// GLOSSARY -- AGENTIC FINANCE

What is Intent Fingerprinting?

1 min read Updated

Intent fingerprinting creates a cryptographic fingerprint of an agent's stated transaction intent and verifies it against the actual transaction submitted, detecting discrepancies between declared purpose and execution.

WHY IT MATTERS

When an agent requests a transaction — "swap 50 USDC for ETH on Uniswap" — the actual calldata could differ. Intentionally (compromised) or not (hallucination).

Intent fingerprinting links declared intent to on-chain action. The purpose is hashed and compared against decoded parameters. Mismatches trigger blocks.

Critical for complex DeFi where calldata is opaque. An agent says "deposit into Aave" but calldata targets a different contract. Fingerprinting catches this before signing.

HOW POLICYLAYER USES THIS

PolicyLayer uses intent fingerprinting in its Two-Gate verification — first gate validates intent against policies, second verifies the transaction matches. Double-check prevents both policy violations and intent divergence.

FREQUENTLY ASKED QUESTIONS

Different from simulation?
Simulation checks outcomes in a sandbox. Fingerprinting structurally compares declared purpose against calldata. Complementary — simulation checks results, fingerprinting checks honesty.
Can an agent fake it?
Not if fingerprinting happens externally (PolicyLayer). The policy layer independently decodes and compares — the agent can't manipulate the check.
Latency?
Sub-millisecond. Decoding calldata and comparing parameters is trivial computation.

FURTHER READING

Enforce policies on every tool call

Intercept is the open-source MCP proxy that enforces YAML policies on AI agent tool calls. No code changes needed.

npx -y @policylayer/intercept
github.com/policylayer/intercept →
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