How to Create a PDA's Account
Accounts found at Program Derived Addresses (PDAs) can only be created on-chain. The accounts have addresses that have an associated off-curve public key, but no secret key.
To generate a PDA, use findProgramAddressSync
with your required seeds.
Generating with the same seeds will always generate the same PDA.
Generating a PDA
import { PublicKey } from "@solana/web3.js";
const programId = new PublicKey("G1DCNUQTSGHehwdLCAmRyAG8hf51eCHrLNUqkgGKYASj");
let [pda, bump] = PublicKey.findProgramAddressSync(
[Buffer.from("test")],
programId,
);
console.log(`bump: ${bump}, pubkey: ${pda.toBase58()}`);
// you will find the result is different from `createProgramAddress`.
// It is expected because the real seed we used to calculate is ["test" + bump]
Create an Account at a PDA
Program
use solana_program::{
account_info::next_account_info, account_info::AccountInfo, entrypoint,
entrypoint::ProgramResult, program::invoke_signed, pubkey::Pubkey, system_instruction, sysvar::{rent::Rent, Sysvar}
};
entrypoint!(process_instruction);
fn process_instruction(
program_id: &Pubkey,
accounts: &[AccountInfo],
instruction_data: &[u8],
) -> ProgramResult {
let account_info_iter = &mut accounts.iter();
let payer_account_info = next_account_info(account_info_iter)?;
let pda_account_info = next_account_info(account_info_iter)?;
let rent_sysvar_account_info = &Rent::from_account_info(next_account_info(account_info_iter)?)?;
// find space and minimum rent required for account
let space = instruction_data[0];
let bump = instruction_data[1];
let rent_lamports = rent_sysvar_account_info.minimum_balance(space.into());
invoke_signed(
&system_instruction::create_account(
&payer_account_info.key,
&pda_account_info.key,
rent_lamports,
space.into(),
program_id
),
&[
payer_account_info.clone(),
pda_account_info.clone()
],
&[&[&payer_account_info.key.as_ref(), &[bump]]]
)?;
Ok(())
}
Client
import {
clusterApiUrl,
Connection,
Keypair,
Transaction,
SystemProgram,
PublicKey,
TransactionInstruction,
LAMPORTS_PER_SOL,
SYSVAR_RENT_PUBKEY,
} from "@solana/web3.js";
(async () => {
// program id
const programId = new PublicKey(
"7ZP42kRwUQ2zgbqXoaXzAFaiQnDyp6swNktTSv8mNQGN",
);
// connection
const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
// setup fee payer
const feePayer = Keypair.generate();
const feePayerAirdropSignature = await connection.requestAirdrop(
feePayer.publicKey,
LAMPORTS_PER_SOL,
);
await connection.confirmTransaction(feePayerAirdropSignature);
// setup pda
let [pda, bump] = await PublicKey.findProgramAddress(
[feePayer.publicKey.toBuffer()],
programId,
);
console.log(`bump: ${bump}, pubkey: ${pda.toBase58()}`);
const data_size = 0;
let tx = new Transaction().add(
new TransactionInstruction({
keys: [
{
pubkey: feePayer.publicKey,
isSigner: true,
isWritable: true,
},
{
pubkey: pda,
isSigner: false,
isWritable: true,
},
{
pubkey: SYSVAR_RENT_PUBKEY,
isSigner: false,
isWritable: false,
},
{
pubkey: SystemProgram.programId,
isSigner: false,
isWritable: false,
},
],
data: Buffer.from(new Uint8Array([data_size, bump])),
programId: programId,
}),
);
console.log(`txhash: ${await connection.sendTransaction(tx, [feePayer])}`);
})();