Proof Layer

Name: Proof Layer
Author: World-999-Labs

by World-999-Labsversion 1.0.1i★ –iRuns on your computer

Registry nameio.github.World-999-Labs/proof-layer

Install

Overview

Description from the maker (original English)

Signed, hash-chained provenance receipts for AI agent actions.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: PROOF_LAYER_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: PROOF_LAYER_API_KEY, PROOF_LAYER_API_URL, PROOF_LAYER_TELEMETRY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "proof-layer": {
      "command": "npx",
      "args": [
        "-y",
        "@proof-layer/mcp"
      ],
      "env": {
        "PROOF_LAYER_API_KEY": "your-value",
        "PROOF_LAYER_API_URL": "your-value",
        "PROOF_LAYER_TELEMETRY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add proof-layer --env PROOF_LAYER_API_KEY=your-value --env PROOF_LAYER_API_URL=your-value --env PROOF_LAYER_TELEMETRY=your-value -- npx -y @proof-layer/mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "proof-layer": {
      "command": "npx",
      "args": [
        "-y",
        "@proof-layer/mcp"
      ],
      "env": {
        "PROOF_LAYER_API_KEY": "your-value",
        "PROOF_LAYER_API_URL": "your-value",
        "PROOF_LAYER_TELEMETRY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "proof-layer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@proof-layer/mcp"
      ],
      "env": {
        "PROOF_LAYER_API_KEY": "your-value",
        "PROOF_LAYER_API_URL": "your-value",
        "PROOF_LAYER_TELEMETRY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

PROOF_LAYER_API_KEY secret required env
Your Proof Layer API key from https://prooflayer.world999labs.com/dashboard/keys
PROOF_LAYER_API_URL env
Override the default API endpoint (default: https://prooflayer.world999labs.com)
PROOF_LAYER_TELEMETRY env
Set to 'off' to disable anonymous usage telemetry (default: on)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account World-999-Labs, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32683 servers in this category
Published to the registry more recently than 8% of the other 32683 servers in this category
Basic checks equal to or better than 100% of the other 32683 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Proof Layer safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: PROOF_LAYER_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.1) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, MCP Server Autocad Lisp Helper

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Proof Layer

Cryptographic governance receipts for AI agents. Issued *before* the agent acts. Ed25519-signed. Hash-chained. Verifiable offline.

Built by WORLD999_LABS. Published on npm under @proof-layer/*. The legacy @veridocs/* package names continue to resolve and forward to the new ones.

What this repo contains

This is the public half of Proof Layer — the parts you install and run on your own machine:

Package	What it does	npm
`@proof-layer/mcp`	MCP server for Claude Desktop, Cursor, Cline, and any MCP-aware host
`@proof-layer/verify`	Standalone offline verifier — zero dependencies, audits any receipt bundle with just our public key

The kernel (governance engine, Gauntlet adversary/judge pipeline, billing, dashboard) is closed-source and runs at prooflayer.world999labs.com. Open-source clients + closed-source server is the same pattern Stripe, Resend, and Vercel use — you get full transparency on what runs locally and what data leaves your machine, while the proprietary server logic stays protected.

Quick start

npx -y @proof-layer/mcp@latest

Drop into Claude Desktop's claude_desktop_config.json:

"mcpServers": { "proof-layer": { "command": "npx", "args": ["-y", "@proof-layer/mcp@latest"], "env": { "PROOF_LAYER_API_KEY": "pl_live_...", "PROOF_LAYER_API_URL": "https://prooflayer.world999labs.com" } } } }

Restart Claude. Eight pl_* tools appear in the picker. Get an API key at prooflayer.world999labs.com.

Migrating from `@veridocs/mcp`? No code changes required. The legacy package name continues to resolve, the legacy vd_* tool names continue to work alongside pl_*, and existing VERIDOCS_API_KEY / VERIDOCS_API_URL environment variables are still accepted. You can switch the package name and env-var names on your own schedule.

Why pre-execution governance?

Most "AI safety" tools run *after* the model has acted — toxicity filters, output classifiers, post-hoc audit logs. By the time the alarm fires, the agent has already sent the email, merged the PR, or executed the trade.

Proof Layer flips this:

Agent proposes an action (e.g. *"send wire transfer for $50,000"*)
Proof Layer evaluates → returns signed verdict: EXECUTE / BLOCK / REVIEW / SHADOW
Receipt is written to a hash-chained, Ed25519-signed audit trail
Anyone with our public key can verify the entire chain offline — no trust in our infra required

A broken hash chain = tampering, immediately visible. A missing receipt = the agent acted without permission.

Verifying receipts offline

Receipts are designed to outlive us. Here's how to verify a bundle without ever calling our API:

import { verifyBundle } from "@proof-layer/verify";

import fs from "fs";

const bundle = fs.readFileSync("./receipts.ndjson", "utf8"); const publicKey = fs.readFileSync("./prooflayer-public-key.pem", "utf8");

const result = verifyBundle(bundle, publicKey); console.log(result); // { pass: 147, fail: 0, total: 147, chainBroken: false }

Public key is published at prooflayer.world999labs.com/v1/public-key and rotates on a published schedule.

Resources

🌐 Homepage: https://prooflayer.world999labs.com
🎬 Live demo (no signup): https://prooflayer.world999labs.com/demo
📖 MCP docs: packages/mcp/README.md
🔒 Privacy policy: PRIVACY.md
🐛 Report issues: GitHub Issues
💬 Support: support@world999labs.com

License

MIT — see LICENSE.

The kernel and dashboard are proprietary and not included in this repo. The MCP server, verifier, and all client SDKs published under @proof-layer/* (and the legacy @veridocs/* names) are MIT-licensed.

Contributing

Pull requests, issues, and feedback welcome. See CONTRIBUTING.md.

Proof Layer

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

MCP Server Autocad Lisp Helper

README from the maker

Proof Layer

What this repo contains

Quick start

Why pre-execution governance?

Verifying receipts offline

Resources

License

Contributing