Here’s an article on how to specify each address lookup table (ALT) that your Solana wallet has permissions over:
Define each address lookup table (ALT) that your Solana wallet has permissions over
As a developer working with Solana, understanding how your wallet interacts with the blockchain is crucial. One aspect of this interaction that can be difficult to understand is the address lookup tables (ALT). In this article, we’ll dive into how you can specify each address lookup table that your Solana wallet has permissions over.
What are address lookup tables (ALT)?
The address lookup tables (ALT) in the Solana blockchain act as a mapping between accounts and their corresponding public keys. Each ALT table 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 ALT tables is essential to ensuring data integrity, security, and efficient interactions with the network.
How to determine your wallet’s ALTs
To determine the lookup tables of addresses that your Solana wallet has permissions over, you can follow these steps:
Step 1: Check the solana CLI
The easiest way to check which addresses have access to your data is to check the solana command line interface (CLI). Open a terminal and run:
solana list-accounts --address-types=account
This command will list all the accounts in your wallet along with their associated public keys. Look for account types that have the prefix “A” in the key field.
Step 2: Check solana CLI – List of accounts
solana CLI also offers an option to list all accounts:
solana accounts --list-accounts
This command will list all accounts, including their corresponding public keys and address lookup tables.
Step 3: Check Chaincode
To determine the specific ALT for a specific data type (e.g. transactions or accounts), you need to check Chaincode. Solana chaincodes are written in Rust, which is an executable language that directly interacts 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:
struct AccountData {
pub balances: [u8; 32],
}
impl AccountData {
fn new(account_id: u64) -> Self {
// Create a new AccountData instance for the given account ID
}
}
Then you can use the solc tool to compile and analyze your chaincode:
solc -v --name my-chaincode --input-file my-chaincode.rs
This will generate compiled Rust code that you can analyze for specific ALTs.
Step 4: Inspect Chaincode – Generating Address Lookup Table (ALT)
When generating the address lookup table, Solana uses a process called “generating address lookup table” which 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 which data and what ALTs are created:
// Generate an address lookup table (ALT) for the transaction
chaincode_generate_transactionalt(my_account_id, &mut transaction_data);
This will create a new TransactionAlt instance that represents the generated ALT.