Accounts & Constraints

11 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

Learn about Anchor account wrapper types and their validation rules. Understand when to use Signer, Account, Program, and UncheckedAccount.

Rust Accounts Constraints Validation Accounts Types

The #[account] Constraints

Learn to use Anchor's #[account] constraints like mut, has_one, address, owner, and constraint to validate Solana accounts.

Rust Accounts Constraints Validation Constraints Account

init & init_if_needed

Learn to use init to create new accounts and init_if_needed to create accounts only when missing, and understand reinitialization risks.

Rust Accounts Constraints Validation Init Accounts

Space & Rent

Learn to size Solana accounts for rent exemption using Anchor's space attribute, InitSpace derive, and max_len for dynamic types.

Rust Accounts Constraints Validation Space Rent

Seeds & Bump Constraints

Rust Accounts Constraints Validation Pda Seeds

Token & Associated Token Constraints

Learn to use anchor-spl constraints for SPL Token and Associated Token accounts, simplifying mint and authority checks in your Solana programs.

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

Learn best practices for secure Anchor program development. Review account structs, type hygiene, constraints, and account sizing for robust Solana dApps.

Rust Accounts Constraints Validation Best Practices List

Accounts & Constraints Highlights Summary

A single-page roundup of every highlight bullet from the 10 pages in the Accounts & Constraints section, grouped by source page so you can scan all 59 takeaways without opening each article individually.

Highlights Summary Accounts Constraints Validation

Accounts & Constraints

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Accounts & Constraints