diff --git a/const.go b/const.go
new file mode 100644
index 0000000..08f20ff
--- /dev/null
+++ b/const.go
@@ -0,0 +1,16 @@
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package btcutil
+
+const (
+	// SatoshiPerBitcent is the number of satoshi in one bitcoin cent.
+	SatoshiPerBitcent int64 = 1e6
+
+	// SatoshiPerBitcoin is the number of satoshi in one bitcoin (1 BTC).
+	SatoshiPerBitcoin int64 = 1e8
+
+	// MaxSatoshi is the maximum transaction amount allowed in satoshi.
+	MaxSatoshi int64 = 21e6 * SatoshiPerBitcoin
+)