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To rely on Privy’s API to fill in the recentBlockhash field of the Solana transaction, pass in the dummy value 11111111111111111111111111111111 for the recentBlockhash field.
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To send a transaction from a wallet using the React SDK, use the signAndSendTransaction method from the useSignAndSendTransaction hook:
signAndSendTransaction: (input: {
  transaction: Uint8Array;
  wallet: ConnectedStandardSolanaWallet;
  chain?: SolanaChain;
  options?: SolanaSignAndSendTransactionOptions & {
    uiOptions?: SendTransactionModalUIOptions;
    sponsor?: boolean;
  };
}) => Promise<{ signature: Uint8Array }>

​
Usage

import {useSignAndSendTransaction, useWallets} from '@privy-io/react-auth/solana';
import {
  pipe,
  createSolanaRpc,
  getTransactionEncoder,
  createTransactionMessage,
  setTransactionMessageFeePayer,
  setTransactionMessageLifetimeUsingBlockhash,
  appendTransactionMessageInstructions,
  compileTransaction,
  address,
  createNoopSigner
} from '@solana/kit';
import {getTransferSolInstruction} from '@solana-program/system';

// Inside your component
const {signAndSendTransaction} = useSignAndSendTransaction();
const {wallets} = useWallets();

const selectedWallet = wallets[0];

const amount = 1;

const transferInstruction = getTransferSolInstruction({
  amount: BigInt(parseFloat(amount) * 1_000_000_000), // Convert SOL to lamports
  destination: address('RecipientAddressHere'),
  source: createNoopSigner(address(selectedWallet.address))
});

// Configure your RPC connection to point to the correct Solana network
const {getLatestBlockhash} = createSolanaRpc('https://api.mainnet-beta.solana.com'); // Replace with your Solana RPC endpoint
const {value: latestBlockhash} = await getLatestBlockhash().send();

// Create a transaction using @solana/kit
const transaction = pipe(
  createTransactionMessage({version: 0}),
  (tx) => setTransactionMessageFeePayer(address(selectedWallet.address), tx), // Set the message fee payer
  (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx), // Set recent blockhash
  (tx) => appendTransactionMessageInstructions([transferInstruction], tx), // Add your instructions to the transaction
  (tx) => compileTransaction(tx), // Compile the transaction
  (tx) => new Uint8Array(getTransactionEncoder().encode(tx)) // Finally encode the transaction
);

// Send the transaction
const result = await signAndSendTransaction({
  transaction: transaction,
  wallet: selectedWallet
});

console.log('Transaction sent with signature:', result.signature);

​
Parameters

​
Returns

​
signature
Uint8Array
The signature of the transaction.

​
Sign and send all transactions

To sign and send multiple transactions in a single call, use the signAndSendTransaction method with multiple inputs:
signAndSendTransaction(...inputs: SignAndSendTransactionInput[]): Promise<SignAndSendTransactionOutput[]>

​
Usage

import {useSignAndSendTransaction, useWallets} from '@privy-io/react-auth/solana';
import {
  pipe,
  createSolanaRpc,
  getTransactionEncoder,
  createTransactionMessage,
  setTransactionMessageFeePayer,
  setTransactionMessageLifetimeUsingBlockhash,
  appendTransactionMessageInstructions,
  compileTransaction,
  address,
  createNoopSigner
} from '@solana/kit';
import {getTransferSolInstruction} from '@solana-program/system';

// Inside your component
const {signAndSendTransaction} = useSignAndSendTransaction();
const {wallets} = useWallets();

const selectedWallet = wallets[0];

const amount = 1; // Amount of SOL to send

const transferInstruction = getTransferSolInstruction({
  amount: BigInt(amount * 1_000_000_000), // Convert SOL to lamports
  destination: address('RecipientAddressHere'),
  source: createNoopSigner(address(selectedWallet.address))
});

// Configure your RPC connection to point to the correct Solana network
const {getLatestBlockhash} = createSolanaRpc('https://api.mainnet-beta.solana.com'); // Replace with your Solana RPC endpoint
const {value: latestBlockhash} = await getLatestBlockhash().send();

// Create transactions using @solana/kit
const transactions = [
  pipe(
    createTransactionMessage({version: 0}),
    (tx) => setTransactionMessageFeePayer(address(selectedWallet.address), tx), // Set the message fee payer
    (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx), // Set recent blockhash
    (tx) => appendTransactionMessageInstructions([transferInstruction], tx), // Add your instructions to the transaction
    (tx) => compileTransaction(tx), // Compile the transaction
    (tx) => new Uint8Array(getTransactionEncoder().encode(tx)) // Finally encode the transaction
  ),
  pipe(
    createTransactionMessage({version: 0}),
    (tx) => setTransactionMessageFeePayer(address(selectedWallet.address), tx),
    (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
    (tx) => appendTransactionMessageInstructions([transferInstruction], tx),
    (tx) => compileTransaction(tx),
    (tx) => new Uint8Array(getTransactionEncoder().encode(tx))
  )
];

// Send multiple transactions
const results = await signAndSendTransaction(
  {
    transaction: transactions[0],
    wallet: selectedWallet
  },
  {
    transaction: transactions[1],
    wallet: selectedWallet
  }
);

console.log(
  'Transactions sent with signatures:',
  results.map((result) => result.signature.toString()).join(',')
);

​
Parameters

For complete examples of sending SOL and SPL tokens using Privy’s SDKs, check out the sending a SOL transaction recipe and the sending SPL tokens recipe.