Using session keys

How to create and manage session keys

Session keys are programmable access tokens with specific permissions, designed for controlled interactions. Examples include:

Granting access to specific areas or features.
Limiting usage to a set amount of resources (e.g., 1000 units of currency).
Time-bound validity (e.g., expiring after 3 days). P ermissions can be combined, enabling fine-tuned, context-specific capabilities.

Session Keys streamline interactions by:

Seamless Interactions: Reducing the need for repeated confirmations by delegating specific permissions to locally stored keys, enhancing user experience.
Automated Processes: Enabling automation through server-bound keys with defined permissions for tasks like recurring actions, resource management, or condition-based triggers.

Check out our sample registering a session key with an account with a non-custodial signer: GitHub source.

Configuration#

This section will guide you through the process of registering a session key and using it to mint an asset with a player's smart account. You can choose to create the session key using a web3 libraries or using the Openfort native method.

Using EIP-7715. The request method of the EIP-1193 provider can be used to request signatures. First, get the provider:

client.tsx

openfortConfig.ts

import openfort from "./openfortConfig"
// This example assumes you have already checked that Openfort 'embeddedState' is 
// `ready` and the user is `authenticated`
const provider = openfort.getEthereumProvider();

Smart wallets support sending a batch of transactions in a single, atomic submission to the network.

To register a session key with a smart wallet, call the wallet_grantPermissions method.

As an example, you might batch together a transaction to approve a USDC spender and to transfer USDC like so:

import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts';
const sessionKey = generatePrivateKey();
const accountSession = privateKeyToAccount(sessionKey).address;
await provider.request({
  method: 'wallet_grantPermissions',
  params: [
    {
      signer:{
        type: "account",
        data:{
          id: accountSession
        }
      },
      expiry: 60 * 60 * 24,
      permissions: [
        {
          type: 'contract-call',
          data: {
            address: '0x2522f4fc9af2e1954a3d13f7a5b2683a00a4543a',
            calls: []
          },
          policies: []
        }
      ],
    },
  ],
});

Popular web3 libraries provide convenient methods for registering session keys:

Library	Method
Viem	Use the `wallet_grantPermissions` action