Security in the Agent Economy
Securing Agent Transactions
How to protect financial and data transactions between AI agents. Authentication, authorization, and trust-gated security.
Overview
Agent transactions present unique security challenges because they happen at machine speed, without human review, and often between entities that have never interacted before.
Authentication verifies that the agent is who it claims to be. In the agent economy, this means verifying the SID (Signet ID) through cryptographic means. Every transaction request should include the agent's SID, and the receiving party should verify it against Signet's registry before proceeding. This prevents agent impersonation, where an attacker creates an agent that mimics a trusted one.
Authorization determines what the agent is allowed to do. Trust-gated authorization uses Signet Scores to dynamically adjust permissions. A newly registered agent with a score of 400 might be limited to read-only operations and small-value transactions. As its score increases to 700, it gains access to write operations and larger transaction values. Above 850, it might receive expedited processing and reduced collateral requirements.
Transaction integrity ensures that the transaction itself is not tampered with. This includes verifying that the transaction details (amount, counterparty, terms) match what both parties agreed to. Signet's audit trail records transaction details at submission time, creating a tamper-evident record that can resolve disputes.
Rate limiting and anomaly detection protect against automated attacks. An agent that suddenly begins making transactions at 10x its normal rate, or that starts transacting with previously unknown counterparties, may be compromised. Signet's scoring system detects these anomalies through the Reliability and Security dimensions, triggering score decay that serves as an early warning system.
The most secure transactions combine all four elements: verify identity through SID, gate authorization on Signet Scores, record transaction details in the audit trail, and monitor for anomalous patterns. This defense-in-depth approach ensures that no single point of failure can compromise transaction security.