shield.md

Description
Tutorial on how to create an EVM-shielding transaction

Before Going Further

Please read through the tutorials on key submission and UTXO cache for proper balance and UTXO retrieval. Skip these parts if you're familiar with these notions.

Depositing EVM/EVM20 to Incognito

Suppose that we already have a transaction that deposited some EVM/EVM20 to the smart contract. To mint the same amount of pEVM/pEVM20 inside the Incognito network, we use the function CreateAndSendIssuingEVMRequestTransaction with the following inputs:

• privateKey: our private key to sign the transaction.
• tokenID: the pEVM/pEVM20 tokenID.
• depositProof: the EVM receipt for the depositing transaction.
• evmNetworkID: the ID of the target EVM network, defaults to rpc.ETHNetworkID.

Example

shield.go

package main

import (
	"fmt"
	"github.com/incognitochain/go-incognito-sdk-v2/incclient"
	"github.com/incognitochain/go-incognito-sdk-v2/rpchandler/rpc"
	"log"
	"time"
)

func main() {
	ic, err := incclient.NewTestNet1Client()
	if err != nil {
		log.Fatal(err)
	}

	privateKey := "112t8rneWAhErTC8YUFTnfcKHvB1x6uAVdehy1S8GP2psgqDxK3RHouUcd69fz88oAL9XuMyQ8mBY5FmmGJdcyrpwXjWBXRpoWwgJXjsxi4j"
	tokenIDStr := "ffd8d42dc40a8d166ea4848baf8b5f6e9fe0e9c30d60062eb7d44a8df9e00854"
	evmTxHash := "0xb31d963b3f183d60532ca60d534e0113ca56070af795fde450dd456945a7be42"

	// specify which EVM network we are interacting with. evmNetworkID could be one of the following:
	// 	- rpc.ETHNetworkID
	//	- rpc.BSCNetworkID
	//	- rpc.PLGNetworkID
	evmNetworkID := rpc.ETHNetworkID

	evmProof, depositAmount, err := ic.GetEVMDepositProof(evmTxHash, evmNetworkID)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Deposited amount: %v\n", depositAmount)

	txHashStr, err := ic.CreateAndSendIssuingEVMRequestTransaction(privateKey, tokenIDStr, *evmProof, evmNetworkID)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("TxHash: %v\n", txHashStr)

	time.Sleep(10 * time.Second)

	fmt.Printf("check shielding status\n")
	for {
		status, err := ic.CheckShieldStatus(txHashStr)
		if err != nil {
			log.Fatal(err)
		}
		if status == 1 || status == 0 {
			time.Sleep(5 * time.Second)
			continue
		}
		fmt.Printf("shielding status: %v\n", status)
		break
	}
}

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