KeyHalve - verify sealed documents

Name: KeyHalve - verify sealed documents
Author: keyhalve

by keyhalveversion 1.0.1i★ –iComputer or cloud

Registry namecom.keyhalve/verify

Install

Overview

Description from the maker (original English)

Free, no-account verification of KeyHalve-sealed documents. Read-only; never receives keys.

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: Computer or cloud
Transport: stdio, Streamable HTTP
Category: Other

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet
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 …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.keyhalve.com/mcp

Or run it on your computer

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

{
  "mcpServers": {
    "verify": {
      "command": "npx",
      "args": [
        "-y",
        "@keyhalve/verify-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add --transport http verify https://mcp.keyhalve.com/mcp

Or run it on your computer

claude mcp add verify -- npx -y @keyhalve/verify-mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "verify": {
      "url": "https://mcp.keyhalve.com/mcp"
    }
  }
}

Or run it on your computer

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "verify": {
      "command": "npx",
      "args": [
        "-y",
        "@keyhalve/verify-mcp"
      ]
    }
  }
}

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": {
    "verify": {
      "type": "http",
      "url": "https://mcp.keyhalve.com/mcp"
    }
  }
}

Or run it on your computer

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "verify": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@keyhalve/verify-mcp"
      ]
    }
  }
}

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.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.keyhalve.com/mcp

Menu names can differ slightly by plan and over time.

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

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

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain keyhalve.com (the registry checks domain ownership)
… 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 checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

More stars than 0% of the other 32417 servers in this category
Published to the registry more recently than 21% of the other 32417 servers in this category
Basic checks equal to or better than 100% of the other 32417 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 KeyHalve - verify sealed documents 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

Either way works: install it on your computer or connect to the cloud version.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.1) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, FOGA node

Alternatives

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A Finch OG Agent cell as an MCP server: read the world, dry-run and take ERC-8414 tenders by policy.

Computer or cloudUpdated today

Install

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.

KeyHalve verify-MCP

Free, public, no-account MCP server that lets any AI verify KeyHalve-sealed documents — from any platform on the rail (ValidPay, CheckBooks, …). *Seal = the door (a platform's paid MCP). Verify = the room (this one, free forever).*

Endpoint: https://mcp.keyhalve.com/mcp (Streamable HTTP, stateless)
Tools: keyhalve_verify · keyhalve_status · keyhalve_explain — all read-only, no auth

The blindness rule

This server never receives decryption keys. A verify URL carries the holder's key share in the #key= fragment; parseInput discards any fragment before any other logic runs, and the response says so. Verification here covers everything provable *without* the key:

Check	Meaning
status	active / revoked (with reason) on the issuing platform
ciphertext integrity	SHA-256 of the served ciphertext = commitment recorded at issuance (v2)
rail attestation	Ed25519-verified against the pinned rail key; dual-sign content binding when present
time lock	validity window judged client-side (Patent D semantics)
issuer trust	fail-closed: `declared` at best, never proof

Reading the sealed contents still happens only in the holder's browser — exactly like the web verifier. The overall verdict fails closed: any failed check → FAILED — DO NOT TRUST.

Design notes

Zero runtime dependencies. WebCrypto only; the whole protocol layer is hand-auditable. Same reasoning as the pinned-key rail client in keyhalve-website.
Stateless. No sessions, no SSE, no KV, no cookies; every POST gets application/json. Request bodies are never logged.
Tenant-neutral. Platforms come from the same manifest data as the web verifier (TENANT_MANIFEST in src/verifier.ts); onboarding a platform = one data entry.
Fail closed. Unreachable rail, malformed share, partial dual-sign binding, unknown id prefix — all report NOT verified, never a soft pass.

Develop / deploy

npm ci

npm run typecheck && npm test # 32 tests npm run dev # wrangler dev

Deploys are manual (deploy.yml via workflow_dispatch, same discipline as rail/console). Needs the CLOUDFLARE_API_TOKEN repo secret; the route mcp.keyhalve.com is a custom domain on the business CF account (same account as the watchdog scheduler).

Directory submissions (Mike-gated)

Submitting to the Claude Connectors Directory / ChatGPT App Directory is an outward-facing step — prepared separately, goes out only on Mike's go.

Listings

Directory-listing assets live in this repo — reuse them, don't invent copy:

llms-install.md — AI-agent install steps (Cline's AI-driven install; also the canonical per-client snippets).
glama.json — Glama claim file (maintainers; their live schema is maintainers-only).
assets/icon-400.png — 400×400 icon (white split-circle glyph on Ink #0E1116, from the brand kit).
Descriptions must stay byte-consistent with src/tools.ts and pass the approved-claims register (no "split key", no "tamper-proof", no issuer-identity claims).

KeyHalve - verify sealed documents

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Or run it on your computer

Or run it on your computer

Or run it on your computer

Or run it on your computer

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

FOGA node

README from the maker

KeyHalve verify-MCP

The blindness rule

Design notes

Develop / deploy

Directory submissions (Mike-gated)

Listings