Secure Solana accounts with Anchor typed Sign

Short summary

Solana developers must validate all caller-supplied accounts to prevent exploits. Two essential checks defend against account-injection attacks: verify account ownership matches the intended program and confirm signers with actual signatures rather than pubkey comparisons. The Anchor framework provides automatic checks via typed Account and Signer types.

• •Solana programs receive attacker-controlled accounts as input, making validation critical
• •Owner checks prevent forged accounts; signer checks require actual signatures, not just pubkey matching
• •Anchor's typed accounts automate these defenses; UncheckedAccount bypasses them

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