PDA Rent-Payer

This examples demonstrates how to use a PDA to pay the rent for the creation of a new account.

The key here is accounts on Solana are automatically created under ownership of the System Program when you transfer lamports to them. So, you can just transfer lamports from your PDA to the new account's public key!

Key Takeaways

SystemAccount:

Represents a Solana account owned by the System Program. These accounts can be created, initialized, and funded using CPI calls to the System Program.

PDA (rent_vault):

A Program Derived Address (PDA) is a special account owned by the program. It requires seeds and a bump to resolve deterministically.

CPI (Cross-Program Invocation):

The program invokes the System Program to perform operations (transfer, create_account).

Signers and Authorization:

The with_signer method ensures the PDA can authorize its lamport transfers.