tapscript+tapgarden: move dummy script to tapscript

Author: Roasbeef

tapgarden/caretaker.go

@@ -1,7 +1,6 @@
 package tapgarden
 
 import (
-	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -22,6 +21,7 @@ import (
 	"github.com/lightninglabs/taproot-assets/commitment"
 	"github.com/lightninglabs/taproot-assets/fn"
 	"github.com/lightninglabs/taproot-assets/proof"
+	"github.com/lightninglabs/taproot-assets/tapscript"
 	"github.com/lightninglabs/taproot-assets/universe"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
@@ -30,17 +30,11 @@ import (
 )
 
 var (
-	// GenesisDummyScript is a dummy script that we'll use to fund the
-	// initial PSBT packet that'll create initial set of assets. It's the
-	// same size as a encoded P2TR output and has a valid P2TR prefix.
-	GenesisDummyScript = append(
-		[]byte{0x51, 0x20}, bytes.Repeat([]byte{0x00}, 32)...,
-	)
 
 	// DummyGenesisTxOut is the dummy TxOut we'll place in the PSBt funding
 	// request to make sure we leave enough room for change and fees.
 	DummyGenesisTxOut = wire.TxOut{
-		PkScript: GenesisDummyScript[:],
+		PkScript: tapscript.GenesisDummyScript[:],
 		Value:    int64(GenesisAmtSats),
 	}
 

tapgarden/planter_test.go

@@ -365,7 +365,7 @@ func (t *mintingTestHarness) assertGenesisTxFunded() *tapgarden.FundedPsbt {
 		if txOut.Value == int64(tapgarden.GenesisAmtSats) {
 			isP2TR := txscript.IsPayToTaproot(txOut.PkScript)
 			isDummyScript := bytes.Equal(
-				txOut.PkScript, tapgarden.GenesisDummyScript[:],
+				txOut.PkScript, tapscript.GenesisDummyScript[:],
 			)
 
 			if isP2TR || isDummyScript {

tapscript/send.go

@@ -16,6 +16,7 @@ import (
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/btcutil/psbt"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
+	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btclog"
 	"github.com/lightninglabs/taproot-assets/address"
@@ -105,16 +106,23 @@ var (
 	)
 )
 
+var (
+	// GenesisDummyScript is a dummy script that we'll use to fund the
+	// initial PSBT packet that'll create initial set of assets. It's the
+	// same size as a encoded P2TR output and has a valid P2TR prefix.
+	GenesisDummyScript = append(
+		[]byte{txscript.OP_1, 0x20}, bytes.Repeat([]byte{0x00}, 32)...,
+	)
+)
+
 // createDummyOutput creates a new Bitcoin transaction output that is later
 // used to embed a Taproot Asset commitment.
 func createDummyOutput() *wire.TxOut {
 	// The dummy PkScript is the same size as an encoded P2TR output and has
 	// a valid P2TR prefix.
 	newOutput := wire.TxOut{
-		Value: int64(DummyAmtSats),
-		PkScript: append(
-			[]byte{0x51, 0x20}, bytes.Repeat([]byte{0x00}, 32)...,
-		),
+		Value:    int64(DummyAmtSats),
+		PkScript: GenesisDummyScript,
 	}
 	return &newOutput
 }