Add bitcoin network type for simulation testing.

protocol.go

@@ -94,6 +94,9 @@ const (
 
 	// TestNet3 represents the test network (version 3).
 	TestNet3 BitcoinNet = 0x0709110b
+
+	// SimNet represents the simulation test network.
+	SimNet BitcoinNet = 0x12141c16
 )
 
 // bnStrings is a map of bitcoin networks back to their constant names for
@@ -102,6 +105,7 @@ var bnStrings = map[BitcoinNet]string{
 	MainNet:  "MainNet",
 	TestNet:  "TestNet",
 	TestNet3: "TestNet3",
+	SimNet:   "SimNet",
 }
 
 // String returns the BitcoinNet in human-readable form.

protocol_test.go

@@ -40,6 +40,7 @@ func TestBitcoinNetStringer(t *testing.T) {
 		{btcwire.MainNet, "MainNet"},
 		{btcwire.TestNet, "TestNet"},
 		{btcwire.TestNet3, "TestNet3"},
+		{btcwire.SimNet, "SimNet"},
 		{0xffffffff, "Unknown BitcoinNet (4294967295)"},
 	}