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  "map_content": "Nonce and replay handling options\n- Session-scoped nonces (cheap): Maintain a per-session monotonic nonce off-chain (in the agent) and include it in the signed payload. Because the session key itself is on-chain and time-bound, replay outside the session is prevented, and within-session replay is blocked by the agent storing lastSeen nonces. For higher assurance across restarts, persist the highest nonce or an HMAC\u2019d used-set.\n- On-chain nonces (strongest, more gas): Keep a per-agent counter in the registry; prompts must include the current counter value and the agent increments it with a low-cost tx upon acceptance. Best for critical paths where replays must be provably impossible even if the agent\u2019s local state is compromised.",
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  "timestamp": "2026-02-09T00:10:39.000Z",
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