Accounts
- Has an address (public key) and an owner (address of a program account)
- Store state/data
- "Files" on the network ledger
- Each account has a unique address
- Size limits
- Normal accounts --> 10MB
- PDA accounts --> 10KB
- PDA accounts can be used to sign on behalf of programs
- Account size fixed at creation time
- Can be adjusted with
realloc
- Can be adjusted with
- Data storage is paid with rent
- Prevents accounts from being deleted
- Default account owner is the System Program
Types of accounts
- Data accounts
- Store data
- Types
- System owned accounts
- Program Derived Address accounts
- Program accounts
- Store executable programs
- Do not store state
- Native accounts
- Native Solana programs
- Eg. System, Stake, and Vote programs
Fields
| Field | Description |
|---|---|
| lamports | Number of lamports owned by account |
| owner | Program owner of account |
| executable | Whether the account can process instructions |
| data | Raw data byte array stored by the account |
| rent_epoch | Next epoch that the account will owe rent |
- Only a data account's owner can modify its data and debit lamports
- Anyone can credit lamports to a data account
- Owner of an account may assign a new owner if the account's data is zeroed out
Rent
- Storing data costs SOL
- If you maintain 2 years of rent in an account, you are exempt from paying rent
- Rent is paid during two different timings
- When referenced by a transaction
- Once an epoch
- A percentage of rent is destroyed, the rest is distributed to vote accounts
- If an account runs out of funds to pay rent, it is deallocated and the data is removed