> ## Documentation Index
> Fetch the complete documentation index at: https://docs.privy.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Using user signers

> Transact on user signer wallets using a valid user JWT for authenticated wallet operations

<View title="NodeJS" icon="node-js">
  Once you have created a wallet (or any other resource) with a user as an owner or signer, you can transact on that wallet with a valid user JWT. To do so using the NodeJS / Typescript SDK, the SDK will:

  1. Generate an ECDH P-256 keypair.
  2. Request a *time-bound session key* from the [`/v1/wallets/authenticate`](/api-reference/wallets/authenticate) endpoint using the user's JWT and the public key of the ECDH keypair.
  3. Send a transaction to the Wallet API, signed with the *time-bound session key*.

  The SDK will do this automatically whenever you set a `user_jwt` on the [authorization context](/controls/authorization-keys/using-owners/sign/signing-on-the-server) when making requests to a resource.

  ## Send a transaction via the Wallet API

  With the user's JWT, your application can request a transaction via the Wallet API by setting up the
  authorization context like so:

  ```ts theme={"system"}
  const authorizationContext = {
    user_jwts: ['insert-user-jwt']
  };
  ```

  Sending a transaction will look like this:

  ```ts theme={"system"}
  import {PrivyClient} from '@privy-io/node';

  const userJwt = 'insert-user-jwt';
  const walletId = 'insert-wallet-id';

  const privy = new PrivyClient({
    appId: 'insert-your-app-id',
    appSecret: 'insert-your-app-secret'
  });

  // This request will automatically include the privy-authorization-signature header.
  const res = await privy
    .wallets()
    .ethereum()
    .sendTransaction(walletId, {
      caip2: `eip155:8453`,
      params: {
        transaction: {
          // Transaction details go here...
        }
      },
      authorization_context: {user_jwts: [userJwt]}
    });
  ```
</View>