tx.isCoinbase())
     return;
 
-  if (!tx.isFinal(this.block, this.last))
+  // Get timestamp for tx.isFinal() - bip113
+  ts = this.block.version === 8
+    ? this.last.getMedianTime()
+    : this.block.ts;
+
+  if (!tx.isFinal(this.last.height + 1, ts))
     return;
 
   // Deliver me from the block size debate, please
diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index a5fc2133..818e8172 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -548,6 +548,10 @@ Peer.prototype.loadHeaders = function loadHeaders(hashes, stop) {
   this.emit('debug',
     'Requesting headers packet from %s with getheaders',
     this.host);
+  this.pool.emit('debug', 'Height: %s, Hash: %s, Stop: %s',
+    this.pool.chain.getHeight(hashes[0]),
+    hashes ? utils.revHex(hashes[0]) : 0,
+    stop ? utils.revHex(stop) : 0);
   this._write(this.framer.getHeaders(hashes, stop));
 };
 
@@ -555,6 +559,10 @@ Peer.prototype.loadBlocks = function loadBlocks(hashes, stop) {
   this.emit('debug',
     'Requesting inv packet from %s with getblocks',
     this.host);
+  this.pool.emit('debug', 'Height: %s, Hash: %s, Stop: %s',
+    this.pool.chain.getHeight(hashes[0]),
+    hashes ? utils.revHex(hashes[0]) : 0,
+    stop ? utils.revHex(stop) : 0);
   this._write(this.framer.getBlocks(hashes, stop));
 };
 
@@ -571,6 +579,13 @@ Peer.prototype.loadMempool = function loadMempool() {
   this._write(this.framer.mempool());
 };
 
+Peer.prototype.reject = function reject(details) {
+  this.emit('debug',
+    'Sending reject packet to %s',
+    this.host);
+  this._write(this.framer.reject(details));
+};
+
 /**
  * Expose
  */
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 84aa8837..4e3bad5f 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -42,7 +42,7 @@ function Pool(options) {
   this.destroyed = false;
   this.size = options.size || 32;
   this.parallel = options.parallel || 2000;
-  this.redundancy = options.redundancy || 2;
+  this.redundancy = options.redundancy || 1;
   this.seeds = options.seeds
     ? options.seeds.slice()
     : network.seeds.slice();
@@ -320,10 +320,14 @@ Pool.prototype._addLoader = function _addLoader() {
   });
 
   peer.on('merkleblock', function(block) {
+    self._startInterval();
+    self._startTimer();
     self._handleBlock(block, peer);
   });
 
   peer.on('block', function(block) {
+    self._startInterval();
+    self._startTimer();
     self._handleBlock(block, peer);
   });
 
@@ -346,7 +350,6 @@ Pool.prototype._addLoader = function _addLoader() {
 };
 
 Pool.prototype._handleHeaders = function _handleHeaders(headers, peer) {
-  var reqs = 0;
   var i, header, last, block;
 
   assert(this.options.headers);
@@ -375,10 +378,8 @@ Pool.prototype._handleHeaders = function _handleHeaders(headers, peer) {
     if (!block.verify())
       break;
 
-    if (!this.chain.has(block)) {
+    if (!this.chain.has(block))
       this._request(this.block.type, block.hash('hex'));
-      reqs++;
-    }
 
     last = block;
   }
@@ -401,15 +402,9 @@ Pool.prototype._handleHeaders = function _handleHeaders(headers, peer) {
 
   // Reset timeout to avoid killing the loader
   this._startTimer();
-
-  this.emit('debug',
-    'Requesting %s block packets from %s with getdata',
-    reqs, peer.host
-  );
 };
 
 Pool.prototype._handleBlocks = function _handleBlocks(hashes, peer) {
-  var reqs = 0;
   var i, hash;
 
   assert(!this.options.headers);
@@ -435,7 +430,6 @@ Pool.prototype._handleBlocks = function _handleBlocks(hashes, peer) {
     // Request block if we don't have it
     if (!this.chain.has(hash)) {
       this._request(this.block.type, hash);
-      reqs++;
       continue;
     }
 
@@ -457,11 +451,6 @@ Pool.prototype._handleBlocks = function _handleBlocks(hashes, peer) {
 
   // Reset timeout to avoid killing the loader
   this._startTimer();
-
-  this.emit('debug',
-    'Requesting %s block packets from %s with getdata',
-    reqs, peer.host
-  );
 };
 
 Pool.prototype._handleInv = function _handleInv(hashes, peer) {
@@ -490,10 +479,6 @@ Pool.prototype._handleBlock = function _handleBlock(block, peer) {
 
   var requested = this._response(block);
 
-  // Someone is sending us blocks without us requesting them.
-  if (!requested)
-    return;
-
   // Emulate bip37 - emit all the "watched" txs
   if (this.options.fullNode && this.listeners('watched').length > 0) {
     block.txs.forEach(function(tx) {
@@ -503,15 +488,21 @@ Pool.prototype._handleBlock = function _handleBlock(block, peer) {
   }
 
   // Ignore if we already have
-  if (this.chain.has(block))
+  if (this.chain.has(block)) {
+    this.emit('debug', 'Already have block %s (%s)', block.height, peer.host);
     return;
+  }
 
   // Make sure the block is valid
   if (!block.verify()) {
-    this.emit('debug', 'Block verification failed for %s', block.hash('hex'));
+    this.emit('debug', 'Block verification failed for %s (%s)', block.rhash, peer.host);
     return;
   }
 
+  // Someone is sending us blocks without us requesting them.
+  if (!requested)
+    this.emit('debug', 'Recieved unrequested block: %s (%s)', block.rhash, peer.host);
+
   // Resolve orphan chain
   if (!this.options.headers) {
     if (!this.chain.hasBlock(block.prevBlock)) {
@@ -521,10 +512,11 @@ Pool.prototype._handleBlock = function _handleBlock(block, peer) {
       // the height until later.
       if (this._addIndex(block, peer))
         this.emit('pool block', block, peer);
-      peer.loadBlocks(
+      this.peers.load.loadBlocks(
         this.chain.locatorHashes(),
         this.chain.getOrphanRoot(block)
       );
+      this.emit('debug', 'Handled orphan %s (%s)', block.rhash, peer.host);
       return;
     }
   }
@@ -786,11 +778,6 @@ Pool.prototype._removePeer = function _removePeer(peer) {
   if (this.peers.load === peer) {
     this.emit('debug', 'Removed loader peer (%s).', peer.host);
     this.peers.load = null;
-    // i = this.seeds.indexOf(peer.host);
-    // if (i === -1)
-    //   i = this.seeds.indexOf(peer.host + ':' + peer.port);
-    // if (i !== -1)
-    //   this.seeds.splice(i, 1);
   }
 };
 
@@ -1236,6 +1223,9 @@ Pool.prototype._doRequests = function _doRequests() {
   if (above && below && this.load.hiReached)
     this._load();
 
+  if (items.length === 0)
+    return;
+
   if (this.options.multiplePeers) {
     mapReq = function(item) {
       return item.start(this.peers.block[i]);
@@ -1258,6 +1248,12 @@ Pool.prototype._doRequests = function _doRequests() {
     return item.start(this.peers.load);
   }, this);
 
+  this.emit('debug',
+    'Requesting %s/%s items from %s with getdata',
+    req.length,
+    this.request.queue.length,
+    this.peers.load.host);
+
   this.peers.load.getData(req);
 };
 
@@ -1506,16 +1502,17 @@ LoadRequest.prototype.start = function start(peer) {
   var reqType;
 
   assert(!this.active);
+  assert(!this.timer);
+  assert(!this.peer);
+
   this.active = true;
   this.pool.request.active++;
 
-  assert(!this.timer);
-  this.timer = setTimeout(function() {
-    self.timer = null;
-    self.retry();
-  }, this.pool.requestTimeout);
+  // this.timer = setTimeout(function() {
+  //   self.timer = null;
+  //   self.retry();
+  // }, this.pool.requestTimeout);
 
-  assert(!this.peer);
   this.peer = peer;
   this.peer.once('close', this.onclose);
 
diff --git a/lib/bcoin/protocol/constants.js b/lib/bcoin/protocol/constants.js
index 0ad589a7..2afebb3d 100644
--- a/lib/bcoin/protocol/constants.js
+++ b/lib/bcoin/protocol/constants.js
@@ -5,6 +5,7 @@
  */
 
 var bcoin = require('../../bcoin');
+var bn = require('bn.js');
 var utils = bcoin.utils;
 
 var i;
@@ -219,3 +220,7 @@ exports.zeroHash = utils.toArray(
 
 exports.userVersion = require('../../../package.json').version;
 exports.userAgent = '/bcoin:' + exports.userVersion + '/';
+
+exports.coin = new bn(10000000).muln(10);
+exports.cent = new bn(1000000);
+exports.maxMoney = new bn(21000000).mul(exports.coin);
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index dfb49abf..fa7faed9 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -357,6 +357,32 @@ Framer.prototype.merkleBlock = function merkleBlock(block) {
   return this.packet('merkleblock', Framer.block(block, 'merkleblock'));
 };
 
+Framer.prototype.reject = function reject(details) {
+  var p = [];
+  var off = 0;
+
+  var message = details.message || '';
+  var ccode = constants.reject[details.ccode] || constants.reject.malformed;
+  var reason = details.reason || '';
+  var data = details.data || [];
+
+  off += utils.writeIntv(p, message.length, off);
+  utils.writeAscii(p, message, off);
+  off += message.length;
+
+  p[off] = ccode;
+  off++;
+
+  off += utils.writeIntv(p, reason.length, off);
+  utils.writeAscii(p, reason, off);
+  off += reason.length;
+
+  utils.copy(data, p, off, true);
+  off += data.length;
+
+  return this.packet('reject', p);
+};
+
 Framer.prototype.addr = function addr(peers) {
   var p = [];
   var off = 0;
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 868cb0da..25a61d55 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -295,12 +295,12 @@ Parser.prototype.parseBlock = function parseBlock(p) {
   off = result.off;
   totalTX = result.r;
 
-  if (p.length >= off + 10) {
-    for (i = 0; i < totalTX; i++) {
-      tx = this.parseTX(p.slice(off));
-      off += tx._off;
-      txs.push(tx);
-    }
+  for (i = 0; i < totalTX; i++) {
+    tx = this.parseTX(p.slice(off));
+    if (!tx)
+      return this._error('Invalid tx count for block');
+    off += tx._off;
+    txs.push(tx);
   }
 
   return {
diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 59b24225..0bcfa6e3 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -686,8 +686,13 @@ script.execute = function execute(s, stack, tx, index, flags, recurse) {
         if (!constants.hashTypeByVal[type & 0x1f])
           return false;
 
-        if (!script.isValidSig(sig))
-          return false;
+        if (flags.strictder !== false) {
+          if (!script.isValidSig(sig))
+            return false;
+        } else {
+          if (!script.isSig(sig))
+            return false;
+        }
 
         subscript = script.subscript(s, lastSep);
         hash = tx.subscriptHash(index, subscript, type);
@@ -743,8 +748,13 @@ script.execute = function execute(s, stack, tx, index, flags, recurse) {
           if (!constants.hashTypeByVal[type & 0x1f])
             return false;
 
-          if (!script.isValidSig(sig))
-            return false;
+          if (flags.strictder !== false) {
+            if (!script.isValidSig(sig))
+              return false;
+          } else {
+            if (!script.isSig(sig))
+              return false;
+          }
 
           hash = tx.subscriptHash(index, subscript, type);
 
@@ -775,6 +785,9 @@ script.execute = function execute(s, stack, tx, index, flags, recurse) {
       }
       case 'checklocktimeverify': {
         // OP_CHECKLOCKTIMEVERIFY = OP_NOP2
+        if (flags.cltv === false)
+          break;
+
         if (!tx || stack.length === 0)
           return false;
 
@@ -1298,6 +1311,16 @@ script.isCoinbase = function isCoinbase(s, block) {
   return coinbase;
 };
 
+script.isSig = function isSig(sig, allowZero) {
+  if (!Array.isArray(sig))
+    return false;
+
+  if (allowZero && sig.length === 0)
+    return true;
+
+  return 9 <= sig.length && sig.length <= 73;
+};
+
 // https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki
 /**
  * A canonical signature exists of: <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index ebc52b45..53ed14f7 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -838,29 +838,29 @@ TX.prototype.funds = function funds(side) {
 // Used for postVerify/ContextualBlockCheck and miner isFinalTx call.
 // BIP113 will require that time-locked transactions have nLockTime set to
 // less than the median time of the previous block they're contained in.
-TX.prototype.isFinal = function isFinal(block, prev) {
+TX.prototype.isFinalBlock = function isFinalBlock(block, prev, useMedian) {
   var height = prev.height + 1;
-  var ts = this.locktimeMedian ? prev.getMedianTime() : block.ts;
-  return this._isFinal(height, ts);
+  var ts = useMedian ? prev.getMedianTime() : block.ts;
+  return this.isFinal(height, ts);
 };
 
 // Used in AcceptToMemoryPool
-TX.prototype.isFinalAccept = function isFinalAccept() {
+TX.prototype.isFinalMempool = function isFinalMempool(useMedian) {
   var height = this.chain.height() + 1;
-  var ts = this.lockTimeMedian
+  var ts = useMedian
     ? this.chain.getTip().getMedianTime()
     : utils.now();
-  return this._isFinalTx(height, ts);
+  return this.isFinal(height, ts);
 };
 
 // Used in the original bitcoind code for AcceptBlock
-TX.prototype._isFinalOriginal = function _isFinalOriginal(block) {
+TX.prototype.isFinalLegacy = function isFinalLegacy(block) {
   var ts = block ? block.ts : utils.now();
   var height = this.chain.height();
-  return this._isFinalTx(height, ts);
+  return this.isFinal(height, ts);
 };
 
-TX.prototype._isFinal = function _isFinal(height, ts) {
+TX.prototype.isFinal = function isFinal(height, ts) {
   var threshold = constants.locktimeThreshold;
   var i;
 
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 497972a9..2f8da9df 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -81,7 +81,7 @@ function Wallet(options, passphrase) {
   this.m = 1;
   this.n = 1;
 
-  this.prefix = 'bt/' + this.getOwnAddress() + '/';
+  this.prefix = 'bt/wallet/' + this.getOwnAddress() + '/';
 
   this.multisig(options.multisig || {});