Account Model

Why every Solana wallet, program, and data blob is one account type - ownership, rent, and the rules that make parallel execution possible.

The single abstraction behind all Solana state.

Lamports, owner, data, executable, and rent-epoch fields.

The rent-exempt minimum and why accounts must be funded.

Who can own and mutate what.

Why programs are stateless and store data in accounts.

The owner-writes rule and its security implications.

Serializing state into an account's byte buffer.

Allocation, funding, `realloc`, and reclaiming rent.

Designing account layouts that scale and stay safe.