test this shit real quick

database/tbcd/level/level.go

@@ -1973,6 +1973,22 @@ func encodeKeystoneHeightHash(height uint64, hash chainhash.Hash) (e [keystoneHe
 	return
 }
 
+func decodeKeystoneHeightHash(v []byte) (height uint64, hash chainhash.Hash) {
+	if len(v) != keystoneHeightHashSize {
+		panic(fmt.Sprintf("invalid length: %v", len(v)))
+	}
+	if v[0] != 'h' {
+		panic("not a keystone height hash index")
+	}
+	height = binary.BigEndian.Uint64(v[1 : 1+8])
+	h := &hash
+	err := h.SetBytes(v[9:])
+	if err != nil {
+		panic(err)
+	}
+	return
+}
+
 func (l *ldb) BlockKeystoneUpdate(ctx context.Context, direction int, keystones map[chainhash.Hash]tbcd.Keystone, keystoneIndexHash chainhash.Hash) error {
 	log.Tracef("BlockKeystoneUpdate")
 	defer log.Tracef("BlockKeystoneUpdate exit")

database/tbcd/level/upgrade.go

@@ -568,7 +568,7 @@ func (l *ldb) v4(ctx context.Context) error {
 		key := i.Key()
 		value := i.Value()
 		if len(value) != keystoneSize {
-			// Index value, not a keystone
+			// Not a keystone.
 			continue
 		}
 		ks := decodeKeystone(value)
@@ -582,7 +582,16 @@ func (l *ldb) v4(ctx context.Context) error {
 			return fmt.Errorf("hash: %w", err)
 		}
 		ehh := encodeKeystoneHeightHash(bh.Height, *ksHash)
+		x, y := decodeKeystoneHeightHash(ebh)
 		log.Infof("%x: %x -> %x", key, bh.Height, ehh)
+		_ = x
+		_ = y
+		if x != bh.Height {
+			panic("height")
+		}
+		if !y.IsEqual(ksHash) {
+			panic("hash")
+		}
 	}
 	if i.Error() != nil {
 		return fmt.Errorf("keystones iterator: %w", i.Error())