Solana: How to Close PDA Token Account

February 4, 2025 Dedon CRYPTOCURRENCY

Closing a Public Data Account (PDA) on Solana: A Step-by-Step Guide

Closing a public data account (PDA) on Solana can be a bit tricky, especially when you are not familiar with the Anchor protocol and its nuances. In this article, we will walk you through the process of closing a PDA token account using the Anchor SDK.

Prerequisites:

You have a Solana node set up and running.

You have an Anchor wallet installed on your Solana node.

You understand the basics of public data accounts (PDAs) and their use in the Anchor protocol.

Step 1: Create a PDA Account

First, create a new PDA account using the Anchor SDK. This involves generating a new mnemonic phrase and creating a new PDA account with a specific name, purpose, and other metadata.


use anchor_lang::account_info;
use anchor_lang::entrypoint;
#[entrypoint]
fn main() {
// Create a new PDA account
let mut create_pda = AccountInfo::from_id("PdaAccountId");
create_pda.set_name("MyPdaAccountName").set_purpose("SomePurpose").set_metadata(vec![]);
let _ = anchor_lang::script::create_pda(create_pda).signers();
}

Step 2: Get the PDA Account ID

Next, you need to get the PDA account ID associated with your newly created account. You can do this by querying the solana_token database for all token accounts that are part of a PDA.


use solana_sdk::entrypoint::get_pda_account_id;
// Get the PDA account ID
let pda_account_id = get_pda_account_id("some_mnemonic");

Step 3: Closing the PDA account

Now, you can close the PDA account using the Anchor SDK. You will need to pass the PDA account ID and the reason for closing the account.


use anchor_lang::entrypoint;
#[entrypoint]
fn main() {
// Get the current state of the account
let mut account_state = AccountState::new();
// Close the PDA account
account_state.close_pda_account(pda_account_id, "ReasonForClosing".to_string()).signers();
}

Step 4: Update the token account

Finally, you will need to update the token account associated with your closed PDA account to reflect the new state of the PDA. This involves updating the solana_token database with the new account ID.


use solana_sdk::entrypoint::update_token_account;
// Update the token account
let mut update_token_account = AccountUpdate::new().set_pda_account_id(pda_account_id).signers();
update_token_account.sign(&account_state);

That’s it! With these steps, you should be able to close a PDA token account in Solana using the Anchor SDK. Remember to keep your mnemonic phrase safe and use it only for this purpose.

Use case example:

Here’s an example of how you can use the Anchor SDK to close a PDA account in a larger application:


use anchor_lang::account_info;
use anchor_lang::entrypoint;
#[entrypoint]
fn main() {
// Create a new PDA account
let mut create_pda = AccountInfo::from_id("PdaAccountId");
create_pda.set_name("MyPdaAccountName").set_purpose("SomePurpose").set_metadata(vec![]);
let _ = anchor_lang::script::create_pda(create_pda).signers();
// Get the PDA account ID
let pda_account_id = get_pda_account_id("some_mnemonic");
// Close PDA account
account_state.close_pda_account(pda_account_id, "ReasonForClosing".to_string()).signers();
// Update token account
update_token_account(
AccountUpdate::new().set_pda_account_id(pda_account_id).signers(),
).sign(&account_state);
}

I hope this article was helpful in understanding how to close a PDA token account in Solana using the Anchor SDK! Let me know if you have any further questions or need any additional help.

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