ProofTrail

What it does: ProofTrail is a lightweight SDK and API that gives AI agents persistent, verifiable memory on Filecoin. Any agent builder drops in three functions — log(), remember(), and recall() — and from that point every decision their agent makes, every piece of memory it stores, gets written to Filecoin and returned with a cryptographic CID as proof. The data is tamper-proof, persistent across sessions, and fully auditable.

The problem it solves: Most AI agents today have no memory between sessions and no audit trail of their behavior. When an agent makes a financial decision, triggers an action, or claims to remember a user preference, there's no verifiable record. ProofTrail is the infrastructure layer that changes that — making agent behavior persistent, transparent, and trustless.

How it uses Filecoin: Every call to ProofTrail's log() or remember() endpoints writes JSON data to Filecoin via the Synapse SDK (@filoz/synapse-sdk). The API returns a real Filecoin CID and deal ID as proof of storage. The demo shows these proofs appearing in real time as the agent interacts.

Tech stack:

Node.js / Express — API server @filoz/synapse-sdk — Filecoin storage Filecoin Calibration Testnet Railway — deployment Vanilla JS client library (zero dependencies)

Live links:

API: https://prooftrail-production-3ac7.up.railway.app Demo: https://itzbenhur.github.io/prooftrail/demo/index.html GitHub: https://github.com/Itzbenhur/prooftrail

Built by: Aaron (Druskii) — @nerdydruskii