Create a wallet

Overview

This guide describes how to create a blockchain wallet using the MPC (Multi-Party Computation) SDK.

This process involves generating a client-side private key shard, encrypting it with a passphrase, and backing up the encrypted shard. The user's wallet address is then retrieved for use in transactions.

Prerequisites

Complete the steps in Get started.

Steps

Step 1. Get the user's access token

Get the user's access token after authenticating the user with Mavis Account or Mavis ID.

Step 2. Collect a passphrase

A passphrase is a crucial part of the wallet creation process. It's used to encrypt the user's private key shard. The passphrase is used to decrypt the private key shard during wallet recovery.

The passphrase must meet the following requirements:

• Contain at least 8 characters
• Include at least one number
• Include at least one special character

Step 3. Create a wallet

Web

1. Create a client-side private key shard:

Function signature:

async lockbox.genMpc() : KeygenResult ;

Result:

{
  key: string;
  meta: {
    requestId: string;
    uuid: string;
  }
}

Example:

const result = await lockbox.genMpc();
console.log("Client's key shard : ", result.key);
//...

2. Encrypt the client key shard with the passphrase:

Function signature:

encryptClientShard = async (passphrase: string, recoveryPhraseLength?: number)

Parameters:

Name	Type	Required	Description
passphrase	String	Required	The user's passphrase for encrypting the client shard.
recoveryPhraseLength	Number	Optional	The number of words in the recovery kit used to decrypt the client shard. Default is 8 words.

Result:

Name	Type	Description
encryptedKey	String	The client shard encrypted with the passphrase.
recoveryPhrase	String	A set of words used to decrypt the encrypted client shard if the user loses their passphrase.

caution

The user must remember their passphrase and recovery kit. If the user loses the passphrase and recovery kit, they lose access to their wallet, and neither Sky Mavis nor you as a developer can recover it.

Example:

const passphrase: string = `${YOUR_PASSPHRASE}`;
const recoveryPhraseLength: number = 8; // Default

// Return encrypted client shard
const result = await lockbox.encryptClientShard(
  passphrase,
  recoveryPhraseLength
);
//..

1. Back up the client shard:

Function signature:

backupClientShard = async (encryptedClientShard: string)

Parameters:

Name	Type	Required	Description
encryptedClientShard	String	Required	The encrypted client shard.

Result:

Name	Type	Description
encryptedKey	String	The client shard encrypted with the passphrase.

Example:

const result = await lockbox.backupClientShard(encryptedClientShard);
console.log("Encrypted client shard: ", result);
//..

info

Sky Mavis supports only MPC_CMP_ECDSA_SECP256K1, compatible with most EVM (Ethereum Virtual Machine) chains.

Here's a complete example:

// Initialize lockbox

// Create a handler to create a wallet
const handleCreateWallet = async () => {
  try {
    // Setup password
    const passphrase = `${PASSPHRASE}`;
    // Generate MPC key for new wallet
    const response = await lockbox.genMpc();
    // Set client shard
    lockbox.setClientShard(response.key);
    // Encrypt client shard
    const encryptedResult = await lockbox.encryptClientShard(passphrase, 8);
    // Back up key to server
    await lockbox.backupClientShard(encryptedResult.encryptedKey);
  } catch (error) {
    console.error(error);
  }
};

Unity

Create an MPC key:

Task<(bool success, MPCError error)> MPC.Keygen(string password);

Example:

string password = $"{RECOVERY_PASSWORD}";

var privateKeyShard = await MPC.Keygen(password);
if (privateKeyShard.error != null) {
  Debug.LogError($"Error when generating MPC private key: {privateKeyShard.error.message}");
} else {
  Debug.Log($"Result of MPC key generation: {privateKeyShard}");
}

Step 4. Retrieve wallet address

Web

Retrieve the wallet's public key to use for transactions.

Function signature:

async function getUserProfile()

Result:

Name	Type	Description
address	String	MPC address.
updatedAt	Number	Latest updated profile time.
uuid	String	User ID .

Example:

const result = await lockbox.getUserProfile();
console.log("Address : ", result.address);

Unity

After the MPC wallet is generated, you can retrieve its public address as follows:

// Initialize the MPC environment
await MPC.Initialize(CreateAccessToken(userId), Environment.Production);
Debug.Log($"Wallet address: {MPC.WalletAddress}");
string address = MPC.WalletAddress;

Step 5. Verify wallet creation

Form a request to the Mavis Account service to verify the wallet creation.

Request:

GET https://api-gateway.skymavis.com/account/userinfo
X-API-Key: {YOUR_API_KEY} // API key from the Developer Console
Authorization: Bearer {ACCESS_TOKEN} // User's access token

Response:

{
  "ronin_address": "<string>",
  "wallet_type": "mpc"
}

The ronin_address field must match the wallet public key. The wallet_type field must be equal to mpc.

Next steps

Send a transaction