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

# Sign Solana transactions

> This guide will walk you through how to sign a Solana transaction using the Enclave MPC API.

Signing a Solana transaction is identical to how we sign an Ethereum transaction with the exception that we need to pass in the Solana specific RPC URL, chain ID, and method. In the example we are going to update:

* `chainID` to `solana:4uhcVJyU9pJkvQyS88uRDiswHXSCkY3z`
* `rpcUrl` to `https://api.testnet.solana.com`
* `method` to `sol_signAndConfirmTransaction`
* `params` to a base64 encoded serialized Solana transaction

Here is a short snippet of how to get the `params` using `@solana/web3.js`, for a complete example checkout [this](https://github.com/portal-hq/Enclave-MPC-API-Examples/tree/main/Javascript) example repo:

```ts theme={null}
  const {
    Transaction,
    SystemProgram,
    LAMPORTS_PER_SOL,
  } = require('@solana/web3.js');

  const tx = new Transaction({
    recentBlockhash: blockhash,
    feePayer: feePayerAddress,
  }).add(
    SystemProgram.transfer({
      fromPubkey: fromPublicKey,
      toPubkey: toPublicKey,
      lamports: LAMPORTS_PER_SOL * 0.01, // 0.01 SOL
    }),
  );

  // Serialize the transaction to a Buffer
  const serializedTransaction = tx.serialize({ requireAllSignatures: false });

  // Convert the serialized Buffer to a Base64 string
  const base64Transaction = serializedTransaction.toString('base64');

  // Sign the transaction
  const signResponse = await axios.post(
    `${PORTAL_MPC_CLIENT_URL}/v1/sign`,
    {
      share: share,
      method: 'sol_signTransaction',
      params: base64Transaction,
      chainId: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
    },
    {
      headers: { Authorization: `Bearer ${clientApiKey}` },
    },
  );
```

Below is an example curl command for signing a Solana message:

```bash theme={null}
curl -X POST 'https://mpc-client.portalhq.io/v1/sign' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <clientApiKey>' \
  -d '{
    "share": "ED25519.share",
    "method": "sol_signTransaction",
    "params": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAEDqF/lgjmUoeVVHb3ObBSh4S4W1vrG333tiaGvUzWHYDLkuw5hIt53j8IqHX8I+gj28DXUsAE3bgbROXDHpUdhhAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAlNc9WKVngB8ANy0SFkCbEM6i7nZKuqAgsFEvoZkO4/ABAgIAAQwCAAAAECcAAAAAAAA=",
    "chainId": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
  }'
```