diff --git a/internal/ethapi/api_flight.go b/internal/ethapi/api_flight.go
index 18b4d54b..7a73d62d 100644
--- a/internal/ethapi/api_flight.go
+++ b/internal/ethapi/api_flight.go
@@ -76,8 +76,8 @@ func (s *PublicFlightAPI) CommitTx(ctx context.Context, args *txtool.GTx) error
 	return s.exchange.CommitTx(ctx, args)
 }
 
-func (s *PublicFlightAPI) Trace2Root(ctx context.Context, tk TKAddress, trace keys.Uint256) (root keys.Uint256, e error) {
-	if r := flight.Trace2Root(tk.ToUint512().NewRef(), &trace); r != nil {
+func (s *PublicFlightAPI) Trace2Root(ctx context.Context, tk TKAddress, trace keys.Uint256, base keys.Uint256) (root keys.Uint256, e error) {
+	if r := flight.Trace2Root(tk.ToUint512().NewRef(), &trace, &base); r != nil {
 		root = *r
 		return
 	} else {
diff --git a/internal/web3ext/web3ext.go b/internal/web3ext/web3ext.go
index a0414d1b..b0c13060 100644
--- a/internal/web3ext/web3ext.go
+++ b/internal/web3ext/web3ext.go
@@ -935,7 +935,7 @@ web3._extend({
 		new web3._extend.Method({
 			name: 'Trace2Root',
 			call: 'flight_trace2Root',
-			params: 2
+			params: 3
 		}),
 		new web3._extend.Method({
 			name: 'getOut',
diff --git a/zero/txtool/flight/sli.go b/zero/txtool/flight/sli.go
index 5b2a35e6..69719c27 100644
--- a/zero/txtool/flight/sli.go
+++ b/zero/txtool/flight/sli.go
@@ -69,12 +69,13 @@ func DecTraceOuts(outs []txtool.Out, skr *keys.PKr) (douts []txtool.TDOut) {
 
 func (self *SLI) GenTx(param *txtool.GTxParam) (gtx txtool.GTx, e error) {
 
-	if tx, keys, err := generate.GenTx(param); err != nil {
+	if tx, keys, bases, err := generate.GenTx(param); err != nil {
 		e = err
 		return
 	} else {
 		gtx.Tx = tx
 		gtx.Keys = keys
+		gtx.Bases = bases
 		gtx.Gas = hexutil.Uint64(param.Gas)
 		gtx.GasPrice = hexutil.Big(*param.GasPrice)
 		gtx.Hash = tx.ToHash()
diff --git a/zero/txtool/flight/sri.go b/zero/txtool/flight/sri.go
index c3b240f4..bd5e01d5 100644
--- a/zero/txtool/flight/sri.go
+++ b/zero/txtool/flight/sri.go
@@ -30,7 +30,7 @@ type SRI struct {
 
 var SRI_Inst = SRI{}
 
-func Trace2Root(tk *keys.Uint512, trace *keys.Uint256) (root *keys.Uint256) {
+func Trace2Root(tk *keys.Uint512, trace *keys.Uint256, base *keys.Uint256) (root *keys.Uint256) {
 	root_cm := cpt.FetchRootCM(tk, trace)
 	root = localdb.GetRootByRootCM(txtool.Ref_inst.Bc.GetDB(), &root_cm)
 	return
diff --git a/zero/txtool/generate/generate.go b/zero/txtool/generate/generate.go
index fe828632..dfb559be 100644
--- a/zero/txtool/generate/generate.go
+++ b/zero/txtool/generate/generate.go
@@ -20,10 +20,11 @@ type gen_ctx struct {
 	Z_Ins        []txtool.GIn
 	balance_desc cpt.BalanceDesc
 	Keys         []keys.Uint256
+	Bases        []keys.Uint256
 	s            stx.T
 }
 
-func GenTx(param *txtool.GTxParam) (ret stx.T, keys []keys.Uint256, e error) {
+func GenTx(param *txtool.GTxParam) (ret stx.T, keys []keys.Uint256, bases []keys.Uint256, e error) {
 	ctx := gen_ctx{}
 	ctx.param = *param
 	ctx.prepare()
@@ -42,6 +43,7 @@ func GenTx(param *txtool.GTxParam) (ret stx.T, keys []keys.Uint256, e error) {
 	}
 	ret = ctx.s
 	keys = ctx.Keys
+	bases = ctx.Bases
 	return
 }
 
diff --git a/zero/txtool/generate/prove_proc.go b/zero/txtool/generate/prove_proc.go
index 445ed9fb..34031a67 100644
--- a/zero/txtool/generate/prove_proc.go
+++ b/zero/txtool/generate/prove_proc.go
@@ -197,7 +197,7 @@ func (self *gen_ctx) genDesc_Zs() (e error) {
 				in_z.Trace = desc.Til_ret
 				in_z.Proof = desc.Proof_ret
 				self.s.Desc_Z.Ins[input_desc.index] = in_z
-
+				self.Bases = append(self.Bases, keys.Empty_Uint256)
 				self.balance_desc.Zin_acms = append(self.balance_desc.Zin_acms, desc.Asset_cm_ret[:]...)
 				self.balance_desc.Zin_ars = append(self.balance_desc.Zin_ars, desc.Ar_ret[:]...)
 			}
diff --git a/zero/txtool/iface.go b/zero/txtool/iface.go
index b2bbfbbd..04f3f081 100644
--- a/zero/txtool/iface.go
+++ b/zero/txtool/iface.go
@@ -29,6 +29,7 @@ type GTx struct {
 	Hash     keys.Uint256
 	Roots    []keys.Uint256
 	Keys     []keys.Uint256
+	Bases    []keys.Uint256
 }
 
 type GPkgCloseCmd struct {