diff --git a/go.mod b/go.mod
index 35056fb..0dc920a 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/itchyny/base58-go v0.1.0
 	github.com/ontio/go-bip32 v0.0.0-20190520025953-d3cea6894a2b
 	github.com/ontio/ontology-crypto v1.0.9
-	github.com/polynetwork/poly v1.9.1-0.20220424092935-f54fa45801fe
+	github.com/polynetwork/poly v1.9.1-0.20220512072724-0d14237fd9a1
 	github.com/stretchr/testify v1.7.0
 	github.com/tyler-smith/go-bip39 v1.0.2
 	golang.org/x/crypto v0.0.0-20211117183948-ae814b36b871
diff --git a/go.sum b/go.sum
index aa9ce30..c0a2c97 100644
--- a/go.sum
+++ b/go.sum
@@ -1057,8 +1057,8 @@ github.com/polynetwork/cosmos-poly-module v0.0.0-20200810030259-95d586518759/go.
 github.com/polynetwork/eth-contracts v0.0.0-20200814062128-70f58e22b014/go.mod h1:TeePrYZfWJAwuksPlie7RPequ51Ujp5l/JY6TcutsFc=
 github.com/polynetwork/poly v0.0.0-20200710095239-0596a3d7afe5/go.mod h1:UzlGEWk0eCGsuMJOZfBoZjRbmu4Yw/SudKAIFe1gPnY=
 github.com/polynetwork/poly v0.0.0-20200715030435-4f1d1a0adb44/go.mod h1:UzlGEWk0eCGsuMJOZfBoZjRbmu4Yw/SudKAIFe1gPnY=
-github.com/polynetwork/poly v1.9.1-0.20220424092935-f54fa45801fe h1:GxB1wJFwQP4wXy7K+BAU1qdyJizEshQbDhHDIz6ljng=
-github.com/polynetwork/poly v1.9.1-0.20220424092935-f54fa45801fe/go.mod h1:wq2hnh/fDL/k27rE3d2SFKBswGmND6IyPKevQJYT1hU=
+github.com/polynetwork/poly v1.9.1-0.20220512072724-0d14237fd9a1 h1:l6cEH3bgXRa9iNRMJLGmfrIl4i5v2bomYOch6+QZNjU=
+github.com/polynetwork/poly v1.9.1-0.20220512072724-0d14237fd9a1/go.mod h1:Jzyw5KKn0VCrcnwrYcs9fdT6NifireXxdTdPV1A0G7M=
 github.com/polynetwork/poly-go-sdk v0.0.0-20200722030827-6875b6018b93/go.mod h1:a1wMo/VFoUAKX2yVjipvFug6Yu5BPhf/2tP5xywqfIc=
 github.com/polynetwork/poly-go-sdk v0.0.0-20200730112529-d9c0c7ddf3d8/go.mod h1:a1wMo/VFoUAKX2yVjipvFug6Yu5BPhf/2tP5xywqfIc=
 github.com/polynetwork/poly-io-test v0.0.0-20200819093740-8cf514b07750/go.mod h1:Y/xz9uHdO0HPz0p+x0bZxNuo1ufVcln3dDjmchSUgso=
@@ -1290,6 +1290,8 @@ github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/yuin/goldmark v1.4.0/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
+github.com/zeebo/assert v1.3.0 h1:g7C04CbJuIDKNPFHmsk4hwZDO5O+kntRxzaUoNXj+IQ=
+github.com/zeebo/assert v1.3.0/go.mod h1:Pq9JiuJQpG8JLJdtkwrJESF0Foym2/D9XMU5ciN/wJ0=
 github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
 github.com/zondax/hid v0.9.0/go.mod h1:l5wttcP0jwtdLjqjMMWFVEE7d1zO0jvSPA9OPZxWpEM=
 github.com/zquestz/grab v0.0.0-20190224022517-abcee96e61b1/go.mod h1:bslhAiUxakrA6z6CHmVyvkfpnxx18RJBwVyx2TluJWw=
diff --git a/native_contract.go b/native_contract.go
index 9f1dae4..83cf134 100644
--- a/native_contract.go
+++ b/native_contract.go
@@ -31,6 +31,7 @@ import (
 	"github.com/polynetwork/poly/native/service/governance/relayer_manager"
 	"github.com/polynetwork/poly/native/service/governance/replenish"
 	"github.com/polynetwork/poly/native/service/governance/side_chain_manager"
+	"github.com/polynetwork/poly/native/service/governance/signature_manager"
 	hsc "github.com/polynetwork/poly/native/service/header_sync/common"
 	mcnsu "github.com/polynetwork/poly/native/service/utils"
 	"github.com/polynetwork/poly/native/states"
@@ -42,6 +43,7 @@ var (
 	SideChainManagerContractAddress  = mcnsu.SideChainManagerContractAddress
 	NodeManagerContractAddress       = mcnsu.NodeManagerContractAddress
 	RelayerManagerContractAddress    = mcnsu.RelayerManagerContractAddress
+	SignatureManagerContractAddress  = mcnsu.SignatureManagerContractAddress
 	ReplenishContractAddress         = mcnsu.ReplenishContractAddress
 )
 
@@ -59,6 +61,7 @@ type NativeContract struct {
 	Scm   *SideChainManager
 	Nm    *NodeManager
 	Rm    *RelayerManager
+	Sm    *SignatureManager
 	Rp    *Replenish
 }
 
@@ -69,6 +72,7 @@ func newNativeContract(mcSdk *PolySdk) *NativeContract {
 	native.Scm = &SideChainManager{native: native, mcSdk: mcSdk}
 	native.Nm = &NodeManager{native: native, mcSdk: mcSdk}
 	native.Rm = &RelayerManager{native: native, mcSdk: mcSdk}
+	native.Sm = &SignatureManager{native: native, mcSdk: mcSdk}
 	native.Rp = &Replenish{native: native, mcSdk: mcSdk}
 	return native
 }
@@ -1114,6 +1118,39 @@ func (this *RelayerManager) ApproveRemoveRelayer(removeID uint64, signer *Accoun
 	return this.mcSdk.SendTransaction(tx)
 }
 
+type SignatureManager struct {
+	mcSdk  *PolySdk
+	native *NativeContract
+}
+
+func (this *SignatureManager) NewAddSignatureTransaction(address common.Address, sideChainID uint64, subject, sig []byte) (*types.Transaction, error) {
+	param := signature_manager.AddSignatureParam{
+		Address:     address,
+		SideChainID: sideChainID,
+		Subject:     subject,
+		Signature:   sig,
+	}
+	sink := common.NewZeroCopySink(nil)
+	param.Serialization(sink)
+	return this.native.NewNativeInvokeTransaction(
+		TX_VERSION,
+		SignatureManagerContractAddress,
+		signature_manager.ADD_SIGNATURE,
+		sink.Bytes())
+}
+
+func (this *SignatureManager) AddSignature(sideChainId uint64, subject, sig []byte, signer *Account) (common.Uint256, error) {
+	tx, err := this.NewAddSignatureTransaction(signer.Address, sideChainId, subject, sig)
+	if err != nil {
+		return common.UINT256_EMPTY, err
+	}
+	err = this.mcSdk.SignToTransaction(tx, signer)
+	if err != nil {
+		return common.UINT256_EMPTY, err
+	}
+	return this.mcSdk.SendTransaction(tx)
+}
+
 func (this *NodeManager) NewCommitDposTransaction() (*types.Transaction, error) {
 
 	return this.native.NewNativeInvokeTransaction(