Solana: How to determine all address lookup tables (ALTs) over which the Solana wallet has authority

01 Feb Solana: How to determine all address lookup tables (ALTs) over which the Solana wallet has authority

Here is an article on how to determine each address lookup table (ALT) that a Solana wallet has authority over:

Determine each address lookup table (ALT) that a Solana wallet has authority over

As a developer working with Solana, it is critical to understand how your wallet interacts with the blockchain. One aspect of this interaction that can be difficult to understand is address lookup tables (ALTs). In this article, we will detail how to determine each address lookup table that your Solana wallet has authority over.

What are address lookup tables (ALTs)?

Address lookup tables (ALTs) on the Solana blockchain serve as a mapping between accounts and their associated public keys. Each ALT defines a set of accounts that have access to specific data, such as transaction history or account balances. A thorough understanding of your wallet’s ALTs is essential to ensure data consistency, security, and efficient interactions with the network.

How ​​to Determine Your Wallet’s ALTs

To determine the address lookup tables that your Solana wallet has authority over, you can follow these steps:

Step 1: Check the solana CLI

The easiest way to find out which addresses have access to which data is to check the solana command line interface (CLI). Open a terminal and run:

solana list-accounts --address-types=account

This command will display a list of all the accounts in your wallet, along with their public keys. Look for any account types that have the prefix “A” in the key field.

Step 2: Check the solana CLI – Account List

The solana CLI also provides an option to list all account lists:

solana accounts --account-list

This will display a list of all accounts, including their public keys and address lookup tables.

Step 3: Inspect the Chaincode

To determine specific ALTs for a particular data type (such as transactions or accounts), you need to examine the chaincode. Solana chaincodes are written in Rust, an executable language that interacts directly with the blockchain. You can use tools like solc and rust-ccache to compile and analyze your chaincode.

For example, let’s say you have a simple account data type:

structure AccountData {
pub balances: [u8; 32],
}
implement account data {
fn new(account_id: u64) -> Borrow {
// Create a new AccountData instance for the specified account ID
}
}

You can then use the solc tool to compile and parse your chaincode:

solc -v --name my-chaincode --input-file my-chaincode.rs

This will generate compiled Rust code that you can parse for specific ALTs.

Step 4: Inspect the Chaincode – Address Lookup Table (ALT) Generation

When generating an address lookup table, Solana uses a process called “address lookup table generation” that involves:

• Creating a private key for each account type.

• Assigning public keys to these accounts based on their corresponding private keys.

You can examine the generated chaincode to determine which addresses have access to specific data and which ALTs are created:

// Generate an address lookup table (ALT) for transactions
chaincode_generate_transactionalt(my_account_id, &mut transaction_data);

A new TransactionAlt instance will be created that represents the generated ALT.