module: run go mod tidy && go mod vendor

vendor/github.com/btcsuite/btcutil/const.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2013-2014 The btcsuite developers
+// 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 = 1e6
+
+	// SatoshiPerBitcoin is the number of satoshi in one bitcoin (1 BTC).
+	SatoshiPerBitcoin = 1e8
+
+	// MaxSatoshi is the maximum transaction amount allowed in satoshi.
+	MaxSatoshi = 21e6 * SatoshiPerBitcoin
+)