enforce name standard after fork height

Author: BrannonKing

blockchain/validate.go

@@ -16,6 +16,8 @@ import (
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
+
+	"github.com/btcsuite/btcd/claimtrie/param"
 )
 
 const (
@@ -547,7 +549,7 @@ func checkBlockSanity(block *btcutil.Block, powLimit *big.Int, timeSource Median
 	// Do some preliminary checks on each transaction to ensure they are
 	// sane before continuing.
 	for _, tx := range transactions {
-		err := CheckTransactionSanity(tx, false)
+		err := CheckTransactionSanity(tx, block.Height() >= param.ActiveParams.GrandForkHeight)
 		if err != nil {
 			return err
 		}