eip-4361 tag — Red Cup Engineering

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Sign-in-with-X on an x402 402: stateless wallet login for returning agents 2026-10-14 · article
How an x402 seller attaches a CAIP-122 sign-in challenge to its 402, verifies EIP-191 and EIP-1271 proofs with stateless HMAC nonces, and grants wallets access.