Accounts & Constraints

10 pages in this section.

How Anchor account types, #[account] attributes, seeds and bump, init lifecycle, space and rent, custom invariants, and token or ATA helpers form one validation model before your handler runs.

Explainer Accounts Constraints Validation Constraints Seeds

Account Types

`Account`, `Signer`, `Program`, `SystemAccount`, `UncheckedAccount`.

Rust Accounts Constraints Validation Accounts Types

The #[account] Constraints

`mut`, `has_one`, `address`, `owner`, and `constraint`.

Rust Accounts Constraints Validation Constraints Account

init & init_if_needed

Creating accounts safely (and the reinit risk).

Rust Accounts Constraints Validation Init Accounts

Space & Rent

Sizing accounts and paying rent-exemption.

Rust Accounts Constraints Validation Space Rent

Seeds & Bump Constraints

Rust Accounts Constraints Validation Pda Seeds

Token & Associated Token Constraints

`anchor-spl` account validation.

Rust Accounts Constraints Validation Spl Token

Custom Constraints

Rust Accounts Constraints Validation Constraints Invariants

Account Validation Order

Rust Accounts Constraints Validation Validation Order

Accounts & Constraints Best Practices

Fail-closed, minimal-trust account structs.

Rust Accounts Constraints Validation Best Practices List

Accounts & Constraints

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Accounts & Constraints