Conversion using a Ledger hardware wallet

In this section we will go over the steps of converting BTC to RBTC using Ledger hardware wallet, and vice versa on the Bitcoin and RSK networks.

• General requirements
• BTC to RBTC conversion
• RBTC to BTC conversion

General Requirements

• You need a Ledger with Bitcoin and Rootstock(RSK) Apps installed. We recommend you to have Ledger Live and review this tutorial:
• You need to have Electrum. Install it and configure it to be used with Ledger.
• Node >= 10.16.0

BTC to RBTC conversion

Instructions on how to do a Mainnet peg-in.

1 Get a BTC address with balance

We recommend to use Electrum BTC wallet for connecting to BTC Mainnet using Ledger hardware wallet.

• Download the wallet from Electrum Website
• Install Electrum
• Connect and unlock your Ledger device.
• Open the Bitcoin app
• Start Electrum
• Once Electrum starts, create or import a wallet
• At the keystore screen, select Use a hardware device and click Next.
• Select your Ledger device and click next.
• Choose the right derivation path for your account and click Next:
  • Legacy for an account that has addresses starting with a 1
• Go to the third tab "Receive". You will see a Bitcoin address.

Note: Check out this article configure it to be used with Ledger

Note: The Bitcoin wallet needs to be legacy (not Segwit) whose public key starts with either m or n, and private key starting with p2pkh:

2 Find a BTC address with balance

You will need to find the corresponding BTC address derived from the BTC derivation path in Electrum "Receive" tab.

• Check the derivation path for BTC to be used:
  • Mainnet: 44'/0'/0'/0/0 BIP 44 Legacy
• Unlock Ledger and open the Bitcoin App
• To get the BTC address derived from the derivation path that you have specified. Run the following script:

  const Transport = require("@ledgerhq/hw-transport-node-hid").default;
  const AppBtc = require("@ledgerhq/hw-app-btc").default;
  
  const getBtcAddress = async (derivationPath = "44'/0'/0'/0/0") => {
    try{
        const transport = await Transport.create();
        const btc = new AppBtc(transport);
        const result = await btc.getWalletPublicKey(derivationPath);
  
        console.log('BTC Address');
        console.log(result.bitcoinAddress);
        console.log('Derivation Path: ' + derivationPath);
    }
    catch(err){
      console.log(err);
    }
  };
  
  (async () => {
    await getBtcAddress("44'/0'/0'/0/0");
  })();

• After that you should get a result similar to:

  BTC Address
  12dAR91ji1xqimzdTQYHDtY....ppSR
  Derivation Path: 44'/0'/0'/0/0

This is the address that you have to use in order to do the transfer to the federation.

3 Send Bitcoin to RSK Federation address

To get the RSK Federation address you can run the following script:

const Web3 = require('web3');
const precompiled = require('@rsksmart/rsk-precompiled-abis');

const getFederationAddress = async function(){
    const bridge = precompiled.bridge.build(new Web3('https://public-node.rsk.co'));
    const address = await bridge.methods.getFederationAddress().call();
    console.log('Federation Address:');
    console.log(address);
}

(async () => {
    await getFederationAddress();
})();

Once you have the RSK Federation address, you can send Bitcoin to it from your Bitcoin address.

Use Electrum to send BTCs to the RSK Federation Address. To do that:

• Open Electrum
• Go to Addresses Tab
• Right click over it
• Select the option "Spend From":
• Finally make a payment to the RSK Federation Address

4 Wait for BTC confirmations

To ensure the transaction, we need to wait 100 BTC confirmations, be patient :)

100 blocks * 10 minutes/block = 1000 minutes = 16.667 hours approx.

5 Get RBTC address from Ledger harware wallet

Get the corresponding RBTC address from your Ledger harware wallet, following these steps:

• Connect and unlock your Ledger device.
• Open the RSK app.
• Get RSK derived address running this scripts:

    const Transport = require("@ledgerhq/hw-transport-node-hid").default;
    const AppEth = require("@ledgerhq/hw-app-eth").default;
  
    const getRskAddress = async (derivationPath = "44'/0'/0'/0/0") => {
      try{
          const transport = await Transport.create();
          const eth = new AppEth(transport);
          const result = await eth.getAddress(derivationPath);
  
          console.log('RSK Address');
          console.log(result.address);
          console.log('Derivation Path: ' + derivationPath);
      }
      catch(err){
          console.log(err);
      }
    };
  
    (async () => {
      await getRskAddress("44'/0'/0'/0/0");
    })();
  

• Go to MyCrypto and connect to Ledger harware wallet.
• Select Custom Address and put the derivation path m/44'/0'/0'/0. Then choose the address that you got from the previous step.

6 Check RBTC balance

You can check balance of RBTC address on MyCrypto or MEW setting the corresponding derivation path and selection the address.

Note: You have to wait a minimum of 100 confirmations + a minimum of 5 minutes for checking your RBTC balance

RBTC to BTC conversion

Instructions on how to do a Mainnet peg-out.

1 Get BTC address with Ledger hardware wallet

If you forgot your BTC public address, you can check section 1. The important thing is that the receiving is BTC address will be the same that it was used to send to the federation.

2 Send RBTC to RSK Bridge Contract

Open MyCrypto or MEW. Set the corresponding derivation path and selection the address.
This address has to be the same as that from section 6. Then do a transaction to the Bridge Contract.

Bridge Contract address: 0x0000000000000000000000000000000001000006

Note: The minimum amount to send in a peg-out transaction must be greater than or equals to 0.004 RBTC for Mainnet and the minimum amount to send in a peg-in transaction must be greater than or equals to 0.005 BTC for Mainnet Gas Limit of the transaction needs to be manually set at 100,000 gas; otherwise the transaction will fail. Gas Price can be set to 0.06 gwei.

3 Check balance of BTC address

You can either use Electrum wallet downloaded earlier or any Bitcoin explorer to check the balance.

Note: The release process on Bitcoin network takes 4000 RSK block confirmations and at least 10 more minutes.