Arc 11 Catch-Up: Composing Solana Programs with CPIs

Short summary

This tutorial covers Cross-Program Invocations (CPIs) on Solana, explaining how programs call other programs to perform operations they don't own — like transferring SOL via the System Program or minting tokens via Token-2022. CPIs preserve Solana's security model where owner programs control their own state, while executing atomically within the same transaction. The article walks through privilege boundaries, signer authority propagation, and PDA-based authority for more advanced CPI patterns.

• •CPIs let Solana programs call other programs while preserving ownership boundaries and atomic execution
• •Signer authority and writable access cannot be escalated during a CPI — they must exist in the outer transaction
• •PDA-controlled authority enables programs to sign inner instructions without a wallet signer

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