diff --git a/.github/workflows/ci-image.yml b/.github/workflows/ci-image.yml
new file mode 100644
index 0000000..2a4a60f
--- /dev/null
+++ b/.github/workflows/ci-image.yml
@@ -0,0 +1,39 @@
+name: CI - Release
+
+on:
+  push:
+
+jobs:
+  release-image:
+    permissions:
+      id-token: write
+      contents: write
+    runs-on: docker
+    steps:
+      - name: 'Checkout scm ${{ inputs.commitOrTag }}'
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ inputs.commitOrTag }}
+
+      - name: Image tag
+        id: set-tag
+        run: echo "tag=$(git rev-parse --short=7 HEAD)" >> $GITHUB_OUTPUT
+        shell: bash
+
+      - name: Build Docker images
+        run: docker build -t zilliqa/zilliqa-relayer:experimental-${{ steps.set-tag.outputs.tag }} -t zilliqa/zilliqa-relayer:latest .
+        shell: bash
+
+      - name: Login to the DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Push Docker images to Dockerhub
+        if: github.actor != 'dependabot[bot]' && github.ref_name == 'main'
+        run: |
+          docker push zilliqa/zilliqa-relayer:experimental-${{ steps.set-tag.outputs.tag }}
+          docker push zilliqa/zilliqa-relayer:latest
+        shell: bash
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a7f71c6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+*~
+\#*
+.\#*
+zilliqa-relayer
+.idea
+bolt.bin
+config.local.yaml
+constants.xml
+cross_chain_manager_admin.json
+xiaohuo.wallet
+zilliqa.wallet
+poly.wallet
+relayer.wallet
+secrets
+config.devnet.yaml
+config.testnet.yaml
+config.production.yaml
+target_contracts_local.json
+target_contracts_devnet.json
+target_contracts_production.json
+audit.log
+zil_relayer
+wallet.dat
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..038b8bd
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,14 @@
+FROM golang:1.15 AS build
+WORKDIR /app/zilliqa-relayer
+COPY . ./
+RUN go build
+#RUN git clone https://github.com/Zilliqa/zilliqa-relayer.git  && \
+#    cd zilliqa-relayer && \
+#    go build
+
+FROM ubuntu:18.04
+RUN apt-get update && apt-get install -y ca-certificates
+WORKDIR /app
+COPY run.sh run.sh
+COPY --from=build /app/zilliqa-relayer/zilliqa-relayer zilliqa-relayer
+ENTRYPOINT ["/bin/bash", "run.sh"]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..4e61c8d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+     GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
index 5274f53..ee4e691 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,135 @@
-# zilliqa-relayer
\ No newline at end of file
+# zilliqa-relayer
+
+*This program is still under developing!*
+
+Zilliqa Relayer is an important character of Poly cross-chain interactive protocol which is responsible for relaying cross-chain transaction from and to Zilliqa.
+
+## Build From Source
+
+### Prerequisites
+
+- [Golang](https://golang.org/doc/install) version 1.14 or later
+
+### Build
+
+```shell
+git clone https://github.com/polynetwork/zil-relayer.git
+cd zil-relayer
+./build.sh
+```
+
+After building the source code successfully,  you should see the executable program `zilliqa-relayer`.
+
+### Build Docker Image
+
+```
+docker build -t polynetwork/zilliqa-relayer .
+```
+
+This command will copy config.yaml to /app/config.yaml in the image. So you need to prepare config.yaml before running this command and you should start the zilliqa-relayer in container basing on the configuration in /app/config.yaml.
+
+
+## Run Relayer
+Before you can run the relayer you will need to create a wallet file of PolyNetwork by running(build Poly CLI first):
+
+```shell
+./poly account add -d
+```
+
+After creation, you need to register it as a Relayer to Poly net and get consensus nodes approving your registeration. And then you can send transaction to Poly net and start relaying.
+
+Before running, you need feed the configuration file `config.yaml`.
+
+`practice_only: true` will stop the relayer sending any actual transactions - it just prints what it would have done.
+`debug: true` will produce a bunch of debug info useful when debugging ZilBridge sync.
+
+```yaml
+practice_only: false
+debug: true
+zil_config:
+  zil_api: https://api.zilliqa.com
+  zil_chain_id: 111
+  zil_message_version: 1
+  zil_force_height: 0
+  zil_monitor_interval: 10
+  zil_headers_per_batch: 2
+  corss_chain_manager_address: zil1tjru7m5zdn3x6k0t72nzmmpz62e5qds62nte9t
+  cross_chain_manager_proxy_address: zil1n7wkwr0xxslwsrhnqtjrwlus80dp5ncnlpaw93
+  side_chain_id: 85
+  key_store_path: zilliqa.wallet
+  key_store_pwd_set:
+    6c89b62d65dc632e259b96f7ae2f1d68a27e3383: ""
+poly_config:
+  poly_wallet_file: poly.wallet
+  poly_wallet_pwd:
+  poly_start_height: 0
+  poly_monitor_interval: 2
+  entrance_contract_address: "0300000000000000000000000000000000000000"
+  rest_url: http://poly.com
+target_contracts: target_contracts.json
+db_path: persistence
+```
+
+A sample keystore file could be:
+
+```text
+{"address":"7d48043742a1103042d327111746531ca26be9be","id":"6cd445ed-8f5f-4565-af2a-cc2306a82b73","version":3,"crypto":{"cipher":"aes-128-ctr","ciphertext":"d136660a4e5664709031ebc162616556e8c812ab37d0157ea3276aa08d0a6c2d","kdf":"pbkdf2","mac":"b30dd459f1fd9d99c0b2f3452ccd2bf11414ad92d32ac70d1d7b52f17281b4e5","cipherparams":{"iv":"6a14f95c8cbafe7d1f317bec88e9d1b8"},"kdfparams":{"n":8192,"c":262144,"r":8,"p":1,"dklen":32,"salt":"c4939e7cead32935d1972a2cd06d249dd501181e6ad2d1872fa0eb397d7fea20"}}}
+```
+# Relayer Container Administration
+## Running the Relayer Container 
+### Prerequisites:
+If you are running via docker-compose, you'll need to install docker-compose first via the following guide:
+```
+https://docs.docker.com/compose/install/
+```
+
+You need the following files and folders created: <br />
+If persistence is already created:
+```
+./persistence/bolt.bin
+```
+If persistence folder is not created:
+```
+create a folder named 'persistence'. The container will use that folder to store the bolt.bin file.
+```
+Configuration Files:
+```
+secrets/config.local.yaml
+secrets/target_contracts.json
+secrets/poly.wallet
+secrets/zilliqa.wallet
+```
+### Running Relayer via Docker Container
+```
+./docker-run
+```
+
+### Running Relayer via Docker Compose
+```
+docker-compose up -d
+```
+## Stopping the Relayer
+### Stopping Relayer via Docker Container
+```
+docker stop zilliqa-relayer && docker rm zilliqa-relayer
+```
+### Stopping Relayer via Docker Compose
+```
+docker-compose down
+```
+## Getting logs
+```
+docker logs -f zilliqa-relayer
+```
+
+
+## Other Resources
+
+- [zilliqa cross chain manager proxy](https://github.com/Zilliqa/zilliqa-contracts/blob/main/contracts/ZilCrossChainManagerProxy.scilla)
+- [zilliqa cross chain manager](https://github.com/Zilliqa/zilliqa-contracts/blob/main/contracts/ZilCrossChainManager.scilla)
+- [zilliqa lock proxy](https://github.com/Zilliqa/zilliqa-contracts/blob/main/contracts/LockProxy.scilla)
+- [polynetwork](https://github.com/polynetwork/poly)
+
+
+
+
diff --git a/build-docker.sh b/build-docker.sh
new file mode 100755
index 0000000..deab546
--- /dev/null
+++ b/build-docker.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+docker build -t polynetwork/zilliqa-relayer .
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..b972750
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+go build
\ No newline at end of file
diff --git a/cmd/root.go b/cmd/root.go
new file mode 100644
index 0000000..506ea8f
--- /dev/null
+++ b/cmd/root.go
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package cmd
+
+import (
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	"os"
+)
+
+var RootCmd = &cobra.Command{
+	Use:   "zilliqa-relayer",
+	Short: "To run zilliqa relayer for poly network",
+	Long:  `To run zilliqa relayer for poly network`,
+	Run: func(cmd *cobra.Command, args []string) {
+	},
+}
+
+func Execute() {
+	if err := RootCmd.Execute(); err != nil {
+		log.Error(err)
+		os.Exit(1)
+	}
+}
diff --git a/cmd/run.go b/cmd/run.go
new file mode 100644
index 0000000..00eb5ca
--- /dev/null
+++ b/cmd/run.go
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package cmd
+
+import (
+	"encoding/json"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	poly_go_sdk "github.com/polynetwork/poly-go-sdk"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/db"
+	"github.com/polynetwork/zilliqa-relayer/service"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"io/ioutil"
+	"os"
+	"path"
+)
+
+var cfgFile string
+
+func init() {
+	cobra.OnInitialize(initConfig)
+	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
+
+	RootCmd.AddCommand(runCmd)
+	log.SetFormatter(&log.TextFormatter{
+		FullTimestamp: true,
+	})
+}
+
+func initConfig() {
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	} else {
+		viper.AddConfigPath("./")
+		viper.SetConfigName("config.local")
+	}
+
+	viper.AutomaticEnv()
+
+	err := viper.ReadInConfig()
+	if err == nil {
+		log.Info("Using config file:", viper.ConfigFileUsed())
+	} else {
+		log.Error(err.Error())
+	}
+}
+
+func setUpPoly(poly *poly_go_sdk.PolySdk, RpcAddr string) error {
+	poly.NewRpcClient().SetAddress(RpcAddr)
+	hdr, err := poly.GetHeaderByHeight(0)
+	if err != nil {
+		return err
+	}
+	poly.SetChainId(hdr.ChainID)
+	return nil
+}
+
+func checkIfExist(dir string) bool {
+	_, err := os.Stat(dir)
+	if err != nil && !os.IsExist(err) {
+		return false
+	}
+	return true
+}
+
+var runCmd = &cobra.Command{
+	Use:   "run",
+	Short: "Run zilliqa relayer",
+	Long:  `Run zilliqa relayer`,
+	Run: func(cmd *cobra.Command, args []string) {
+		viper.SetDefault("debug", false)
+		viper.SetDefault("practiceOnly", false)
+		debugInfo := viper.GetBool("debug")
+		practiceOnly := viper.GetBool("practice_only")
+		zilConfigMap := viper.GetStringMap("zil_config")
+		targetContractsPath := viper.GetString("target_contracts")
+		dbPath := viper.GetString("db_path")
+		removeDb := viper.GetBool("remove_db")
+		bytes, e := ioutil.ReadFile(targetContractsPath)
+		if e != nil {
+			log.Errorf("read target contracts error: %s, path: %s\n", e.Error(), targetContractsPath)
+			return
+		}
+		var targetContract []map[string]map[string][]uint64
+		e2 := json.Unmarshal(bytes, &targetContract)
+		if e2 != nil {
+			log.Errorf("unmarshal target contracts error: %s\n", e2.Error())
+			return
+		}
+		log.Info(targetContract)
+		zilConfig := &config.ZILConfig{
+			ZilApiEndpoint:                 zilConfigMap["zil_api"].(string),
+			ZilChainId:                     zilConfigMap["zil_chain_id"].(int),
+			ZilMessageVersion:              zilConfigMap["zil_message_version"].(int),
+			ZilForceHeight:                 uint64(zilConfigMap["zil_force_height"].(int)),
+			ZilMonitorInterval:             uint32(zilConfigMap["zil_monitor_interval"].(int)),
+			ZilHeadersPerBatch:             uint32(zilConfigMap["zil_headers_per_batch"].(int)),
+			SideChainId:                    uint64(zilConfigMap["side_chain_id"].(int)),
+			CrossChainManagerContract:      zilConfigMap["corss_chain_manager_address"].(string),
+			CrossChainManagerProxyContract: zilConfigMap["cross_chain_manager_proxy_address"].(string),
+			MaxExistTxEpoch:                zilConfigMap["max_exist_tx_epoch"].(int),
+			KeyStorePath:                   zilConfigMap["key_store_path"].(string),
+			KeyStorePwdSet:                 zilConfigMap["key_store_pwd_set"].(map[string]interface{}),
+		}
+
+		polyConfigMap := viper.GetStringMap("poly_config")
+
+		polyConfig := &config.POLYConfig{
+			PolyWalletFile:          polyConfigMap["poly_wallet_file"].(string),
+			PolyWalletPassword:      polyConfigMap["poly_wallet_pwd"].(string),
+			PolyStartHeight:         uint32(polyConfigMap["poly_start_height"].(int)),
+			PolyMonitorInterval:     uint32(polyConfigMap["poly_monitor_interval"].(int)),
+			EntranceContractAddress: polyConfigMap["entrance_contract_address"].(string),
+			RestUrl:                 polyConfigMap["rest_url"].(string),
+		}
+
+		cfg := &config.Config{
+			ZilConfig:       zilConfig,
+			PolyConfig:      polyConfig,
+			TargetContracts: targetContract,
+			Path:            dbPath,
+			RemoveDB:        removeDb,
+		}
+
+		cfgStr, _ := json.Marshal(cfg)
+		log.Infof("config file: %s\n", cfgStr)
+
+		zilSdk := provider.NewProvider(cfg.ZilConfig.ZilApiEndpoint)
+		polySdk := poly_go_sdk.NewPolySdk()
+		err1 := setUpPoly(polySdk, cfg.PolyConfig.RestUrl)
+		if err1 != nil {
+			log.Errorf("init poly sdk error: %s\n", err1.Error())
+			return
+		}
+
+		if cfg.RemoveDB {
+			os.Remove(path.Join(cfg.Path, "bolt.bin"))
+		}
+
+		if !checkIfExist(cfg.Path) {
+			os.Mkdir(cfg.Path, os.ModePerm)
+		}
+		boltDB, err2 := db.NewBoltDB(cfg.Path)
+		if err2 != nil {
+			log.Errorf("cannot init bolt db: %s\n", err2.Error())
+			return
+		}
+
+		// zil to poly
+		zilliqaManager, err := service.NewZilliqaSyncManager(cfg, zilSdk, polySdk, boltDB, debugInfo, practiceOnly)
+		if err != nil {
+			log.Errorf("init zilliqamanger error: %s\n", err.Error())
+			return
+		}
+		// poly to zil
+		polyManager, err1 := service.NewPolySyncManager(cfg, zilSdk, polySdk, boltDB, cfg.ZilConfig.CrossChainManagerContract, cfg.ZilConfig.CrossChainManagerProxyContract)
+		if err1 != nil {
+			log.Errorf("init polymanager error: %s\n", err1.Error())
+			return
+		}
+
+		zilliqaManager.Run(true)
+		polyManager.Run(true)
+
+		service.WaitToExit()
+
+	},
+}
diff --git a/config.yaml b/config.yaml
new file mode 100644
index 0000000..b4660a1
--- /dev/null
+++ b/config.yaml
@@ -0,0 +1,23 @@
+zil_config:
+  zil_api: https://api.zilliqa.com
+  zil_chain_id: 111
+  zil_message_version: 1
+  zil_force_height: 0
+  zil_monitor_interval: 10
+  zil_headers_per_batch: 2
+  corss_chain_manager_address: zil1tjru7m5zdn3x6k0t72nzmmpz62e5qds62nte9t
+  cross_chain_manager_proxy_address: zil1n7wkwr0xxslwsrhnqtjrwlus80dp5ncnlpaw93
+  side_chain_id: 85
+  key_store_path: zilliqa.wallet
+  max_exist_tx_epoch: 5
+  key_store_pwd_set:
+    6c89b62d65dc632e259b96f7ae2f1d68a27e3383: ""
+poly_config:
+  poly_wallet_file: poly.wallet
+  poly_wallet_pwd:
+  poly_start_height: 0
+  poly_monitor_interval: 2
+  entrance_contract_address: "0300000000000000000000000000000000000000"
+  rest_url: http://poly.com
+target_contracts: target_contracts.json
+remove_db: false
\ No newline at end of file
diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..511c930
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package config
+
+const (
+	OntUsefulBlockNum = 1
+)
+
+type Config struct {
+	ZilConfig       *ZILConfig
+	PolyConfig      *POLYConfig
+	Path            string
+	RemoveDB        bool
+	TargetContracts []map[string]map[string][]uint64
+}
+
+type ZILConfig struct {
+	ZilApiEndpoint                 string
+	ZilChainId                     int
+	ZilMessageVersion              int
+	ZilMonitorInterval             uint32
+	ZilHeadersPerBatch             uint32
+	ZilForceHeight                 uint64
+	SideChainId                    uint64
+	CrossChainManagerContract      string
+	CrossChainManagerProxyContract string
+	MaxExistTxEpoch                int
+	KeyStorePath                   string
+	KeyStorePwdSet                 map[string]interface{}
+}
+
+type POLYConfig struct {
+	PolyWalletFile          string
+	PolyWalletPassword      string
+	PolyStartHeight         uint32
+	PolyMonitorInterval     uint32
+	EntranceContractAddress string
+	RestUrl                 string
+}
diff --git a/db/db.go b/db/db.go
new file mode 100644
index 0000000..e21d1cf
--- /dev/null
+++ b/db/db.go
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package db
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"github.com/boltdb/bolt"
+	"path"
+	"strings"
+	"sync"
+)
+
+const MAX_NUM = 1000
+
+type BoltDB struct {
+	rwLock   *sync.RWMutex
+	db       *bolt.DB
+	filePath string
+}
+
+var (
+	BKTCheck  = []byte("Check")
+	BKTRetry  = []byte("Retry")
+	BKTHeight = []byte("Height")
+)
+
+func NewBoltDB(filePath string) (*BoltDB, error) {
+	if !strings.Contains(filePath, ".bin") {
+		filePath = path.Join(filePath, "bolt.bin")
+	}
+
+	w := new(BoltDB)
+	db, err := bolt.Open(filePath, 0644, &bolt.Options{InitialMmapSize: 500000})
+	if err != nil {
+		return nil, err
+	}
+
+	w.db = db
+	w.rwLock = new(sync.RWMutex)
+	w.filePath = filePath
+
+	// poly check
+	if err = db.Update(func(btx *bolt.Tx) error {
+		_, err := btx.CreateBucketIfNotExists(BKTCheck)
+		if err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	// poly retry
+	if err = db.Update(func(btx *bolt.Tx) error {
+		_, err := btx.CreateBucketIfNotExists(BKTRetry)
+		if err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	// poly check
+	if err = db.Update(func(btx *bolt.Tx) error {
+		_, err := btx.CreateBucketIfNotExists(BKTHeight)
+		if err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	return w, nil
+}
+
+func (w *BoltDB) PutRetry(k []byte) error {
+	w.rwLock.Lock()
+	defer w.rwLock.Unlock()
+
+	return w.db.Update(func(btx *bolt.Tx) error {
+		bucket := btx.Bucket(BKTRetry)
+		err := bucket.Put(k, []byte{0x00})
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
+func (w *BoltDB) DeleteRetry(k []byte) error {
+	w.rwLock.Lock()
+	defer w.rwLock.Unlock()
+
+	return w.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket(BKTRetry)
+		err := bucket.Delete(k)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}
+
+func (w *BoltDB) PutCheck(txHash string, v []byte) error {
+	w.rwLock.Lock()
+	defer w.rwLock.Unlock()
+
+	k, err := hex.DecodeString(txHash)
+	if err != nil {
+		return err
+	}
+	return w.db.Update(func(btx *bolt.Tx) error {
+		bucket := btx.Bucket(BKTCheck)
+		err := bucket.Put(k, v)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
+func (w *BoltDB) GetAllRetry() ([][]byte, error) {
+	w.rwLock.Lock()
+	defer w.rwLock.Unlock()
+
+	retryList := make([][]byte, 0)
+	err := w.db.Update(func(tx *bolt.Tx) error {
+		bw := tx.Bucket(BKTRetry)
+		bw.ForEach(func(k, _ []byte) error {
+			_k := make([]byte, len(k))
+			copy(_k, k)
+			retryList = append(retryList, _k)
+			if len(retryList) >= MAX_NUM {
+				return fmt.Errorf("max num")
+			}
+			return nil
+		})
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return retryList, nil
+}
+
+func (w *BoltDB) UpdatePolyHeight(h uint32) error {
+	w.rwLock.Lock()
+	defer w.rwLock.Unlock()
+
+	raw := make([]byte, 4)
+	binary.LittleEndian.PutUint32(raw, h)
+
+	return w.db.Update(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket(BKTHeight)
+		return bkt.Put([]byte("poly_height"), raw)
+	})
+}
+
+func (w *BoltDB) GetPolyHeight() uint32 {
+	w.rwLock.RLock()
+	defer w.rwLock.RUnlock()
+
+	var h uint32
+	_ = w.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket(BKTHeight)
+		raw := bkt.Get([]byte("poly_height"))
+		if len(raw) == 0 {
+			h = 0
+			return nil
+		}
+		h = binary.LittleEndian.Uint32(raw)
+		return nil
+	})
+	return h
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..157d6e4
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,11 @@
+version: "3.9"
+services:
+  zilliqa-relayer:
+    container_name: zilliqa-relayer
+    build: .
+    volumes:
+      - ./persistence:/app/persistence
+      - ./secrets/config.local.yaml:/app/config.local.yaml
+      - ./secrets/target_contracts.json:/app/target_contracts.json
+      - ./secrets/poly.wallet:/app/poly.wallet
+      - ./secrets/zilliqa.wallet:/app/zilliqa.wallet
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..ed342e2
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,21 @@
+module github.com/polynetwork/zilliqa-relayer
+
+go 1.15
+
+require (
+	github.com/Zilliqa/gozilliqa-sdk v1.2.1-0.20210927032600-4c733f2cb879
+	github.com/boltdb/bolt v1.3.1
+	github.com/btcsuite/btcd v0.20.1-beta
+	github.com/cmars/basen v0.0.0-20150613233007-fe3947df716e // indirect
+	github.com/ethereum/go-ethereum v1.9.24 // indirect
+	github.com/magiconair/properties v1.8.1
+	github.com/ontio/ontology v1.11.0
+	github.com/ontio/ontology-crypto v1.0.9
+	github.com/polynetwork/poly v0.0.0-20200715030435-4f1d1a0adb44
+	github.com/polynetwork/poly-go-sdk v0.0.0-20200817120957-365691ad3493
+	github.com/sirupsen/logrus v1.7.0
+	github.com/spf13/cobra v1.1.1
+	github.com/spf13/viper v1.7.0
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	launchpad.net/gocheck v0.0.0-20140225173054-000000000087 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..08f2f03
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,900 @@
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+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/hooks/post_push b/hooks/post_push
new file mode 100644
index 0000000..4575c25
--- /dev/null
+++ b/hooks/post_push
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+if [ $SOURCE_BRANCH == "main" ]; then
+    docker tag $IMAGE_NAME $DOCKER_REPO:experimental-${SOURCE_COMMIT:0:7}
+    docker push $DOCKER_REPO:experimental-${SOURCE_COMMIT:0:7}
+fi
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..56deda4
--- /dev/null
+++ b/main.go
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import "github.com/polynetwork/zilliqa-relayer/cmd"
+
+func main() {
+	cmd.Execute()
+}
diff --git a/run-docker.sh b/run-docker.sh
new file mode 100755
index 0000000..9a53340
--- /dev/null
+++ b/run-docker.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+docker stop zilliqa-relayer
+docker rm zilliqa-relayer
+
+docker run -d \
+-v $(pwd)/persistence:/app/persistence \
+-v $(pwd)/secrets/config.local.yaml:/app/config.local.yaml \
+-v $(pwd)/secrets/target_contracts.json:/app/target_contracts.json \
+-v $(pwd)/secrets/poly.wallet:/app/poly.wallet \
+-v $(pwd)/secrets/zilliqa.wallet:/app/zilliqa.wallet \
+--name zilliqa-relayer polynetwork/zilliqa-relayer 
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..052a2ce
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+./zilliqa-relayer run
\ No newline at end of file
diff --git a/service/common.go b/service/common.go
new file mode 100644
index 0000000..47be13e
--- /dev/null
+++ b/service/common.go
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	log "github.com/sirupsen/logrus"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func WaitToExit() {
+	exit := make(chan bool, 0)
+	sc := make(chan os.Signal, 1)
+	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
+	go func() {
+		for sig := range sc {
+			log.Infof("Zilliqa Relayer received exit signal: %v.", sig.String())
+			close(exit)
+			break
+		}
+	}()
+	<-exit
+}
diff --git a/service/nonce_manager.go b/service/nonce_manager.go
new file mode 100644
index 0000000..d714ac6
--- /dev/null
+++ b/service/nonce_manager.go
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"encoding/json"
+	"github.com/Zilliqa/gozilliqa-sdk/keytools"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	"github.com/Zilliqa/gozilliqa-sdk/transaction"
+	"github.com/Zilliqa/gozilliqa-sdk/util"
+	polytypes "github.com/polynetwork/poly/core/types"
+	common2 "github.com/polynetwork/poly/native/service/cross_chain_manager/common"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/tools"
+	log "github.com/sirupsen/logrus"
+	"math"
+	"strconv"
+	"sync"
+	"time"
+)
+
+const AuditLogFile = "audit.log"
+
+type NonceAndSender struct {
+	Sender     *ZilSender
+	LocalNonce int64
+}
+
+type TransactionWithAge struct {
+	Txn          *transaction.Transaction
+	StartTxBlock uint64
+	Age          int
+}
+
+type NonceManager struct {
+	UpdateInterval int64
+	ZilClient      *provider.Provider
+	// address => hash => transaction
+	SentTransactions    map[string]map[string]TransactionWithAge
+	LockSentTransaction sync.Mutex
+	// address => list of transaction hash
+	ConfirmedTransactions map[string][]string
+	// private key => nonce and sender
+	ZilSenderMap      map[string]*NonceAndSender
+	SenderPrivateKeys []string
+	CurrentIndex      int
+	Cfg               *config.Config
+}
+
+func (nm *NonceManager) Run() {
+	log.Infof("starting nonce manager...")
+	for {
+		time.Sleep(time.Second * time.Duration(nm.UpdateInterval))
+		nm.stat()
+	}
+}
+
+func (nm *NonceManager) commitHeader(hdr *polytypes.Header) bool {
+	nm.LockSentTransaction.Lock()
+	defer nm.LockSentTransaction.Unlock()
+	currentSenderPrivateKey := nm.SenderPrivateKeys[nm.CurrentIndex]
+	nm.CurrentIndex++
+	if nm.CurrentIndex > len(nm.SenderPrivateKeys)-1 {
+		nm.CurrentIndex = 0
+	}
+	currentSender := nm.ZilSenderMap[currentSenderPrivateKey].Sender
+	log.Infof("NonceManager - commitHeader use sender %s", currentSender.address)
+	nonce := strconv.FormatUint(uint64(nm.ZilSenderMap[currentSenderPrivateKey].LocalNonce+1), 10)
+	txn, err := currentSender.commitHeaderWithNonce(hdr, nonce)
+	if err != nil {
+		log.Warnf("NonceManager - commitHeader error %s", err.Error())
+		return false
+	}
+
+	hash, _ := txn.Hash()
+
+	// handle nonce
+	nm.ZilSenderMap[currentSenderPrivateKey] = &NonceAndSender{
+		Sender:     nm.ZilSenderMap[currentSenderPrivateKey].Sender,
+		LocalNonce: nm.ZilSenderMap[currentSenderPrivateKey].LocalNonce + 1,
+	}
+
+	outerMap := nm.SentTransactions[currentSender.address]
+	if outerMap == nil {
+		outerMap = make(map[string]TransactionWithAge)
+	}
+	outerMap[util.EncodeHex(hash)] = TransactionWithAge{
+		Txn: txn,
+		Age: 0,
+	}
+	nm.SentTransactions[currentSender.address] = outerMap
+	return true
+}
+
+type TransactionAuditLog struct {
+	Time    time.Time
+	PayLoad string
+	Error   string
+}
+
+func (nm *NonceManager) commitDepositEventsWithHeader(header *polytypes.Header, param *common2.ToMerkleValue, headerProof string, anchorHeader *polytypes.Header, polyTxHash string, rawAuditPath []byte) bool {
+	nm.LockSentTransaction.Lock()
+	defer nm.LockSentTransaction.Unlock()
+	currentSenderPrivateKey := nm.SenderPrivateKeys[nm.CurrentIndex]
+	nm.CurrentIndex++
+	if nm.CurrentIndex > len(nm.SenderPrivateKeys)-1 {
+		nm.CurrentIndex = 0
+	}
+
+	currentSender := nm.ZilSenderMap[currentSenderPrivateKey].Sender
+	log.Infof("NonceManager - commitDepositEventsWithHeader use sender %s", currentSender.address)
+	nonce := strconv.FormatUint(uint64(nm.ZilSenderMap[currentSenderPrivateKey].LocalNonce+1), 10)
+	txn, err := currentSender.commitDepositEventsWithHeaderWithNonce(header, param, headerProof, anchorHeader, polyTxHash, rawAuditPath, nonce)
+	var auditLog TransactionAuditLog
+	if err != nil {
+		auditLog = TransactionAuditLog{
+			Time:  time.Now(),
+			Error: err.Error(),
+		}
+	} else {
+		transactionRaw, _ := json.Marshal(txn)
+		auditLog = TransactionAuditLog{
+			Time:    time.Now(),
+			PayLoad: string(transactionRaw),
+		}
+	}
+
+	auditLogRaw, _ := json.Marshal(auditLog)
+	tools.AppendToFile(AuditLogFile, string(auditLogRaw))
+
+	if err != nil {
+		log.Warnf("NonceManager - commitDepositEventsWithHeaderWithNonc e error %s", err.Error())
+		return false
+	}
+
+	hash, _ := txn.Hash()
+
+	// handle nonce
+	nm.ZilSenderMap[currentSenderPrivateKey] = &NonceAndSender{
+		Sender:     nm.ZilSenderMap[currentSenderPrivateKey].Sender,
+		LocalNonce: nm.ZilSenderMap[currentSenderPrivateKey].LocalNonce + 1,
+	}
+
+	outerMap := nm.SentTransactions[currentSender.address]
+	if outerMap == nil {
+		outerMap = make(map[string]TransactionWithAge)
+	}
+	outerMap[util.EncodeHex(hash)] = TransactionWithAge{
+		Txn: txn,
+		Age: 0,
+	}
+	nm.SentTransactions[currentSender.address] = outerMap
+	return true
+}
+
+func (nm *NonceManager) stat() {
+	txBlock, err := nm.ZilClient.GetLatestTxBlock()
+	if err != nil {
+		log.Warnf("NonceManager - get current tx block number error: %s", err.Error())
+		return
+	}
+	currentTxEpoch, _ := strconv.ParseUint(txBlock.Header.BlockNum, 10, 64)
+	log.Infof("NonceManager - current tx block number is: %s", txBlock.Header.BlockNum)
+	nm.LockSentTransaction.Lock()
+	defer nm.LockSentTransaction.Unlock()
+	for _, key := range nm.SenderPrivateKeys {
+		addr := keytools.GetAddressFromPrivateKey(util.DecodeHex(key))
+		balAndNonce, err := nm.ZilClient.GetBalance(addr)
+		if err != nil {
+			log.Warnf("NonceManager - get nonce for address %s error %s", addr, err.Error())
+			continue
+		}
+
+		// print some stat info about this address
+		log.Infof("NonceManager - address %s, local nonce = %d, remote nonce = %d", addr, nm.ZilSenderMap[key].LocalNonce, balAndNonce.Nonce)
+		log.Infof("NonceManager - sent transactions: %+v", nm.SentTransactions[addr])
+		log.Infof("NonceManager - confimred transactions: %+v", len(nm.ConfirmedTransactions[addr]))
+
+		// check sent transactions
+		log.Infof("NonceManager - check sent transactions")
+		var confirmedTxn []string
+
+		sentTransactionMap := nm.SentTransactions[addr]
+		for hash, txn := range sentTransactionMap {
+			log.Infof("NonceManager - check transaction %s", hash)
+			_, err := nm.ZilClient.GetTransaction(hash)
+
+			if err == nil {
+				log.Infof("NonceManager - transaction %s confirmed", hash)
+				confirmedTxn = append(confirmedTxn, hash)
+			} else {
+				// if start block is 0, try to give it a number first
+				if sentTransactionMap[hash].StartTxBlock == 0 {
+					log.Infof("NonceManager - stat try to determine start tx block for hash: %s", hash)
+					sentTransactionMap[hash] = TransactionWithAge{
+						Txn:          txn.Txn,
+						StartTxBlock: currentTxEpoch,
+						Age:          0,
+					}
+				} else {
+					log.Warnf("NonceManager - stat already has inserted epoch, update age, hash is %s", hash)
+					age := 0
+					if currentTxEpoch > sentTransactionMap[hash].StartTxBlock {
+						age = int(currentTxEpoch - sentTransactionMap[hash].StartTxBlock)
+					}
+					sentTransactionMap[hash] = TransactionWithAge{
+						Txn:          txn.Txn,
+						StartTxBlock: txn.StartTxBlock,
+						Age:          age,
+					}
+				}
+			}
+
+		}
+
+		for _, hash := range confirmedTxn {
+			delete(sentTransactionMap, hash)
+			nm.ConfirmedTransactions[addr] = append(nm.ConfirmedTransactions[addr], hash)
+		}
+		nm.SentTransactions[addr] = sentTransactionMap
+
+		// print some stat info about this address again
+		log.Infof("NonceManager - sent transactions: %+v", nm.SentTransactions[addr])
+		log.Infof("NonceManager - confimred transactions: %+v", len(nm.ConfirmedTransactions[addr]))
+
+		// detect dead transactions
+		log.Infof("NonceManager - stat start to detect dead transactions")
+		currentNonce := uint64(math.MaxUint64)
+		for hash, txn := range nm.SentTransactions[addr] {
+			if txn.Age > nm.Cfg.ZilConfig.MaxExistTxEpoch {
+				log.Warnf("NonceManager - stat found dead transaction, hash: %s, nonce is %s", hash, txn.Txn.Nonce)
+				log.Warnf("NonceManager - stat current nonce is: %d", currentNonce)
+				nonce, _ := strconv.ParseUint(txn.Txn.Nonce, 10, 64)
+				if currentNonce > nonce {
+					log.Warnf("NonceManager - stat replace current nonce with it")
+					currentNonce = nonce
+				}
+			}
+		}
+
+		if currentNonce == math.MaxUint64 {
+			log.Infof("NonceManager - stat no dead found")
+		} else {
+			log.Infof("NonceManager - stat dead transaction, bad nonce is: %d, start to resend transactions", currentNonce)
+			for hash, txn := range nm.SentTransactions[addr] {
+				nonce, _ := strconv.ParseUint(txn.Txn.Nonce, 10, 64)
+				if nonce >= currentNonce {
+					log.Infof("NonceManager - stat start to resend transaction %s, nonce %d", hash, nonce)
+					// todo handle error
+					nm.ZilClient.CreateTransaction(txn.Txn.ToTransactionPayload())
+					nm.SentTransactions[addr][hash] = TransactionWithAge{
+						Txn:          txn.Txn,
+						StartTxBlock: currentTxEpoch,
+						Age:          0,
+					}
+				}
+			}
+
+		}
+	}
+}
diff --git a/service/poly2zil.go b/service/poly2zil.go
new file mode 100644
index 0000000..4cbd4bc
--- /dev/null
+++ b/service/poly2zil.go
@@ -0,0 +1,274 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"github.com/Zilliqa/gozilliqa-sdk/bech32"
+	"github.com/Zilliqa/gozilliqa-sdk/util"
+	"github.com/polynetwork/poly/common"
+	"github.com/polynetwork/poly/consensus/vbft/config"
+	polytypes "github.com/polynetwork/poly/core/types"
+	common2 "github.com/polynetwork/poly/native/service/cross_chain_manager/common"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/tools"
+	log "github.com/sirupsen/logrus"
+	"strconv"
+	"time"
+)
+
+func (p *PolySyncManager) MonitorChain() {
+	if !p.init() {
+		log.Errorf("PolySyncManager MonitorChain - init error\n")
+		return
+	}
+
+	log.Infof("PolySyncManager MonitorChain - start scan block at height: %d\n", p.currentHeight)
+	monitorTicker := time.NewTicker(time.Duration(p.cfg.PolyConfig.PolyMonitorInterval) * time.Second)
+	var blockHandleResult bool
+	for {
+	start:
+		log.Infof("PolySyncManager MonitorChain - current height: %d\n", p.currentHeight)
+		select {
+		case <-monitorTicker.C:
+			latestHeight, err := p.polySdk.GetCurrentBlockHeight()
+			if err != nil {
+				log.Errorf("PolySyncManager MonitorChain - cannot get node hight, err: %s\n", err.Error())
+				continue
+			}
+			latestHeight--
+			if latestHeight-p.currentHeight < config.OntUsefulBlockNum {
+				log.Infof("PolySyncManager MonitorChain - poly chain skip current height: %d", latestHeight)
+				continue
+			}
+			log.Infof("PolySyncManager MonitorChain - poly chain current height: %d", latestHeight)
+			blockHandleResult = true
+			for p.currentHeight <= latestHeight-config.OntUsefulBlockNum {
+				blockHandleResult = p.handleDepositEvents(p.currentHeight, latestHeight)
+				if blockHandleResult {
+					p.currentHeight++
+					if err = p.db.UpdatePolyHeight(p.currentHeight - 1); err != nil {
+						log.Errorf("PolySyncManager MonitorChain - failed to save height of poly: %v", err)
+					}
+				} else {
+					goto start
+				}
+			}
+
+		case <-p.exitChan:
+			return
+
+		}
+	}
+}
+
+func (p *PolySyncManager) handleDepositEvents(height, latest uint32) bool {
+	log.Infof("PolySyncManager handleDepositEvents at height %d, latest height %d\n", height, latest)
+	lastEpoch := p.findLatestHeight()
+	hdr, err := p.polySdk.GetHeaderByHeight(height + 1)
+	if err != nil {
+		log.Errorf("PolySyncManager handleBlockHeader - GetNodeHeader on height :%d failed", height)
+		return false
+	}
+	isCurr := lastEpoch < height+1
+	info := &vconfig.VbftBlockInfo{}
+	if err := json.Unmarshal(hdr.ConsensusPayload, info); err != nil {
+		log.Errorf("PolySyncManager failed to unmarshal ConsensusPayload for height %d: %v", height+1, err)
+		return false
+	}
+	isEpoch := hdr.NextBookkeeper != common.ADDRESS_EMPTY && info.NewChainConfig != nil
+	var (
+		anchor *polytypes.Header
+		hp     string
+	)
+	if !isCurr {
+		anchor, _ = p.polySdk.GetHeaderByHeight(lastEpoch + 1)
+		proof, _ := p.polySdk.GetMerkleProof(height+1, lastEpoch+1)
+		hp = proof.AuditPath
+	} else if isEpoch {
+		anchor, _ = p.polySdk.GetHeaderByHeight(height + 2)
+		proof, _ := p.polySdk.GetMerkleProof(height+1, height+2)
+		hp = proof.AuditPath
+	}
+
+	cnt := 0
+	events, err := p.polySdk.GetSmartContractEventByBlock(height)
+	for err != nil {
+		log.Errorf("PolySyncManager handleDepositEvents - get block event at height:%d error: %s", height, err.Error())
+		return false
+	}
+	for _, event := range events {
+		for _, notify := range event.Notify {
+			log.Infof("PolySyncManager handleDepositEvents get notify address: %s\n", notify.ContractAddress)
+			if notify.ContractAddress == p.cfg.PolyConfig.EntranceContractAddress {
+				states := notify.States.([]interface{})
+				method, _ := states[0].(string)
+				if method != "makeProof" {
+					continue
+				}
+				if uint64(states[2].(float64)) != p.cfg.ZilConfig.SideChainId {
+					continue
+				}
+				proof, err := p.polySdk.GetCrossStatesProof(hdr.Height-1, states[5].(string))
+				if err != nil {
+					log.Errorf("handleDepositEvents - failed to get proof for key %s: %v", states[5].(string), err)
+					continue
+				}
+				auditpath, _ := hex.DecodeString(proof.AuditPath)
+				value, _, _, _ := tools.ParseAuditpath(auditpath)
+				param := &common2.ToMerkleValue{}
+				if err := param.Deserialization(common.NewZeroCopySource(value)); err != nil {
+					log.Errorf("handleDepositEvents - failed to deserialize MakeTxParam (value: %x, err: %v)", value, err)
+					continue
+				}
+				var isTarget bool
+				if len(p.cfg.TargetContracts) > 0 {
+					// target address configuration should include those contracts are allowed to be triggered by
+					// cross chain transactions. e.g LockProxy
+					toContractStr, _ := bech32.ToBech32Address(util.EncodeHex(param.MakeTxParam.ToContractAddress))
+					for _, v := range p.cfg.TargetContracts {
+						toChainIdArr, ok := v[toContractStr]
+						if ok {
+							if len(toChainIdArr["inbound"]) == 0 {
+								isTarget = true
+								break
+							}
+							for _, id := range toChainIdArr["inbound"] {
+								if id == param.FromChainID {
+									isTarget = true
+									break
+								}
+							}
+							if isTarget {
+								break
+							}
+						}
+					}
+					if !isTarget {
+						continue
+					}
+				}
+				cnt++
+				p.nonceManager.commitDepositEventsWithHeader(hdr, param, hp, anchor, event.TxHash, auditpath)
+			}
+		}
+	}
+
+	if cnt == 0 && isEpoch && isCurr {
+		return p.nonceManager.commitHeader(hdr)
+	}
+
+	return true
+}
+
+func (p *PolySyncManager) selectSender() *ZilSender {
+S:
+	log.Info("start select sender")
+	for _, sender := range p.senders {
+		sender.mu.Lock()
+		if !sender.inUse {
+			sender.inUse = true
+			sender.mu.Unlock()
+			log.Infof("sender %s selected", sender.address)
+			return sender
+		}
+		sender.mu.Unlock()
+	}
+	log.Warn("Current no zilliqa sender can use, sleep 10 seconds and reselect")
+	time.Sleep(time.Second * 10)
+	goto S
+}
+
+type EpochStartHeight struct {
+	CurEpochStartHeight string `json:"curEpochStartHeight"`
+}
+
+type EpochStartHeightRep struct {
+	Id      string           `json:"id"`
+	JsonRpc string           `json:"jsonrpc"`
+	Result  EpochStartHeight `json:"result"`
+}
+
+type FromChainTxExist struct {
+	FromChainTxExist map[string]interface{} `json:"fromChainTxExist"`
+}
+
+type FromChainTxExistRsp struct {
+	Id      string            `json:"id"`
+	JsonRpc string            `json:"jsonrpc"`
+	Result  *FromChainTxExist `json:"result"`
+}
+
+// ZilCrossChainManager.scilla
+// check fromChainTxExist map
+func (z *ZilSender) checkIfFromChainTxExist(fromChainId uint64, fromTx string) bool {
+	ccm, err := bech32.FromBech32Addr(z.cfg.ZilConfig.CrossChainManagerContract)
+	if err != nil {
+		log.Errorf("PolySyncManager checkIfFromChainTxExist -  failed to convert cross chain manager contract address: %s\n", err.Error())
+		return false
+	}
+
+	state, err1 := z.zilSdk.GetSmartContractSubState(ccm, "fromChainTxExist", []interface{}{strconv.FormatUint(fromChainId, 10), fromTx})
+	if err1 != nil {
+		log.Errorf("PolySyncManager checkIfFromChainTxExist - failed to get state of fromChainTxExist: %s\n", err1.Error())
+		return false
+	}
+
+	var fromChainTxExistRsp FromChainTxExistRsp
+	err2 := json.Unmarshal([]byte(state), &fromChainTxExistRsp)
+	if err2 != nil {
+		log.Errorf("PolySyncManager checkIfFromChainTxExist - failed to parse fromChainTxExistRsp: %s\n", err2.Error())
+		return false
+	}
+
+	if fromChainTxExistRsp.Result == nil {
+		return false
+	} else {
+		return true
+	}
+}
+
+// ZilCrossChainManager.scilla
+// curEpochStartHeight
+func (p *PolySyncManager) findLatestHeight() uint32 {
+	ccm, err := bech32.FromBech32Addr(p.cfg.ZilConfig.CrossChainManagerContract)
+	if err != nil {
+		log.Errorf("PolySyncManager FindLatestHeight -  failed to convert cross chain manager contract address: %s\n", err.Error())
+		return 0
+	}
+	curEpochStartHeight, err1 := p.zilSdk.GetSmartContractSubState(ccm, "curEpochStartHeight", []interface{}{})
+	if err1 != nil {
+		log.Errorf("PolySyncManager FindLatestHeight -  faild to get current epoch start height: %s\n", err1.Error())
+		return 0
+	}
+
+	var epochStartHeightRep EpochStartHeightRep
+	err3 := json.Unmarshal([]byte(curEpochStartHeight), &epochStartHeightRep)
+	if err3 != nil {
+		log.Errorf("PolySyncManager FindLatestHeight -  faild to unmarshal current epoch start height: %s\n", err3.Error())
+		return 0
+	}
+
+	height, err2 := strconv.ParseUint(epochStartHeightRep.Result.CurEpochStartHeight, 10, 32)
+	if err2 != nil {
+		log.Errorf("PolySyncManager FindLatestHeight -  failed to parse epoch start height: %s\n", err2.Error())
+		return 0
+	}
+	return uint32(height)
+}
diff --git a/service/poly2zil_test.go b/service/poly2zil_test.go
new file mode 100644
index 0000000..25f8ff0
--- /dev/null
+++ b/service/poly2zil_test.go
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"fmt"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	"github.com/magiconair/properties/assert"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"testing"
+)
+
+var p *PolySyncManager
+var s *ZilSender
+
+func init() {
+	zilSdk := provider.NewProvider("https://polynetworkcc3dcb2-5-api.dev.z7a.xyz")
+	p = &PolySyncManager{
+		zilSdk: zilSdk,
+		cfg: &config.Config{ZilConfig: &config.ZILConfig{
+			CrossChainManagerContract: "zil1ur4vwcmcz3jqypksgq7qeju2sk5jrskzaadau5",
+		}},
+	}
+	s = &ZilSender{
+		cfg: &config.Config{ZilConfig: &config.ZILConfig{
+			CrossChainManagerContract: "zil1ur4vwcmcz3jqypksgq7qeju2sk5jrskzaadau5",
+		}},
+		zilSdk:  zilSdk,
+		address: "zil1ur4vwcmcz3jqypksgq7qeju2sk5jrskzaadau5",
+	}
+}
+
+func TestPolySyncManager_FindLatestHeight(t *testing.T) {
+	fmt.Println(p.findLatestHeight())
+}
+
+func TestZilSender_CheckIfFromChainTxExist(t *testing.T) {
+	exist := s.checkIfFromChainTxExist(3, "0x00ca93f8738111a063d8ab7221f47c70a4cade0ca4a2829df494cd4b5e231bd6")
+	assert.Equal(t, exist, true)
+
+	exist = s.checkIfFromChainTxExist(3, "0x00ca93f8738111a063d8ab7221f47c70a4cade0ca4a2829df494cd4b5e231bd7")
+	assert.Equal(t, exist, false)
+
+}
diff --git a/service/polymanager.go b/service/polymanager.go
new file mode 100644
index 0000000..dd95463
--- /dev/null
+++ b/service/polymanager.go
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/Zilliqa/gozilliqa-sdk/account"
+	"github.com/Zilliqa/gozilliqa-sdk/crosschain/polynetwork"
+	"github.com/Zilliqa/gozilliqa-sdk/crypto"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	"github.com/ontio/ontology/common/log"
+	"github.com/polynetwork/poly-go-sdk"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/db"
+	"github.com/polynetwork/zilliqa-relayer/tools"
+	"strings"
+)
+
+type PolySyncManager struct {
+	currentHeight uint32
+	polySdk       *poly_go_sdk.PolySdk
+	exitChan      chan int
+	cfg           *config.Config
+	db            *db.BoltDB
+
+	zilSdk                 *provider.Provider
+	crossChainManager      string
+	crossChainManagerProxy string
+	senders                []*ZilSender
+	nonceManager           *NonceManager
+}
+
+func (p *PolySyncManager) init() bool {
+	if p.currentHeight > 0 {
+		log.Infof("PolySyncManager init - start height from flag: %d", p.currentHeight)
+		return true
+	}
+
+	p.currentHeight = p.db.GetPolyHeight()
+	log.Infof("PolySyncManager init - get poly height from local storage: %d", p.currentHeight)
+	latestHeight := p.findLatestHeight()
+	log.Infof("PolySyncManager init - get poly height from cross chain manager contract: %d", latestHeight)
+	if latestHeight > p.currentHeight {
+		p.currentHeight = latestHeight
+		return true
+	}
+	log.Infof("PolySyncManager init - start height from flag: %d", p.currentHeight)
+	return true
+}
+
+func (p *PolySyncManager) Run(enable bool) {
+	if enable {
+		go p.MonitorChain()
+		go p.nonceManager.Run()
+	}
+}
+
+func NewPolySyncManager(cfg *config.Config, zilSdk *provider.Provider, polySdk *poly_go_sdk.PolySdk, boltDB *db.BoltDB, crossChainManager, crossChainManagerProxy string) (*PolySyncManager, error) {
+	keystores, err := tools.ReadLine(cfg.ZilConfig.KeyStorePath)
+	keystorepwdset := cfg.ZilConfig.KeyStorePwdSet
+	if err != nil {
+		return nil, err
+	}
+	descryptor := crypto.NewDefaultKeystore()
+
+	var senders []*ZilSender
+	var privateKeys []string
+	zilSenderMap := make(map[string]*NonceAndSender, 0)
+
+	for _, keystore := range keystores {
+		var ks crypto.KeystoreV3
+		err1 := json.Unmarshal([]byte(keystore), &ks)
+		if err1 != nil {
+			return nil, err1
+		}
+		pwd := keystorepwdset[strings.ToLower(ks.Address)]
+		if pwd == nil {
+			return nil, errors.New("NewPolySyncManager - there is no password for zilliqa.wallet: " + ks.Address)
+		}
+		privateKey, err2 := descryptor.DecryptPrivateKey(keystore, pwd.(string))
+		if err2 != nil {
+			return nil, errors.New("NewPolySyncManager - descrypt zilliqa.wallet error: " + err2.Error())
+		}
+
+		// init cross chain smart contract proxy
+		wallet := account.NewWallet()
+		wallet.AddByPrivateKey(privateKey)
+		log.Infof("NewPolySyncManager get zilliqa wallet: %s", wallet.DefaultAccount.Address)
+		proxy := &polynetwork.Proxy{
+			ProxyAddr:  crossChainManagerProxy,
+			ImplAddr:   crossChainManager,
+			Wallet:     wallet,
+			Client:     zilSdk,
+			ChainId:    cfg.ZilConfig.ZilChainId,
+			MsgVersion: cfg.ZilConfig.ZilMessageVersion,
+		}
+
+		addr := strings.Replace(ks.Address, "0x", "", 1)
+		sender := &ZilSender{
+			cfg:             cfg,
+			zilSdk:          zilSdk,
+			address:         addr,
+			privateKey:      privateKey,
+			polySdk:         polySdk,
+			crossChainProxy: proxy,
+			inUse:           false,
+		}
+
+		senders = append(senders, sender)
+
+		balAndNonce, err3 := zilSdk.GetBalance(addr)
+		if err3 != nil {
+			log.Infof("NewPolySyncManager get address %s nonce error %s", addr, err3.Error())
+			continue
+		}
+
+		privateKeyAndNonce := &NonceAndSender{
+			Sender:     sender,
+			LocalNonce: balAndNonce.Nonce,
+		}
+
+		privateKeys = append(privateKeys, privateKey)
+		zilSenderMap[privateKey] = privateKeyAndNonce
+	}
+
+	nonceManager := &NonceManager{
+		UpdateInterval:        30,
+		ZilClient:             zilSdk,
+		SentTransactions:      make(map[string]map[string]TransactionWithAge),
+		ConfirmedTransactions: make(map[string][]string),
+		SenderPrivateKeys:     privateKeys,
+		ZilSenderMap:          zilSenderMap,
+		CurrentIndex:          0,
+		Cfg:                   cfg,
+	}
+
+	return &PolySyncManager{
+		currentHeight:          cfg.PolyConfig.PolyStartHeight,
+		polySdk:                polySdk,
+		exitChan:               make(chan int),
+		cfg:                    cfg,
+		db:                     boltDB,
+		zilSdk:                 zilSdk,
+		crossChainManager:      crossChainManager,
+		crossChainManagerProxy: crossChainManagerProxy,
+		senders:                senders,
+		nonceManager:           nonceManager,
+	}, nil
+}
diff --git a/service/zil2poly.go b/service/zil2poly.go
new file mode 100644
index 0000000..d617ecb
--- /dev/null
+++ b/service/zil2poly.go
@@ -0,0 +1,549 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"math/big"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/Zilliqa/gozilliqa-sdk/bech32"
+	"github.com/Zilliqa/gozilliqa-sdk/core"
+	"github.com/Zilliqa/gozilliqa-sdk/util"
+	"github.com/polynetwork/poly/common"
+	scom "github.com/polynetwork/poly/native/service/header_sync/common"
+	autils "github.com/polynetwork/poly/native/service/utils"
+	"github.com/polynetwork/zilliqa-relayer/tools"
+	log "github.com/sirupsen/logrus"
+)
+
+/**
+ * handle new block:
+ * 1. commit tx block and ds block
+ * 2. filter deposit event, put into local database
+ * 3. from database, handle deposit event, get proof and commit to poly
+ */
+
+func (s *ZilliqaSyncManager) MonitorChain() {
+	log.Infof("ZilliqaSyncManager MonitorChain - start scan block at height: %d\n", s.currentHeight)
+	fetchBlockTicker := time.NewTicker(time.Duration(s.cfg.ZilConfig.ZilMonitorInterval) * time.Second)
+	var blockHandleResult bool
+	for {
+		select {
+		case <-fetchBlockTicker.C:
+			txBlock, err := s.zilSdk.GetLatestTxBlock()
+			if err != nil {
+				log.Errorf("ZilliqaSyncManager MonitorChain - cannot get node hight, err: %s\n", err.Error())
+				continue
+			}
+			log.Infof("ZilliqaSyncManager MonitorChain - current tx block height: %s\n", txBlock.Header.BlockNum)
+			blockNumber, err2 := strconv.ParseUint(txBlock.Header.BlockNum, 10, 32)
+			if err2 != nil {
+				log.Errorf("ZilliqaSyncManager MonitorChain - cannot parse block height, err: %s\n", err2.Error())
+			}
+			if s.currentHeight >= blockNumber {
+				log.Infof("ZilliqaSyncManager MonitorChain - current height is not changed, skip")
+				continue
+			}
+
+			blockHandleResult = true
+			for s.currentHeight < blockNumber {
+				if s.debugInfo {
+					s.dumpPendingHeaders()
+				}
+				if !s.handleNewBlock(s.currentHeight + 1) {
+					break
+				}
+				s.currentHeight++
+
+				if uint32(len(s.header4sync)) > s.cfg.ZilConfig.ZilHeadersPerBatch {
+					log.Infof("ZilliqaSyncManager MonitorChain - commit header")
+					if s.debugInfo {
+						s.dumpPendingHeaders()
+					}
+					if res := s.commitHeader(); res != 0 {
+						log.Errorf("ZilliqaSyncManager MonitorChain -- commit header error, result %d", res)
+						blockHandleResult = false
+						break
+					}
+				}
+			}
+
+			if blockHandleResult && len(s.header4sync) > 0 {
+				s.commitHeader()
+			}
+
+		case <-s.exitChan:
+			return
+		}
+	}
+}
+
+func (s *ZilliqaSyncManager) handleNewBlock(height uint64) bool {
+	log.Infof("ZilliqaSyncManager handle new block: %d\n", height)
+	ret := s.handleBlockHeader(height)
+	if !ret {
+		log.Infof("ZilliqaSyncManager handleNewBlock - handleBlockHeader on height :%d failed\n", height)
+		return false
+	}
+	ret = s.fetchLockDepositEvents(height)
+	if !ret {
+		log.Infof("ZilliqaSyncManager handleNewBlock - fetchLockDepositEvents on height :%d failed\n", height)
+		return false
+	}
+	return true
+}
+
+func (s *ZilliqaSyncManager) handleBlockHeader(height uint64) bool {
+	log.Infof("ZilliqaSyncManager handle new block header height is: %d\n", height)
+T:
+	txBlockT, err := s.zilSdk.GetTxBlockVerbose(strconv.FormatUint(height, 10))
+	if err != nil {
+		log.Errorf("ZilliqaSyncManager - handleBlockHeader error: %s", err)
+		return false
+	}
+	txBlock := core.NewTxBlockFromTxBlockT(txBlockT)
+	if txBlock.BlockHeader.DSBlockNum == 18446744073709551615 {
+		log.Infof("ZilliqaSyncManager - handleBlockHeader query ds block: ds block not ready")
+		time.Sleep(time.Second * 2)
+		goto T
+	}
+	if txBlock.BlockHeader.DSBlockNum > s.currentDsBlockNum {
+		// as we can't control the order how the header4sync on the poly
+		// nodes after we sent it across,
+		// this will ensure that all the TXBlock for a given DSBlock are synced before
+		// we proceed with the next dsblock.
+		log.Infof("ZilliqaSyncManager - new DsBlock %d", txBlock.BlockHeader.DSBlockNum)
+		log.Infof("ZilliqaSyncManager - sync all the txblock for %d", s.currentDsBlockNum)
+		if res := s.commitHeader(); res != 0 {
+			log.Errorf("ZilliqaSyncManager MonitorChain -- commit header error, result %d", res)
+			return false
+		}
+
+		log.Infof("ZilliqaSyncManager - handleBlockHeader query ds block: %d\n", txBlock.BlockHeader.DSBlockNum)
+		dsBlock, err := s.zilSdk.GetDsBlockVerbose(strconv.FormatUint(txBlock.BlockHeader.DSBlockNum, 10))
+		if err != nil {
+			log.Errorf("ZilliqaSyncManager - handleBlockHeader get ds block error: %s", err)
+			return false
+		}
+		txBlockOrDsBlock := core.TxBlockOrDsBlock{
+			DsBlock: core.NewDsBlockFromDsBlockT(dsBlock),
+		}
+		rawBlock, _ := json.Marshal(txBlockOrDsBlock)
+		log.Infof("ZilliqaSyncManager handle new block header: %s\n", rawBlock)
+		s.header4sync = append(s.header4sync, rawBlock)
+		s.currentDsBlockNum++
+	}
+
+	txBlockOrDsBlock := core.TxBlockOrDsBlock{
+		TxBlock: txBlock,
+	}
+	rawBlock, err2 := json.Marshal(txBlockOrDsBlock)
+	if err2 != nil {
+		log.Errorf("ZilliqaSyncManager - handleBlockHeader marshal block error: %s", err2)
+		return false
+	}
+	log.Debugf("ZilliqaSyncManager handle new block header: %s\n", rawBlock)
+	blockHash := txBlock.BlockHash[:]
+	log.Infof("ZilliqaSyncManager handleBlockHeader - header hash: %s\n", util.EncodeHex(blockHash))
+	raw, _ := s.polySdk.GetStorage(autils.HeaderSyncContractAddress.ToHexString(),
+		append(append([]byte(scom.MAIN_CHAIN), autils.GetUint64Bytes(s.cfg.ZilConfig.SideChainId)...), autils.GetUint64Bytes(height)...))
+	if len(raw) == 0 || !bytes.Equal(raw, blockHash) {
+		s.header4sync = append(s.header4sync, rawBlock)
+	}
+	if s.debugInfo {
+		s.dumpPendingHeaders()
+	}
+	return true
+}
+
+// the workflow is: user -> LockProxy on zilliqa -> Cross Chain Manager -> emit event
+// so here we need to filter out those transactions related to cross chain manager
+// and parse the events, store them to local db, and commit them to the polynetwork
+func (s *ZilliqaSyncManager) fetchLockDepositEvents(height uint64) bool {
+	transactions, err := s.zilSdk.GetTxnBodiesForTxBlock(strconv.FormatUint(height, 10))
+	if err != nil {
+		if strings.Contains(err.Error(), "TxBlock has no transactions") {
+			log.Infof("ZilliqaSyncManager no transaction in block %d\n", height)
+			return true
+		} else {
+			log.Infof("ZilliqaSyncManager get transactions for tx block %d failed: %s\n", height, err.Error())
+			return false
+		}
+	}
+
+	for _, transaction := range transactions {
+		if !transaction.Receipt.Success {
+			continue
+		}
+		events := transaction.Receipt.EventLogs
+		for _, event := range events {
+			// 1. contract address should be cross chain manager
+			// 2. event name should be CrossChainEvent
+			toAddr, _ := bech32.ToBech32Address(event.Address)
+			if toAddr == s.crossChainManagerAddress {
+				if event.EventName != "CrossChainEvent" {
+					continue
+				}
+				log.Infof("ZilliqaSyncManager found event on cross chain manager: %+v\n", event)
+				// todo parse event to struct CrossTransfer
+				crossTx := &CrossTransfer{}
+				for _, param := range event.Params {
+					switch param.VName {
+					case "txId":
+						index := big.NewInt(0)
+						index.SetBytes(util.DecodeHex(param.Value.(string)))
+						crossTx.txIndex = tools.EncodeBigInt(index)
+					case "toChainId":
+						toChainId, _ := strconv.ParseUint(param.Value.(string), 10, 32)
+						crossTx.toChain = uint32(toChainId)
+					case "rawdata":
+						crossTx.value = util.DecodeHex(param.Value.(string))
+					}
+				}
+				crossTx.height = height
+				crossTx.txId = util.DecodeHex(transaction.ID)
+				log.Infof("ZilliqaSyncManager parsed cross tx is: %+v\n", crossTx)
+				sink := common.NewZeroCopySink(nil)
+				crossTx.Serialization(sink)
+				err1 := s.db.PutRetry(sink.Bytes())
+				if err1 != nil {
+					log.Errorf("ZilliqaSyncManager fetchLockDepositEvents - this.db.PutRetry error: %s", err)
+				}
+				log.Infof("ZilliqaSyncManager fetchLockDepositEvent -  height: %d", height)
+			} else {
+				log.Infof("ZilliqaSyncManager found event but not on cross chain manager, ignore: %+v\n", event)
+			}
+		}
+	}
+
+	return true
+}
+
+func (s *ZilliqaSyncManager) handleLockDepositEvents(height uint64) error {
+	if s.practiceOnly {
+		return nil
+	}
+	log.Infof("ZilliqaSyncManager handleLockDepositEvents - height is %d", height)
+	retryList, err := s.db.GetAllRetry()
+	if err != nil {
+		return fmt.Errorf("ZilliqaSyncManager - handleLockDepositEvents - this.db.GetAllRetry error: %s", err)
+	}
+	for _, v := range retryList {
+		time.Sleep(time.Second * 1)
+		crosstx := new(CrossTransfer)
+		err := crosstx.Deserialization(common.NewZeroCopySource(v))
+		if err != nil {
+			log.Errorf("ZilliqaSyncManager - handleLockDepositEvents - retry.Deserialization error: %s", err)
+			continue
+		}
+		heightString := new(string)
+		*heightString = strconv.FormatUint(height, 10)
+		ccmc, _ := bech32.FromBech32Addr(s.cfg.ZilConfig.CrossChainManagerContract)
+		ccmc = strings.ToLower(ccmc)
+		txIndexBigInt, _ := new(big.Int).SetString(crosstx.txIndex, 16)
+		txIndexDecimal := txIndexBigInt.String()
+		storageKey := core.GenerateStorageKey(ccmc, "zilToPolyTxHashMap", []string{txIndexDecimal})
+		hashedStorageKey := util.Sha256(storageKey)
+		log.Infof("ZilliqaSyncManager - handleLockDepositEvents start get proof on address %s, hashed key is: %s, height is %s", ccmc, util.EncodeHex(hashedStorageKey), *heightString)
+		proof, err := s.zilSdk.GetStateProof(ccmc, util.EncodeHex(hashedStorageKey), heightString)
+		if err != nil {
+			return fmt.Errorf("ZilliqaSyncManager - handleLockDepositEvents - get proof from api error: %s", err)
+		}
+
+		if proof == nil {
+			log.Warnf("ZilliqaSyncManager - handleLockDepositEvents - get proof from api error: %s", "proof is nil")
+			return fmt.Errorf("ZilliqaSyncManager - handleLockDepositEvents - get proof from api error: %s", "proof is nil")
+		}
+
+		log.Infof("ZilliqaSyncManager - handleLockDepositEvents get proof from zilliqa api endpoint:  %+v, height is: %d\n", proof, height)
+
+		zilProof := &ZILProof{
+			AccountProof: proof.AccountProof,
+		}
+
+		hexskey := util.EncodeHex(storageKey)
+		storageProof := StorageProof{
+			Key:   []byte(hexskey),
+			Value: crosstx.value,
+			Proof: proof.StateProof,
+		}
+
+		zilProof.StorageProofs = []StorageProof{storageProof}
+		proofRaw, _ := json.Marshal(zilProof)
+
+		// commit proof
+		proofString, _ := json.Marshal(proof)
+		log.Infof("ZilliqaSyncManager - handleLockDepositEvents commit proof, height: %d, proof: %s, value: %s, txhash: %s\n", height, proofString, util.EncodeHex(crosstx.value), util.EncodeHex(crosstx.txId))
+		tx, err := s.polySdk.Native.Ccm.ImportOuterTransfer(
+			s.cfg.ZilConfig.SideChainId,
+			crosstx.value,
+			uint32(height),
+			proofRaw,
+			util.DecodeHex(s.polySigner.Address.ToHexString()),
+			[]byte{},
+			s.polySigner)
+
+		if err != nil {
+			if strings.Contains(err.Error(), "ZilliqaSyncManager - handleLockDepositEvents chooseUtxos, current utxo is not enough") {
+				log.Infof("ZilliqaSyncManager - handleLockDepositEvents handleLockDepositEvents - invokeNativeContract error: %s", err)
+				continue
+			} else {
+				if err := s.db.DeleteRetry(v); err != nil {
+					log.Errorf("ZilliqaSyncManager - handleLockDepositEvents handleLockDepositEvents handleLockDepositEvents - this.db.DeleteRetry error: %s", err)
+				}
+				if strings.Contains(err.Error(), "tx already done") {
+					log.Debugf("ZilliqaSyncManager - handleLockDepositEvents handleLockDepositEvents handleLockDepositEvents - eth_tx %s already on poly", util.EncodeHex(crosstx.txId))
+				} else {
+					log.Errorf("ZilliqaSyncManager handleLockDepositEvents invokeNativeContract error for zil_tx %s: %s", util.EncodeHex(crosstx.txId), err)
+				}
+				continue
+			}
+		} else {
+			log.Infof("ZilliqaSyncManager - handleLockDepositEvents commitProof - send transaction to poly chain: ( poly_txhash: %s, zil_txhash: %s, height: %d )",
+				tx.ToHexString(), util.EncodeHex(crosstx.txId), height)
+			txHash := tx.ToHexString()
+			err = s.db.PutCheck(txHash, v)
+			err = s.db.PutCheck(txHash, v)
+			if err != nil {
+				log.Errorf("ZilliqaSyncManager handleLockDepositEvents - this.db.PutCheck error: %s", err)
+			}
+			err = s.db.DeleteRetry(v)
+			if err != nil {
+				log.Errorf("ZilliqaSyncManager handleLockDepositEvents - this.db.PutCheck error: %s", err)
+			}
+			log.Infof("ZilliqaSyncManager handleLockDepositEvents - syncProofToAlia txHash is %s", txHash)
+		}
+	}
+
+	return nil
+}
+
+// should be the same as relayer side
+type ZILProof struct {
+	AccountProof  []string       `json:"accountProof"`
+	StorageProofs []StorageProof `json:"storageProof"`
+}
+
+// key should be storage key (in zilliqa)
+type StorageProof struct {
+	Key   []byte   `json:"key"`
+	Value []byte   `json:"value"`
+	Proof []string `json:"proof"`
+}
+
+type CrossTransfer struct {
+	txIndex string
+	txId    []byte
+	value   []byte
+	toChain uint32
+	height  uint64
+}
+
+func (this *CrossTransfer) Serialization(sink *common.ZeroCopySink) {
+	sink.WriteString(this.txIndex)
+	sink.WriteVarBytes(this.txId)
+	sink.WriteVarBytes(this.value)
+	sink.WriteUint32(this.toChain)
+	sink.WriteUint64(this.height)
+}
+
+func (this *CrossTransfer) Deserialization(source *common.ZeroCopySource) error {
+	txIndex, eof := source.NextString()
+	if eof {
+		return fmt.Errorf("Waiting deserialize txIndex error")
+	}
+	txId, eof := source.NextVarBytes()
+	if eof {
+		return fmt.Errorf("Waiting deserialize txId error")
+	}
+	value, eof := source.NextVarBytes()
+	if eof {
+		return fmt.Errorf("Waiting deserialize value error")
+	}
+	toChain, eof := source.NextUint32()
+	if eof {
+		return fmt.Errorf("Waiting deserialize toChain error")
+	}
+	height, eof := source.NextUint64()
+	if eof {
+		return fmt.Errorf("Waiting deserialize height error")
+	}
+	this.txIndex = txIndex
+	this.txId = txId
+	this.value = value
+	this.toChain = toChain
+	this.height = height
+	return nil
+}
+
+func (s *ZilliqaSyncManager) dumpPendingHeaders() {
+	log.Infof("ZilliqaSyncManager pending headers ------**-*")
+	for _, raw := range s.header4sync {
+		var block core.TxBlockOrDsBlock
+		_ = json.Unmarshal(raw, &block)
+		if block.TxBlock != nil {
+			log.Infof("ZilliqaSyncManager txBlk %d", block.TxBlock.BlockHeader.BlockNum)
+		}
+		if block.DsBlock != nil {
+			log.Infof("ZilliqaSyncManager dsBlk %d", block.DsBlock.BlockHeader.BlockNum)
+		}
+	}
+	log.Infof("ZilliqaSyncManager pending headers ======**=*")
+}
+
+func (s *ZilliqaSyncManager) commitHeader() int {
+	// maybe delete this after it is stable
+	for _, raw := range s.header4sync {
+		var block core.TxBlockOrDsBlock
+		_ = json.Unmarshal(raw, &block)
+		if block.TxBlock != nil {
+			log.Infof("ZilliqaSyncManager commitHeader - about to commit tx block: %d from DS %d \n", block.TxBlock.BlockHeader.BlockNum,
+				block.TxBlock.BlockHeader.DSBlockNum)
+			if s.debugInfo {
+				log.Infof("000 Check if DS block is in storage")
+				s.checkDSBlockInStorage(block.TxBlock.BlockHeader.DSBlockNum)
+				log.Infof("Check header index")
+				s.getHeaderIndex(block.TxBlock.BlockHeader.BlockNum, block.TxBlock.BlockHash[:])
+				log.Infof("Check main chain")
+				s.getMainChain(block.TxBlock.BlockHeader.BlockNum)
+			}
+		}
+
+		if block.DsBlock != nil {
+			log.Infof("ZilliqaSyncManager commitHeader - about to commit ds block: %d\n", block.DsBlock.BlockHeader.BlockNum)
+			if s.debugInfo {
+				s.checkDSBlockInStorage(block.DsBlock.BlockHeader.BlockNum)
+				log.Infof("000 check ds block hash")
+				s.getDsBlockHeader(block.DsBlock.BlockHeader.BlockNum, block.DsBlock.BlockHash[:])
+			}
+		}
+	}
+
+	if s.practiceOnly {
+		log.Infof("ZilliqaSyncManager commitHeader - exit without sync")
+		return 1
+	}
+	tx, err := s.polySdk.Native.Hs.SyncBlockHeader(
+		s.cfg.ZilConfig.SideChainId,
+		s.polySigner.Address,
+		s.header4sync,
+		s.polySigner,
+	)
+
+	if err != nil {
+		errDesc := err.Error()
+		if strings.Contains(errDesc, "get the parent block failed") || strings.Contains(errDesc, "missing required field") {
+			log.Warnf("ZilliqaSyncManager commitHeader - send transaction to poly chain err: %s", errDesc)
+			s.rollBackToCommAncestor()
+			return 0
+		} else {
+			log.Errorf("ZilliqaSyncManager commitHeader - send transaction to poly chain err: %s", errDesc)
+			if s.debugInfo {
+				log.Info("ZilliqaSyncManager - Raw data ****** ")
+				for _, raw := range s.header4sync {
+					log.Infof(string(raw[:]))
+				}
+				log.Infof("ZilliqaSyncManager - Raw data ends ====== ")
+			}
+			return 1
+		}
+	}
+
+	tick := time.NewTicker(100 * time.Millisecond)
+	retries := 0
+	var h uint32
+	for range tick.C {
+		if retries > 5000 {
+			return 1
+		} else {
+			retries++
+		}
+		h, err = s.polySdk.GetBlockHeightByTxHash(tx.ToHexString())
+
+		if err != nil {
+			if strings.Contains(err.Error(), "JsonRpcResponse error code:42002 desc:INVALID PARAMS") {
+				log.Infof("ZilliqaSyncManager commitHeader - wait for confirmation")
+			} else {
+				log.Warnf("ZilliqaSyncManager commitHeader get block height by hash, hash: %s error: %s", tx.ToHexString(), err.Error())
+			}
+		}
+		curr, err2 := s.polySdk.GetCurrentBlockHeight()
+		if err2 != nil {
+			log.Warnf("ZilliqaSyncManager commitHeader get current block height error: %s", err2.Error())
+		}
+		if h > 0 && curr > h {
+			log.Infof("ZilliqaSyncManager commitHeader h > 0 or curr > h")
+			break
+		}
+	}
+
+	log.Infof("ZilliqaSyncManager commitHeader - send transaction %s to poly chain and confirmed on height %d", tx.ToHexString(), h)
+	s.header4sync = make([][]byte, 0)
+
+	s.handleLockDepositEvents(s.currentHeight)
+	return 0
+}
+
+func (s *ZilliqaSyncManager) rollBackToCommAncestor() {
+	for ; ; s.currentHeight-- {
+		raw, err := s.polySdk.GetStorage(autils.HeaderSyncContractAddress.ToHexString(),
+			append(append([]byte(scom.MAIN_CHAIN), autils.GetUint64Bytes(s.cfg.ZilConfig.SideChainId)...), autils.GetUint64Bytes(s.currentHeight)...))
+		if len(raw) == 0 || err != nil {
+			continue
+		}
+		txBlockT, err2 := s.zilSdk.GetTxBlockVerbose(strconv.FormatUint(s.currentHeight, 10))
+		if err2 != nil {
+			log.Errorf("rollBackToCommAncestor - failed to get header by number, so we wait for one second to retry: %v", err2)
+			time.Sleep(time.Second)
+			s.currentHeight++
+			continue
+		}
+		blockHeader := core.NewTxBlockFromTxBlockT(txBlockT).BlockHeader
+		if bytes.Equal(util.Sha256(blockHeader.Serialize()), raw) {
+			bs, _ := json.Marshal(blockHeader)
+			log.Infof("ZilliqaSyncManager rollBackToCommAncestor - find the common ancestor: %s(number: %d)", bs, s.currentHeight)
+			break
+		}
+	}
+
+	s.header4sync = make([][]byte, 0)
+	txBlock, err := s.zilSdk.GetTxBlock(strconv.FormatUint(s.currentHeight, 10))
+	if err != nil {
+		log.Warnf("rollBackToCommAncestor, fail to get tx block, err: %s\n", err)
+	}
+
+	dsNum, err2 := strconv.ParseUint(txBlock.Header.DSBlockNum, 10, 64)
+	if err2 != nil {
+		log.Warnf("rollBackToCommAncestor, fail to parse ds num, err: %s\n", err2)
+	}
+
+	a, _ := s.zilSdk.GetDsBlockVerbose(txBlock.Header.DSBlockNum)
+	b := core.NewDsBlockFromDsBlockT(a)
+	txBlockOrDsBlock := core.TxBlockOrDsBlock{
+		DsBlock: b,
+	}
+	rawBlock, _ := json.Marshal(txBlockOrDsBlock)
+	s.header4sync = append(s.header4sync, rawBlock)
+	s.currentDsBlockNum = dsNum
+
+}
diff --git a/service/zil_sender.go b/service/zil_sender.go
new file mode 100644
index 0000000..8caa5c6
--- /dev/null
+++ b/service/zil_sender.go
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"github.com/Zilliqa/gozilliqa-sdk/crosschain/polynetwork"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	"github.com/Zilliqa/gozilliqa-sdk/transaction"
+	"github.com/Zilliqa/gozilliqa-sdk/util"
+	"github.com/ontio/ontology-crypto/keypair"
+	"github.com/ontio/ontology-crypto/signature"
+	poly_go_sdk "github.com/polynetwork/poly-go-sdk"
+	vconfig "github.com/polynetwork/poly/consensus/vbft/config"
+	polytypes "github.com/polynetwork/poly/core/types"
+	common2 "github.com/polynetwork/poly/native/service/cross_chain_manager/common"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/tools"
+	log "github.com/sirupsen/logrus"
+	"sync"
+)
+
+type ZilSender struct {
+	cfg    *config.Config
+	zilSdk *provider.Provider
+	//non-bech32 address
+	address    string
+	privateKey string
+
+	polySdk         *poly_go_sdk.PolySdk
+	crossChainProxy *polynetwork.Proxy
+	inUse           bool
+	mu              sync.Mutex
+}
+
+func (sender *ZilSender) commitDepositEventsWithHeaderWithNonce(header *polytypes.Header, param *common2.ToMerkleValue, headerProof string, anchorHeader *polytypes.Header, polyTxHash string, rawAuditPath []byte, nonce string) (*transaction.Transaction, error) {
+	// verifyHeaderAndExecuteTx
+	var (
+		sigs       []byte
+		headerData []byte
+	)
+	if anchorHeader != nil && headerProof != "" {
+		for _, sig := range anchorHeader.SigData {
+			temp := make([]byte, len(sig))
+			copy(temp, sig)
+			newsig, _ := signature.ConvertToEthCompatible(temp)
+			sigs = append(sigs, newsig...)
+		}
+	} else {
+		for _, sig := range header.SigData {
+			temp := make([]byte, len(sig))
+			copy(temp, sig)
+			newsig, _ := signature.ConvertToEthCompatible(temp)
+			sigs = append(sigs, newsig...)
+		}
+	}
+
+	exist := sender.checkIfFromChainTxExist(param.FromChainID, util.EncodeHex(param.TxHash))
+	if exist {
+		log.Infof("ZilSender commitDepositEventsWithHeader - already relayed to zil: (from_chain_id: %d, from_txhash: %x, param.TxHash: %x\n)", param.FromChainID, param.TxHash, param.MakeTxParam.TxHash)
+		return nil, errors.New("ZilSender commitDepositEventsWithHeader - already relayed to zil")
+	}
+
+	var rawAnchor []byte
+	if anchorHeader != nil {
+		rawAnchor = anchorHeader.GetMessage()
+	}
+	headerData = header.GetMessage()
+
+	pe := polynetwork.DeserializeProof(util.EncodeHex(rawAuditPath), 0)
+	rawHeader := "0x" + util.EncodeHex(headerData)
+	hpe := polynetwork.DeserializeProof(headerProof, 0)
+	curRawHeader := "0x" + util.EncodeHex(rawAnchor)
+	signatures, _ := polynetwork.SplitSignature(util.EncodeHex(sigs))
+
+	return sender.crossChainProxy.VerifyHeaderAndExecuteTxWithNonce(pe, rawHeader, hpe, curRawHeader, signatures, nonce)
+}
+
+func (sender *ZilSender) commitDepositEventsWithHeader(header *polytypes.Header, param *common2.ToMerkleValue, headerProof string, anchorHeader *polytypes.Header, polyTxHash string, rawAuditPath []byte) bool {
+	// verifyHeaderAndExecuteTx
+	var (
+		sigs       []byte
+		headerData []byte
+	)
+	if anchorHeader != nil && headerProof != "" {
+		for _, sig := range anchorHeader.SigData {
+			temp := make([]byte, len(sig))
+			copy(temp, sig)
+			newsig, _ := signature.ConvertToEthCompatible(temp)
+			sigs = append(sigs, newsig...)
+		}
+	} else {
+		for _, sig := range header.SigData {
+			temp := make([]byte, len(sig))
+			copy(temp, sig)
+			newsig, _ := signature.ConvertToEthCompatible(temp)
+			sigs = append(sigs, newsig...)
+		}
+	}
+
+	exist := sender.checkIfFromChainTxExist(param.FromChainID, util.EncodeHex(param.TxHash))
+	if exist {
+		log.Infof("ZilSender commitDepositEventsWithHeader - already relayed to zil: (from_chain_id: %d, from_txhash: %x, param.TxHash: %x\n)", param.FromChainID, param.TxHash, param.MakeTxParam.TxHash)
+		return true
+	}
+
+	var rawAnchor []byte
+	if anchorHeader != nil {
+		rawAnchor = anchorHeader.GetMessage()
+	}
+	headerData = header.GetMessage()
+
+	pe := polynetwork.DeserializeProof(util.EncodeHex(rawAuditPath), 0)
+	rawHeader := "0x" + util.EncodeHex(headerData)
+	hpe := polynetwork.DeserializeProof(headerProof, 0)
+	curRawHeader := "0x" + util.EncodeHex(rawAnchor)
+	signatures, _ := polynetwork.SplitSignature(util.EncodeHex(sigs))
+
+	transaction, err := sender.crossChainProxy.VerifyHeaderAndExecuteTx(pe, rawHeader, hpe, curRawHeader, signatures)
+	sender.inUse = false
+	if err != nil {
+		log.Errorf("ZilSender commitDepositEventsWithHeader - failed to call VerifyHeaderAndExecuteTx: %s\n", err.Error())
+		return false
+	}
+
+	log.Infof("ZilSender commitDepositEventsWithHeader -  confirmed transaction: %s\n", transaction.ID)
+	return true
+
+}
+
+func (sender *ZilSender) commitHeader(hdr *polytypes.Header) bool {
+	log.Infof("ZilSender commitHeader - height: %d\n", hdr.Height)
+	headerdata := hdr.GetMessage()
+	var (
+		bookkeepers []keypair.PublicKey
+		sigs        []byte
+	)
+
+	for _, sig := range hdr.SigData {
+		temp := make([]byte, len(sig))
+		copy(temp, sig)
+		newsig, _ := signature.ConvertToEthCompatible(temp)
+		sigs = append(sigs, newsig...)
+	}
+
+	blkInfo := &vconfig.VbftBlockInfo{}
+	if err := json.Unmarshal(hdr.ConsensusPayload, blkInfo); err != nil {
+		log.Errorf("commitHeader - unmarshal blockInfo error: %s", err)
+		return false
+	}
+
+	for _, peer := range blkInfo.NewChainConfig.Peers {
+		keystr, _ := hex.DecodeString(peer.ID)
+		key, _ := keypair.DeserializePublicKey(keystr)
+		bookkeepers = append(bookkeepers, key)
+	}
+
+	bookkeepers = keypair.SortPublicKeys(bookkeepers)
+	publickeys := make([]byte, 0)
+	for _, key := range bookkeepers {
+		publickeys = append(publickeys, tools.GetNoCompresskey(key)...)
+	}
+
+	rawHeader := "0x" + util.EncodeHex(headerdata)
+	PubKeys, _ := polynetwork.SplitPubKeys(util.EncodeHex(publickeys))
+	signatures, _ := polynetwork.SplitSignature(util.EncodeHex(sigs))
+	transaction, err := sender.crossChainProxy.ChangeBookKeeper(rawHeader, PubKeys, signatures)
+	sender.inUse = false
+	if err != nil {
+		log.Errorf("ZilSender commitHeader - failed to call VerifyHeaderAndExecuteTx: %s\n", err.Error())
+		return false
+	}
+
+	log.Infof("ZilSender commitHeader -  confirmed transaction: %s\n", transaction.ID)
+
+	return true
+
+}
+
+func (sender *ZilSender) commitHeaderWithNonce(hdr *polytypes.Header, nonce string) (*transaction.Transaction, error) {
+	log.Infof("ZilSender commitHeader - height: %d\n", hdr.Height)
+	headerdata := hdr.GetMessage()
+	var (
+		bookkeepers []keypair.PublicKey
+		sigs        []byte
+	)
+
+	for _, sig := range hdr.SigData {
+		temp := make([]byte, len(sig))
+		copy(temp, sig)
+		newsig, _ := signature.ConvertToEthCompatible(temp)
+		sigs = append(sigs, newsig...)
+	}
+
+	blkInfo := &vconfig.VbftBlockInfo{}
+	if err := json.Unmarshal(hdr.ConsensusPayload, blkInfo); err != nil {
+		return nil, err
+	}
+
+	for _, peer := range blkInfo.NewChainConfig.Peers {
+		keystr, _ := hex.DecodeString(peer.ID)
+		key, _ := keypair.DeserializePublicKey(keystr)
+		bookkeepers = append(bookkeepers, key)
+	}
+
+	bookkeepers = keypair.SortPublicKeys(bookkeepers)
+	publickeys := make([]byte, 0)
+	for _, key := range bookkeepers {
+		publickeys = append(publickeys, tools.GetNoCompresskey(key)...)
+	}
+
+	rawHeader := "0x" + util.EncodeHex(headerdata)
+	PubKeys, _ := polynetwork.SplitPubKeys(util.EncodeHex(publickeys))
+	signatures, _ := polynetwork.SplitSignature(util.EncodeHex(sigs))
+	return sender.crossChainProxy.ChangeBookKeeperWithNonce(rawHeader, PubKeys, signatures, nonce)
+}
diff --git a/service/zilliqamanager.go b/service/zilliqamanager.go
new file mode 100644
index 0000000..354f1b6
--- /dev/null
+++ b/service/zilliqamanager.go
@@ -0,0 +1,295 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package service
+
+import (
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"github.com/Zilliqa/gozilliqa-sdk/account"
+	"github.com/Zilliqa/gozilliqa-sdk/core"
+	"github.com/Zilliqa/gozilliqa-sdk/provider"
+	poly "github.com/polynetwork/poly-go-sdk"
+	sdk "github.com/polynetwork/poly-go-sdk"
+	"github.com/polynetwork/poly/common"
+	scom "github.com/polynetwork/poly/native/service/header_sync/common"
+	autils "github.com/polynetwork/poly/native/service/utils"
+	"github.com/polynetwork/zilliqa-relayer/config"
+	"github.com/polynetwork/zilliqa-relayer/db"
+	log "github.com/sirupsen/logrus"
+	"strconv"
+)
+
+/**
+ * currentHeight's source is either from poly remote storage or forceHeight
+ */
+type ZilliqaSyncManager struct {
+	polySigner               *poly.Account
+	polySdk                  *poly.PolySdk
+	relaySyncHeight          uint32
+	zilAccount               *account.Account
+	currentHeight            uint64
+	currentDsBlockNum        uint64
+	forceHeight              uint64
+	zilSdk                   *provider.Provider
+	crossChainManagerAddress string
+	cfg                      *config.Config
+	db                       *db.BoltDB
+	exitChan                 chan int
+	header4sync              [][]byte
+	debugInfo                bool
+	practiceOnly             bool
+}
+
+func NewZilliqaSyncManager(cfg *config.Config, zilSdk *provider.Provider, polysdk *sdk.PolySdk, boltDB *db.BoltDB, debugInfo bool, practiceOnly bool) (*ZilliqaSyncManager, error) {
+	var wallet *sdk.Wallet
+	var err error
+	if !common.FileExisted(cfg.PolyConfig.PolyWalletFile) {
+		wallet, err = polysdk.OpenWallet(cfg.PolyConfig.PolyWalletFile)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		wallet, err = polysdk.OpenWallet(cfg.PolyConfig.PolyWalletFile)
+		if err != nil {
+			log.Errorf("NewZilliqaSyncManager - wallet open error: %s", err.Error())
+			return nil, err
+		}
+	}
+	signer, err := wallet.GetDefaultAccount([]byte(cfg.PolyConfig.PolyWalletPassword))
+	if err != nil || signer == nil {
+		signer, err = wallet.NewDefaultSettingAccount([]byte(cfg.PolyConfig.PolyWalletPassword))
+		if err != nil {
+			log.Errorf("NewETHManager - wallet password error")
+			return nil, err
+		}
+
+		err = wallet.Save()
+		if err != nil {
+			return nil, err
+		}
+	}
+	log.Infof("NewZilliqaSyncManager - poly address: %s", signer.Address.ToBase58())
+	zilliqaSyncManager := &ZilliqaSyncManager{
+		db:                       boltDB,
+		cfg:                      cfg,
+		exitChan:                 make(chan int),
+		zilSdk:                   zilSdk,
+		forceHeight:              cfg.ZilConfig.ZilForceHeight,
+		crossChainManagerAddress: cfg.ZilConfig.CrossChainManagerContract,
+		polySigner:               signer,
+		polySdk:                  polysdk,
+		debugInfo:                debugInfo,
+		practiceOnly:             practiceOnly,
+	}
+
+	err = zilliqaSyncManager.init()
+	if err != nil {
+		return nil, err
+	} else {
+		return zilliqaSyncManager, nil
+	}
+}
+
+func (s *ZilliqaSyncManager) Run(enable bool) {
+	if enable {
+		go s.MonitorChain()
+	}
+}
+
+func (s *ZilliqaSyncManager) init() error {
+	// get latest tx block from remote poly storage, thus we can know current tx block num and ds block num
+	latestHeight := s.findLatestTxBlockHeight()
+	log.Infof("ZilliqaSyncManager init - get latest tx block from poly, tx block height is: %d\n", latestHeight)
+
+	if latestHeight == 0 {
+		return fmt.Errorf("ZilliqaSyncManager init - the genesis block has not synced!")
+	}
+
+	if s.forceHeight > 0 && s.forceHeight < latestHeight {
+		s.currentHeight = s.forceHeight
+	} else {
+		s.currentHeight = latestHeight
+	}
+	log.Infof("ZilliqaSyncManager init - start height: %d", s.currentHeight)
+	if s.debugInfo {
+		s.getGenesisHeader()
+		s.getMainChain(latestHeight)
+	}
+	txBlockT, err := s.zilSdk.GetTxBlockVerbose(strconv.FormatUint(s.currentHeight, 10))
+	if err != nil {
+		return fmt.Errorf("ZilliqaSyncManager init - get tx block error: %s", err.Error())
+	}
+	dsBlockNum, _ := strconv.ParseUint(txBlockT.Header.DSBlockNum, 10, 64)
+	s.currentDsBlockNum = dsBlockNum
+	log.Infof("ZilliqaSyncManager init - current ds block height is: %d\n", s.currentDsBlockNum)
+	return nil
+}
+
+func (s *ZilliqaSyncManager) getGenesisHeader() {
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	key := append([]byte(scom.GENESIS_HEADER), sideChainIdBytes[:]...)
+	contractAddress := autils.HeaderSyncContractAddress
+	result, err := s.polySdk.GetStorage(contractAddress.ToHexString(), key)
+	if err != nil {
+		log.Infof("cannot obtain latest genesis header\n")
+	}
+	if result == nil || len(result) == 0 {
+		log.Infof("0-length result from gensis header query\n")
+	}
+	// Turns out the genesis header is a string.
+	block := new(core.TxBlock)
+	genesisString := string(result[:])
+	log.Infof("----- GENESIS HEADER ----- \n")
+	log.Infof("%s", genesisString)
+	log.Infof("====== END GENESIS HEADER ===== \n")
+	err = json.Unmarshal(result, block)
+	if err != nil {
+		log.Infof("!!!!! Could not unmarshal genesis - %s", err)
+	} else {
+		log.Infof("Get main chain for %d", block.BlockHeader.BlockNum)
+		s.getMainChain(block.BlockHeader.BlockNum)
+		log.Infof("GetHeaderIndex for %d:%x", block.BlockHeader.BlockNum, block.BlockHash)
+		s.getHeaderIndex(block.BlockHeader.BlockNum, block.BlockHash[:])
+		dsBlockNum := block.BlockHeader.DSBlockNum
+		log.Infof("Get DsComm %d from polynet", dsBlockNum)
+		s.checkDSBlockInStorage(dsBlockNum)
+		log.Infof("Get DS Block %d from chain", dsBlockNum)
+		dsb, err := s.zilSdk.GetDsBlockVerbose(strconv.FormatUint(dsBlockNum, 10))
+		if err != nil {
+			log.Infof("Could not get DS Block - %s", err)
+		} else {
+			if dsb == nil {
+				log.Infof("nil DS Block %s", strconv.Itoa(int(dsBlockNum)))
+			} else {
+				dsbval := core.NewDsBlockFromDsBlockT(dsb)
+				log.Infof("getDsBlockHeader %x", dsbval.BlockHash)
+				s.getDsBlockHeader(dsBlockNum, dsbval.BlockHash[:])
+			}
+		}
+		log.Infof("XXX Done")
+		s.scanForDsCommittees(dsBlockNum)
+	}
+}
+
+func (s *ZilliqaSyncManager) scanForDsCommittees(seedBlk uint64) {
+	for i := -32; i < 32; i += 1 {
+		toSearch := int(seedBlk) + i
+		log.Infof("==== Is there a DSC for %d? ", toSearch)
+		s.checkDSBlockInStorage(uint64(toSearch))
+		log.Infof("---- NEXT DSC")
+	}
+}
+
+// Get the DS Block Header
+func (s *ZilliqaSyncManager) getDsBlockHeader(dsBlkNum uint64, hash []byte) {
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	key := append([]byte(scom.HEADER_INDEX), sideChainIdBytes[:]...)
+	key = append(key, hash...)
+	contractAddress := autils.HeaderSyncContractAddress
+	result, err := s.polySdk.GetStorage(contractAddress.ToHexString(), key)
+	log.Infof("---- DS Header hash with blknum %d hash %x", dsBlkNum, hash)
+	if err != nil {
+		log.Infof("==== FAILED %s", err)
+	}
+	if result == nil || len(result) == 0 {
+		log.Infof("==== 0-length or empty result")
+	} else {
+		log.Infof("==== Retrieved: %x", result)
+	}
+
+}
+
+// Given a tx block number, try to obtain MAIN_CHAIN
+func (s *ZilliqaSyncManager) getMainChain(blknum uint64) {
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	key := append([]byte(scom.MAIN_CHAIN), sideChainIdBytes[:]...)
+	var blkNumBytes [8]byte
+	binary.LittleEndian.PutUint64(blkNumBytes[:], blknum)
+	key = append(key, blkNumBytes[:]...)
+	contractAddress := autils.HeaderSyncContractAddress
+	result, err := s.polySdk.GetStorage(contractAddress.ToHexString(), key)
+	log.Infof("---- MAIN_CHAIN with blknum %d", blknum)
+	if err != nil {
+		log.Infof("==== FAILED %s", err)
+	}
+	if result == nil || len(result) == 0 {
+		log.Infof("==== 0-length or empty result")
+	} else {
+		log.Infof("==== Retrieved: %x", result)
+	}
+}
+
+// Given a tx block hash, see if the header index is in storage.
+func (s *ZilliqaSyncManager) getHeaderIndex(blknum uint64, hash []byte) {
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	key := append([]byte(scom.HEADER_INDEX), sideChainIdBytes[:]...)
+	key = append(key, hash...)
+	contractAddress := autils.HeaderSyncContractAddress
+	result, err := s.polySdk.GetStorage(contractAddress.ToHexString(), key)
+	log.Infof("---- Header hash with blknum %d hash %x", blknum, hash)
+	if err != nil {
+		log.Infof("==== FAILED %s", err)
+	}
+	if result == nil || len(result) == 0 {
+		log.Infof("==== 0-length or empty result")
+	} else {
+		log.Infof("==== Retrieved: %x", result)
+	}
+}
+
+func (s *ZilliqaSyncManager) checkDSBlockInStorage(blk uint64) {
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	var blkc [8]byte
+	binary.LittleEndian.PutUint64(blkc[:], blk)
+	key := append(sideChainIdBytes[:], []byte("dsComm")...)
+	key = append(key, blkc[:]...)
+	result, err := s.polySdk.GetStorage(autils.HeaderSyncContractAddress.ToHexString(), key)
+	if err != nil {
+		log.Infof("XXXX Couldn't retrieve polynet storage for DS Block %d: %s", blk, err.Error())
+	}
+	if result == nil || len(result) == 0 {
+		log.Infof("XXXX no DSC stored for ds block %d", blk)
+	} else {
+		log.Infof("==== DSC for DS block %d is %x", blk, result)
+	}
+}
+
+func (s *ZilliqaSyncManager) findLatestTxBlockHeight() uint64 {
+	// try to get key
+	var sideChainIdBytes [8]byte
+	binary.LittleEndian.PutUint64(sideChainIdBytes[:], s.cfg.ZilConfig.SideChainId)
+	contractAddress := autils.HeaderSyncContractAddress
+	key := append([]byte(scom.CURRENT_HEADER_HEIGHT), sideChainIdBytes[:]...)
+	// try to get storage
+	result, err := s.polySdk.GetStorage(contractAddress.ToHexString(), key)
+	if err != nil {
+		log.Infof("get latest tx block from poly failed,err: %s\n", err.Error())
+		return 0
+	}
+	if result == nil || len(result) == 0 {
+		return 0
+	} else {
+		return binary.LittleEndian.Uint64(result)
+	}
+}
diff --git a/target_contracts.json b/target_contracts.json
new file mode 100644
index 0000000..f755f41
--- /dev/null
+++ b/target_contracts.json
@@ -0,0 +1,8 @@
+[
+  {
+    "zil1v4v858qjqd5s88vvsj3qsn89nndeldkpwd9l2c": {
+      "inbound": [202],
+      "outbound": [202]
+    }
+  }
+]
\ No newline at end of file
diff --git a/tools/utils.go b/tools/utils.go
new file mode 100644
index 0000000..5313566
--- /dev/null
+++ b/tools/utils.go
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2021 Zilliqa
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package tools
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/elliptic"
+	"encoding/hex"
+	"github.com/btcsuite/btcd/btcec"
+	"github.com/ontio/ontology-crypto/ec"
+	"github.com/ontio/ontology-crypto/keypair"
+	"github.com/ontio/ontology-crypto/sm2"
+	"github.com/polynetwork/poly/common"
+	"golang.org/x/crypto/ed25519"
+	"math/big"
+	"os"
+	"strings"
+)
+
+func EncodeBigInt(b *big.Int) string {
+	if b.Uint64() == 0 {
+		return "00"
+	}
+	return hex.EncodeToString(b.Bytes())
+}
+
+func ParseAuditpath(path []byte) ([]byte, []byte, [][32]byte, error) {
+	source := common.NewZeroCopySource(path)
+	/*
+		l, eof := source.NextUint64()
+		if eof {
+			return nil, nil, nil, nil
+		}
+	*/
+	value, eof := source.NextVarBytes()
+	if eof {
+		return nil, nil, nil, nil
+	}
+	size := int((source.Size() - source.Pos()) / common.UINT256_SIZE)
+	pos := make([]byte, 0)
+	hashs := make([][32]byte, 0)
+	for i := 0; i < size; i++ {
+		f, eof := source.NextByte()
+		if eof {
+			return nil, nil, nil, nil
+		}
+		pos = append(pos, f)
+
+		v, eof := source.NextHash()
+		if eof {
+			return nil, nil, nil, nil
+		}
+		var onehash [32]byte
+		copy(onehash[:], (v.ToArray())[0:32])
+		hashs = append(hashs, onehash)
+	}
+
+	return value, pos, hashs, nil
+}
+
+func ReadLine(path string) ([]string, error) {
+	var lines []string
+	file, err := os.Open(path)
+	if err != nil {
+		return lines, err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	if err1 := scanner.Err(); err1 != nil {
+		return lines, err1
+	}
+
+	return lines, nil
+}
+
+func GetCurveLabel(name string) (byte, error) {
+	switch strings.ToUpper(name) {
+	case strings.ToUpper(elliptic.P224().Params().Name):
+		return 1, nil
+	case strings.ToUpper(elliptic.P256().Params().Name):
+		return 2, nil
+	case strings.ToUpper(elliptic.P384().Params().Name):
+		return 3, nil
+	case strings.ToUpper(elliptic.P521().Params().Name):
+		return 4, nil
+	case strings.ToUpper(sm2.SM2P256V1().Params().Name):
+		return 20, nil
+	case strings.ToUpper(btcec.S256().Name):
+		return 5, nil
+	default:
+		panic("err")
+	}
+}
+
+func GetNoCompresskey(key keypair.PublicKey) []byte {
+	var buf bytes.Buffer
+	switch t := key.(type) {
+	case *ec.PublicKey:
+		switch t.Algorithm {
+		case ec.ECDSA:
+			// Take P-256 as a special case
+			if t.Params().Name == elliptic.P256().Params().Name {
+				return ec.EncodePublicKey(t.PublicKey, false)
+			}
+			buf.WriteByte(byte(0x12))
+		case ec.SM2:
+			buf.WriteByte(byte(0x13))
+		}
+		label, err := GetCurveLabel(t.Curve.Params().Name)
+		if err != nil {
+			panic(err)
+		}
+		buf.WriteByte(label)
+		buf.Write(ec.EncodePublicKey(t.PublicKey, false))
+	case ed25519.PublicKey:
+		panic("err")
+	default:
+		panic("err")
+	}
+	return buf.Bytes()
+}
+
+func AppendToFile(fileName string, context string) {
+	f, err := os.OpenFile(fileName, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
+	if err != nil {
+		panic(err)
+	}
+
+	defer f.Close()
+
+	if _, err = f.WriteString(context); err != nil {
+		panic(err)
+	}
+}