Solana: Can a PDA account created in a program be allowed to use in another program to sign?
Using a Programmatic Public Address (PDA) Account in Another Program
In the Solana ecosystem, a PDA (Programmatic Public Address) account allows for the secure and efficient management of token transfers. However, when it comes to using this account in another program or application, there are certain requirements that must be met.
Fund
A PDA is a public address that any program can use to receive funds. However, not all programs allow withdrawals to their PDA accounts. To address this issue, we need to consider how the withdrawal process works and what is required to use the account in another program.
Cancellation Process
When creating a PDA account on Solana, the following steps occur:
- The program creates a PDA account using its own wallet.
- When a user withdraws funds from their PDA account, the withdrawal transaction is sent to the program’s PDA account.
- The program’s PDA account signs the withdrawal transaction with its private key, which allows verification of the sender and the amount being withdrawn.
Problem
Let’s now consider how an account created in the program can use a whitelist-based withdrawal process that only allows users from certain whitelisted addresses to withdraw funds. This requires additional configuration and adjustments:
- The PDA account must be configured to accept withdrawals from the original program.
- The original program must implement a function that notifies the whitelisting service of an attempted withdrawal using the public address of the PDA account.
- When a user attempts to withdraw funds from their PDA account, the following steps occur:
a. The user initiates a withdrawal transaction and sends it to the network.
b. If the original program has correctly configured the PDA account, it will sign the withdrawal transaction with its private key.
Solution
To solve this problem, we can implement a custom solution that allows an account created in the program to use a whitelist-based withdrawal process when connected to the same Solana network. Here is one possible approach:
- Deploy a new wallet in the original program that provides a PDA-like address.
- Configure the new wallet to accept withdrawals from its public address using the original program’s private key.
- When an account created in the original program attempts to withdraw funds, it can use the new wallet’s PDA-like address to sign the withdrawal transaction.
Sample Code
Here is a simple example of how this can be implemented using the Solana SDK:
“` typing
import {account, program} from “@solana/web3.js”;
import { splTokenProgram } from “./spl-token-program”;
const originalProgram = new Program(splTokenProgram, “original_program”);
const newWallet = newAccount(“new_wallet”, “new_wallet_address”);
async function returnFunds(account: Account) {
// Get the private key from the account’s PDA address
const privateKey = await account.getPrivate();
// Create a new wallet with a new PDA address
const newWalletProgram = new Program(splTokenProgram, “new_wallet_program”);
const newWalletAddress = await newWalletProgram.createAccount(privateKey);
// Sign the withdrawal transaction using the new PDA address
const returnTransaction = {
account,
amount: splTokenProgram.amount,
};
const signedTransaction = await originalProgram.signTransaction(withdrawalTransaction, privateKey);
// Send the signed transaction to the network
await originalProgram.sendSignedTransaction(signedTransaction);
}
// Usage:
const newWallet = await originalProgram.newWallet();
newWalletProgram = await newWallet.createAccount(newWalletAddress);
withdraw funds (original program.
