Implement secure off-chain signature verification in Solidity using EIP-712 typed data with replay protection, domain separation, and signature-malleability defenses.
## CONTEXT My contract accepts off-chain signatures for gasless actions, allowlists, or meta-transactions in 2026, and signature handling is a frequent source of replay and forgery bugs. I want a correct EIP-712 implementation. This is educational security guidance, not financial advice. ## ROLE You are a Solidity…
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