unshield_prv.md

Description
Tutorial on how to withdraw PRV to EVM networks

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.

Withdraw PRV to EVM networks

By the end of September 2021, Incognito allows users to withdraw their PRV to the Ethereum/Binance Smart Chain networks. This is enabled by the implementations of two pegged-PRV tokens (ERC20 / BEP20). The withdrawing procedure is pretty much the same as that of an EVM token:

• The first step is to burn the PRV inside the Incognito network. This is done using the function CreateAndSendBurningPRVPeggingRequestTransaction. This step also needs to specify which network will the PRV be withdrawn to (using param isBSC, defaults to false).
• The second step is to retrieve the burn proof from the beacon chain. This is done via the function GetBurnPRVPeggingProof.
• Finally, we submit the burn proof to the designated pegged-PRV smart contract.

Example

unshield_prv.go

package main

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

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

	privateKey := "112t8rneWAhErTC8YUFTnfcKHvB1x6uAVdehy1S8GP2psgqDxK3RHouUcd69fz88oAL9XuMyQ8mBY5FmmGJdcyrpwXjWBXRpoWwgJXjsxi4j"
	remoteAddr := "b446151522b8f1c9d27cacedce93f398a016f84337c1b79fc54c8436af5f7900"
	burnedAmount := uint64(50000000)
	isBSC := false

	// burn PRV
	txHash, err := ic.CreateAndSendBurningPRVPeggingRequestTransaction(privateKey, remoteAddr, burnedAmount, isBSC)
	if err != nil {
		log.Fatal(err)
	}

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

	// wait for the above tx to reach the beacon chain
	time.Sleep(50 * time.Second)

	// retrieve the burn proof
	prvBurnProof, err := ic.GetBurnPRVPeggingProof(txHash, isBSC)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(prvBurnProof)
}

The final step is out of the scope of this tutorial series.

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