Open source · MIT

Prove what your AI agents did.

agentproof is a tamper-evident flight recorder for AI agents.

A receipt for every move your AI makes, which no one can quietly edit later. Not even you.

Every tool call, decision and payment your agent makes gets signed with Ed25519 and chained to the entry before it. Anyone can check the record later, with only your public key, without trusting the agent's own summary or trusting you.

pip install git+https://github.com/cipherxsniper/agentproof.git
Ed25519 signaturesSHA-256 hash chainverifies offlinecrash-safe appends

A real signed log: a refund agent

public key
  1. 1. An AI refund agent did 6 things. Each one below is signed and linked to the one before it.
  2. 2. Your browser checks every signature right now. Nothing is sent anywhere.
  3. 3. Press Change the refund to $640, the kind of edit someone might try after the fact, and watch the proof break.
Checking…
How it works

Three ideas, no blockchain required

Sign every action

Each event is serialized deterministically and signed with your Ed25519 key at the moment your code records it.

Chain the entries

Each entry stores the SHA-256 hash of the one before it. Editing, deleting or inserting anything breaks every link after it.

Verify from outside

Anyone with your public key can re-check every signature and link, offline, in Python or right here in the browser.

Hook it into your stack

Five minutes to a verifiable agent


  
Verify a log

Check anyone's agent log, right here

Paste a log and a public key.

Nothing leaves your browser

The check runs locally with the Web Crypto API: the same rules as agentproof verify. Each entry's link to the previous hash, its own hash, and its Ed25519 signature are all re-computed.

Teams use this to hand an auditor, customer or lender a log they can check without database access and without taking anyone's word for it.

For business data, too

proofchain turns any Postgres table (payouts, invoices, trades) into the same kind of signed chain: pip install proofchain-cli.

Running in production

Built for, and used by, a real autonomous system

130+ signing identities, one channel

A multi-server trading and research operation where Claude sessions, Codex and a council of models from several labs coordinate over a signed, hash-chained message bus: 7,500+ messages, each verifiable.

Bitcoin-anchored track record

Every live trading decision, buy or skip, is hash-chained with its outcome and anchored in Bitcoin via OpenTimestamps as it happens, so the record cannot be rewritten after the fact. See the live record ↗

Policy before action

Spending rules are checked and the decision is signed before the agent acts, so a denied payment is on the record too.

Straight answers

What a signature can and can't prove

Pricing

Start free. Get it wired in for you in two weeks.

Open source

$0

MIT licensed

  • The agentproof library and CLI
  • The in-browser verifier on this page
  • Docs and examples
Install it

Founding pilot

$490 one-time
First 5 teams
  • Two weeks, one of your agent workflows integrated
  • Every tool call, decision and payment signed and hash-chained
  • A hosted verify page your customers or auditors can use
  • A tamper-test report and a walkthrough for your team
Book a pilot call

Ongoing

$99 / month

After the pilot. Cancel anytime.

  • Hosted verification
  • Daily roots anchored in Bitcoin (OpenTimestamps)
  • Monitoring and email support
Talk to me
Founder

Thomas Lee Harvey

Founder and solo developer · fintech AI · near Las Vegas, Nevada

I build fintech AI systems end to end. My own operation runs two live trading engines on two servers, with a crew of AI agents (Claude, Codex and a council of models from several labs) that coordinate over a signed, hash-chained message bus: 7,500+ messages from 130+ signing identities, every one verifiable. Every live trading decision, buy or skip, is chained and timestamped in Bitcoin as it happens, and every strategy is pre-registered and tested on data it has never seen. Explore the live chain in agentproof scan ↗

agentproof is the audit layer I built for that system, packaged so your agents can have it too. Tell me what your agents do and I'll reply within a day with a plan.

Book a pilot call →tommyleeharvey17@gmail.com GitHub ↗