contractcourt: split commit blob into settled vs breached

For the breach case, we'll have more than one output to sweep. So we'll
need more than one blob to use.

Author: Roasbeef

contractcourt/briefcase.go

@@ -1558,7 +1558,7 @@ func encodeTaprootAuxData(w io.Writer, c *ContractResolutions) error {
 		tapCase.CtrlBlocks.Val.CommitSweepCtrlBlock = commitSignDesc.ControlBlock
 
 		c.CommitResolution.ResolutionBlob.WhenSome(func(b []byte) {
-			tapCase.CommitBlob = tlv.SomeRecordT(
+			tapCase.SettledCommitBlob = tlv.SomeRecordT(
 				tlv.NewPrimitiveRecord[tlv.TlvType2](b),
 			)
 		})
@@ -1649,7 +1649,7 @@ func decodeTapRootAuxData(r io.Reader, c *ContractResolutions) error {
 		c.CommitResolution.SelfOutputSignDesc.ControlBlock =
 			tapCase.CtrlBlocks.Val.CommitSweepCtrlBlock
 
-		tapCase.CommitBlob.WhenSomeV(func(b []byte) {
+		tapCase.SettledCommitBlob.WhenSomeV(func(b []byte) {
 			c.CommitResolution.ResolutionBlob = fn.Some(b)
 		})
 	}

contractcourt/taproot_briefcase.go

@@ -30,10 +30,16 @@ type taprootBriefcase struct {
 	// revocation paths.
 	TapTweaks tlv.RecordT[tlv.TlvType1, tapTweaks]
 
-	// CommitBlob is an optional record that contains an opaque blob that
-	// may be used to properly sweep commitment outputs on a force close
-	// transaction.
-	CommitBlob tlv.OptionalRecordT[tlv.TlvType2, tlv.Blob]
+	// SettledCommitBlob is an optional record that contains an opaque blob
+	// that may be used to properly sweep commitment outputs on a force
+	// close transaction.
+	SettledCommitBlob tlv.OptionalRecordT[tlv.TlvType2, tlv.Blob]
+
+	// BreachCommitBlob is an optional record that contains an opaque blob
+	// used to sweep a remote party's breached output.
+	BreachedCommitBlob tlv.OptionalRecordT[tlv.TlvType3, tlv.Blob]
+
+	// TODO(roasbeef): htlc blobs
 }
 
 // TODO(roasbeef): morph into new tlv record
@@ -53,9 +59,16 @@ func (t *taprootBriefcase) EncodeRecords() []tlv.Record {
 		t.CtrlBlocks.Record(), t.TapTweaks.Record(),
 	}
 
-	t.CommitBlob.WhenSome(func(r tlv.RecordT[tlv.TlvType2, tlv.Blob]) {
-		records = append(records, r.Record())
-	})
+	t.SettledCommitBlob.WhenSome(
+		func(r tlv.RecordT[tlv.TlvType2, tlv.Blob]) {
+			records = append(records, r.Record())
+		},
+	)
+	t.BreachedCommitBlob.WhenSome(
+		func(r tlv.RecordT[tlv.TlvType3, tlv.Blob]) {
+			records = append(records, r.Record())
+		},
+	)
 
 	return records
 }
@@ -79,8 +92,12 @@ func (t *taprootBriefcase) Encode(w io.Writer) error {
 
 // Decode decodes the given reader into the target struct.
 func (t *taprootBriefcase) Decode(r io.Reader) error {
-	commitBlob := t.CommitBlob.Zero()
-	records := append(t.DecodeRecords(), commitBlob.Record())
+	settledCommitBlob := t.SettledCommitBlob.Zero()
+	breachedCommitBlob := t.BreachedCommitBlob.Zero()
+	records := append(
+		t.DecodeRecords(), settledCommitBlob.Record(),
+		breachedCommitBlob.Record(),
+	)
 	stream, err := tlv.NewStream(records...)
 	if err != nil {
 		return err
@@ -91,8 +108,11 @@ func (t *taprootBriefcase) Decode(r io.Reader) error {
 		return err
 	}
 
-	if val, ok := typeMap[t.CommitBlob.TlvType()]; ok && val == nil {
-		t.CommitBlob = tlv.SomeRecordT(commitBlob)
+	if val, ok := typeMap[t.SettledCommitBlob.TlvType()]; ok && val == nil {
+		t.SettledCommitBlob = tlv.SomeRecordT(settledCommitBlob)
+	}
+	if v, ok := typeMap[t.BreachedCommitBlob.TlvType()]; ok && v == nil {
+		t.BreachedCommitBlob = tlv.SomeRecordT(breachedCommitBlob)
 	}
 
 	return nil

contractcourt/taproot_briefcase_test.go

@@ -87,9 +87,12 @@ func TestTaprootBriefcase(t *testing.T) {
 			BreachedHtlcTweaks:            randHtlcTweaks(t),
 			BreachedSecondLevelHltcTweaks: randHtlcTweaks(t),
 		}),
-		CommitBlob: tlv.SomeRecordT(
+		SettledCommitBlob: tlv.SomeRecordT(
 			tlv.NewPrimitiveRecord[tlv.TlvType2](commitBlob[:]),
 		),
+		BreachedCommitBlob: tlv.SomeRecordT(
+			tlv.NewPrimitiveRecord[tlv.TlvType3](commitBlob[:]),
+		),
 	}
 
 	var b bytes.Buffer