How to Sign with a PDA's Account
Program derived addresses (PDA) can be used to have accounts owned by programs that can sign. This is useful if you want a program to own a token account and you want the program to transfer tokens from one account to another.
sign-with-pda.rs
use solana_program::{
account_info::next_account_info, account_info::AccountInfo, entrypoint,
entrypoint::ProgramResult, program::invoke_signed, pubkey::Pubkey, system_instruction,
};
entrypoint!(process_instruction);
fn process_instruction(
_program_id: &Pubkey,
accounts: &[AccountInfo],
instruction_data: &[u8],
) -> ProgramResult {
let account_info_iter = &mut accounts.iter();
let pda_account_info = next_account_info(account_info_iter)?;
let to_account_info = next_account_info(account_info_iter)?;
let system_program_account_info = next_account_info(account_info_iter)?;
// pass bump seed for saving compute budget
let bump_seed = instruction_data[0];
invoke_signed(
&system_instruction::transfer(
&pda_account_info.key,
&to_account_info.key,
100_000_000, // 0.1 SOL
),
&[
pda_account_info.clone(),
to_account_info.clone(),
system_program_account_info.clone(),
],
&[&[b"escrow", &[bump_seed]]],
)?;
Ok(())
}