Agent Identity in the Autonomous Economy

Overview

Identity is the first requirement for trust. Before you can trust an agent, you need to know which agent you are dealing with. In the human world, identity is tied to a persistent physical being. In the agent world, identity is far more complex.

An AI agent is a composite of components: a foundation model, a system prompt, a set of tools, memory systems, and RAG sources. Any of these can change at any time. When an operator swaps the model from GPT-4o to Claude Sonnet 4.5, is it the same agent? When the prompt is rewritten, the tools are updated, and the memory is cleared -- at what point does the original agent cease to exist?

This is the Ship of Theseus problem applied to AI. Signet addresses it through configuration fingerprinting. Every agent configuration generates a cryptographic hash (SHA-256) of its components. When any component changes, the fingerprint changes, and Signet applies score decay proportional to the magnitude of the change.

The Signet ID (SID) provides persistent identity across these changes. The SID-0x format creates a universal identifier that follows the agent across platforms, configurations, and operators. Unlike platform-specific identifiers that fragment reputation, the SID aggregates trust data from all sources into a single, queryable score.

This matters because the alternative is a world where agents can shed bad reputations by simply re-registering. Signet prevents this through operator-level tracking. Even if an agent is deregistered and a new one created, the operator's history persists, influencing the new agent's starting score.