diff --git a/core/block_validator.go b/core/block_validator.go
index e3743680a..e4b96bd2b 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -94,9 +94,23 @@ func (v *BlockValidator) ValidateBody(block *types.WorkObject) error {
 		if hash := types.CalcUncleHash(block.Uncles()); hash != header.UncleHash() {
 			return fmt.Errorf("uncle root hash mismatch: have %x, want %x", hash, header.UncleHash())
 		}
-		if v.hc.ProcessingState() {
-			if hash := types.DeriveSha(block.Transactions(), trie.NewStackTrie(nil)); hash != header.TxHash() {
-				return fmt.Errorf("transaction root hash mismatch: have %x, want %x", hash, header.TxHash())
+		if hash := types.DeriveSha(block.Transactions(), trie.NewStackTrie(nil)); hash != header.TxHash() {
+			return fmt.Errorf("transaction root hash mismatch: have %x, want %x", hash, header.TxHash())
+		}
+		activeLocations := common.NewChainsAdded(v.hc.currentExpansionNumber)
+		for _, tx := range block.Transactions() {
+			if types.QiTxType == tx.Type() {
+				for _, txo := range tx.TxOut() {
+					found := false
+					for _, activeLoc := range activeLocations {
+						if common.IsInChainScope(txo.Address, activeLoc) {
+							found = true
+						}
+					}
+					if !found {
+						return fmt.Errorf("Qi TXO emitted to an inactive chain")
+					}
+				}
 			}
 		}
 		// The header view should have the etxs populated
diff --git a/core/tx_pool.go b/core/tx_pool.go
index d2db17c5c..21c7ad582 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -1276,8 +1276,21 @@ func (pool *TxPool) addQiTxs(txs types.Transactions) []error {
 	if etxPLimit < params.ETXPLimitMin {
 		etxPLimit = params.ETXPLimitMin
 	}
+	activeLocations := common.NewChainsAdded(pool.chain.CurrentBlock().ExpansionNumber())
 	transactionsWithoutErrors := make([]*types.TxWithMinerFee, 0, len(txs))
 	for _, tx := range txs {
+		// Reject TX if it emits an output to an inactive chain
+		for _, txo := range tx.TxOut() {
+			found := false
+			for _, activeLoc := range activeLocations {
+				if common.IsInChainScope(txo.Address, activeLoc) {
+					found = true
+				}
+			}
+			if !found {
+				errs = append(errs, fmt.Errorf("Qi TXO emitted to an inactive chain"))
+			}
+		}
 
 		totalQitIn, err := ValidateQiTxInputs(tx, pool.chain, pool.db, currentBlock, pool.signer, pool.chainconfig.Location, *pool.chainconfig.ChainID)
 		if err != nil {