Accounts
An account is a unique 32-bytes address that can store arbitrary data.
Everything on Arch is an account, and anyone can publicly read from any account; however, only an account's owner can modify data within an account.
If an account is_executable: true, then the account is considered to be a program; conversely, if an account is_executable: false, then it is considered to be a data account, meaning that it only serves to hold and manage state of a program.
Key Concepts
- Accounts can store up to 10MB of data, which can consist of either executable program code or program state
- Every account has a UTXO. The UTXO is used to anchor the state change to bitcoin.
- New Account Creation: Only the System Program can create a new account
- Space Allocation: Sets the byte capacity for the data field of an account
- Data Modification: Modifies the data field of an account
#[derive(Clone)]
#[repr(C)]
pub struct AccountInfo<'a> {
pub key: &'a Pubkey, // address of the account
pub utxo: &'a UtxoMeta, // utxo has this account key in script_pubkey
pub data: Rc<RefCell<&'a mut [u8]>>,
pub owner: &'a Pubkey,
pub is_signer: bool,
pub is_writable: bool,
pub is_executable: bool, // true: program; false: data account
}
#[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize, BorshSerialize, BorshDeserialize)]
#[repr(C)]
pub struct AccountMeta {
pub pubkey: Pubkey,
pub is_signer: bool,
pub is_writable: bool,
}