orphan fork and notfound.

lib/bcoin/chain.js

@@ -1376,16 +1376,12 @@ Chain.prototype.add = function add(block, callback, force) {
       // If the orphan chain forked, simply
       // reset the orphans.
       if (orphan.hash('hex') !== hash) {
-        self.purgeOrphans();
-
         self.emit('fork', block, {
           height: block.getCoinbaseHeight(),
           expected: orphan.hash('hex'),
           received: hash,
           checkpoint: false
         });
-
-        return done(new VerifyError(block, 'duplicate', 'duplicate', 0));
       }
 
       self.emit('orphan', block, {

lib/bcoin/peer.js

@@ -611,6 +611,9 @@ Peer.prototype._onPacket = function onPacket(packet) {
     case 'verack':
       this._emit(cmd, payload);
       break;
+    case 'notfound':
+      this._emit(cmd, payload);
+      break;
     default:
       bcoin.debug('Unknown packet: %s', cmd);
       this._emit(cmd, payload);