Touchstone

Name: Touchstone
Author: Touchstone-CV

by Touchstone-CVversion 1.1.0i★ 0iComputer or cloud

Registry namecv.touchstone/touchstone

How to install

What it does

Bitcoin-anchored, tamper-evident audit log for AI agents — record, disclose and verify actions.

Connects Computer or cloud
Account or key Cloud: Needs Authorization · Local: Needs TOUCHSTONE_RECORDER, TOUCHSTONE_SUBJECT, TOUCHSTONE_API_KEY, TOUCHSTONE_SIGNING_KEY
Category Crypto & blockchain

Install

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

Passed 5/5 checks · What you ask goes through the maker’s server (touchstone.cv)

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 5 min

You need a Touchstone key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

Sign up and create a Touchstone key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open Claude’s Connectors page
CustomizeConnectors
Done
Click “+ Add” → “Add custom connector” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameTouchstone
Remote MCP server URL · Addresshttps://touchstone.cv/mcp
Under Request headers, add this name and value
Header nameAuthorization
ValueBearer <paste your key here>
Paste the key only into the app’s field, never into a chat or to anyone
Leave Authentication as Claude detected it, then click Add
Done
Turn it on in a chat
+ConnectorsTouchstone
Done
Try it
Use Touchstone and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Touchstone or shows a Touchstone tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Touchstone yet

Touchstone needs your own key to connect, but OpenAI’s help page only describes OAuth sign-in; there is no key option we could verify

What you can do instead

A · Use an app that can connect Touchstone

Steps for Claude →You need a Touchstone key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it
Steps for Claude Code →You need a Touchstone key (create it on the maker’s site)
Steps for Cursor →You need a Touchstone key (create it on the maker’s site)
Steps for VS Code →You need a Touchstone key (create it on the maker’s site)

B · Others in Crypto & blockchain that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Solana MCP by Vybe✓ ChatGPT
0xinsider✓ ChatGPT
Highwire✓ ChatGPT

Works with Claude Code · about 5 min

You need a Touchstone key (create it on the maker’s site)

Sign up and create a Touchstone key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
3
Paste this command and press Enter
```
claude mcp add --transport http --scope user touchstone https://touchstone.cv/mcp --header 'Authorization: Bearer your-value'
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see Touchstone listed as connected
Done
Try it
Use Touchstone and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Touchstone or shows a Touchstone tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 5 min

You need a Touchstone key (create it on the maker’s site)

Sign up and create a Touchstone key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the Touchstone settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Touchstone and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Touchstone or shows a Touchstone tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 5 min

You need a Touchstone key (create it on the maker’s site)

Sign up and create a Touchstone key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the Touchstone settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Touchstone and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Touchstone or shows a Touchstone tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://touchstone.cv/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use Touchstone💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http --scope user touchstone https://touchstone.cv/mcp --header 'Authorization: Bearer your-value'

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "touchstone": {
      "url": "https://touchstone.cv/mcp",
      "headers": {
        "Authorization": "Bearer your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "touchstone": {
      "type": "http",
      "url": "https://touchstone.cv/mcp",
      "headers": {
        "Authorization": "Bearer your-value"
      }
    }
  }
}

Installed on your computer

Claude Code

claude mcp add --scope user touchstone --env TOUCHSTONE_RECORDER=your-value --env TOUCHSTONE_SUBJECT=your-value --env TOUCHSTONE_API_KEY=your-value --env TOUCHSTONE_SIGNING_KEY=your-value --env TOUCHSTONE_KEY_FILE=your-value --env TOUCHSTONE_BASE_URL=your-value -- npx -y @touchstone-cv/mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "touchstone": {
      "command": "npx",
      "args": [
        "-y",
        "@touchstone-cv/mcp"
      ],
      "env": {
        "TOUCHSTONE_RECORDER": "your-value",
        "TOUCHSTONE_SUBJECT": "your-value",
        "TOUCHSTONE_API_KEY": "your-value",
        "TOUCHSTONE_SIGNING_KEY": "your-value",
        "TOUCHSTONE_KEY_FILE": "your-value",
        "TOUCHSTONE_BASE_URL": "your-value"
      }
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "touchstone": {
      "command": "npx",
      "args": [
        "-y",
        "@touchstone-cv/mcp"
      ],
      "env": {
        "TOUCHSTONE_RECORDER": "your-value",
        "TOUCHSTONE_SUBJECT": "your-value",
        "TOUCHSTONE_API_KEY": "your-value",
        "TOUCHSTONE_SIGNING_KEY": "your-value",
        "TOUCHSTONE_KEY_FILE": "your-value",
        "TOUCHSTONE_BASE_URL": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "touchstone": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@touchstone-cv/mcp"
      ],
      "env": {
        "TOUCHSTONE_RECORDER": "your-value",
        "TOUCHSTONE_SUBJECT": "your-value",
        "TOUCHSTONE_API_KEY": "your-value",
        "TOUCHSTONE_SIGNING_KEY": "your-value",
        "TOUCHSTONE_KEY_FILE": "your-value",
        "TOUCHSTONE_BASE_URL": "your-value"
      }
    }
  }
}

Values you fill in

TOUCHSTONE_RECORDER required env
Recorder public id (rec_...) to append to.
TOUCHSTONE_SUBJECT required env
The subject Colony sub whose key signs entries.
TOUCHSTONE_API_KEY secret required env
Touchstone API key (tsk_...) for the append/disclose REST calls.
TOUCHSTONE_SIGNING_KEY secret env
Base64 Ed25519 seed. Signs locally — the key never leaves your machine. Use this or TOUCHSTONE_KEY_FILE.
TOUCHSTONE_KEY_FILE env
Path to a file holding the base64 Ed25519 seed (alternative to TOUCHSTONE_SIGNING_KEY).
TOUCHSTONE_BASE_URL env
Override the Touchstone API base URL (defaults to https://touchstone.cv).
Authorization secret required HTTP header
A Touchstone API key as 'Bearer tsk_...' — an agent mints one with its own Colony identity (no browser); see https://touchstone.cv/developers

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

At a glance

GitHub stars i: 0
Downloads per weeki: 56/wk
Verified domain: ✓ touchstone.cv
Licence i: Apache-2.0
Connection: Computer or cloud
Transport: stdio, streamable-http
Latest versioni: 1.1.0
Categoryi: Crypto & blockchain
Published to registryi: Jul 10, 2026
Code last changedi: Sep 3, 2026
Maker: Touchstone-CV
Packages: npm: @touchstone-cv/mcp
Repo: Touchstone-CV/touchstone-mcp
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

Run on your computer in

All apps, with pros and cons →

What it can do

The server asks you to sign in before it lists its tools.

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 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain touchstone.cv (the registry checks domain ownership)
✓ Pass
Still maintained
Code last changed 2 months ago
✓ Pass
Has a licence
Uses Apache-2.0
✓ Pass
Endpoint responds
Responded in 326 ms (HTTP 401)
✓ Pass
Sign-in with OAuth
Declares OAuth sign-in, so your AI app can take you to log in
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1663 servers in this category
Published to the registry more recently than 26% of the other 1663 servers in this category
Basic checks equal to or better than 100% of the other 1663 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 Touchstone safe?

It passed 5 of 5 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: Authorization, TOUCHSTONE_RECORDER, TOUCHSTONE_SUBJECT, TOUCHSTONE_API_KEY, TOUCHSTONE_SIGNING_KEY

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 2 months ago, and the latest version (1.1.0) reached the registry 4 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 Business and above.

What can I use instead?

In the same category: Solana MCP by Vybe, Oracle3 prediction-market arbitrage checks, Polymarket Paper Trader

Others in the same category

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Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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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.

touchstone-mcp

Local MCP server for [Touchstone](https://touchstone.cv) — record what your agent did into a tamper-evident, externally-anchored log.

This server runs on your machine and holds your Ed25519 signing key. It signs each event locally and appends it to your recorder, so an agent only has to call touchstone_record({ event_type, payload }). The key never leaves this process. Canonicalization (JCS / RFC 8785) is done locally too, so a malicious or compromised server can't trick you into signing a different commitment than you intended.

Zero dependencies — Node 18+ built-ins only. It's a single file: read it before you trust it.

The remote MCP at https://touchstone.cv/mcp can't sign for you (Touchstone never holds your

key), so its touchstone_record expects a signature you computed yourself. Run this server

when you want frictionless local signing.

Install

# one-off, no install:

npx -y @touchstone-cv/mcp

or vendor the single file:

curl -O https://touchstone.cv/touchstone-mcp.mjs

or clone:

git clone https://github.com/Touchstone-CV/touchstone-mcp && cd touchstone-mcp

Configure

Point your MCP client at it over stdio:

"mcpServers": { "touchstone": { "command": "npx", "args": ["-y", "@touchstone-cv/mcp"], "env": { "TOUCHSTONE_RECORDER": "rec_...", "TOUCHSTONE_SUBJECT": " ", "TOUCHSTONE_API_KEY": "tsk_...", "TOUCHSTONE_SIGNING_KEY": " " } } } }

Env var	Required	Meaning
`TOUCHSTONE_RECORDER`	yes	Your recorder public id (`rec_…`)
`TOUCHSTONE_SUBJECT`	to record	Your Colony `sub` — the recorder's subject
`TOUCHSTONE_API_KEY`	yes	API key minted on the recorder (`tsk_…`)
`TOUCHSTONE_SIGNING_KEY`	to record	base64 Ed25519 32-byte seed — kept by you, never sent
`TOUCHSTONE_KEY_FILE`	alt	Path to JSON `{"seed_b64":"…"}` instead of the inline seed
`TOUCHSTONE_BASE_URL`	no	Defaults to `https://touchstone.cv`

To get a recorder + key, see [touchstone.cv/developers](https://touchstone.cv/developers) — agents can self-provision one with their own Colony token (OAuth Token Exchange, RFC 8693), no browser required.

Tools

Tool	What it does
`touchstone_record`	JCS-canonicalizes `payload`, signs the commitment locally, appends the entry
`touchstone_disclose`	Create a shareable `/d/` disclosure link (proxies to the service)
`touchstone_verify`	Verify a disclosure bundle (proxies to the service)
`touchstone_recorder_info`	Fetch your recorder's public info / checkpoint state

Only touchstone_record uses your signing key; the rest proxy to the remote service over your API key.

Selective field disclosure

Call touchstone_record({ event_type, payload, selective_disclosure: true }) to commit each payload field separately — the client computes a salted-field Merkle root locally and signs *that* as payload_hash, storing the per-field salts. Later you can reveal only a subset:

touchstone_disclose({ seqs: [n], reveal: { n: ["field_a", "field_b"] } })

Revealed fields ship with Merkle proofs against payload_hash (which your signature already covers); withheld fields are salt-bound and their values never appear in the disclosure. The root computation matches the server and the verifiers byte-for-byte.

Verifying the log

A disclosure can be checked by anyone, with no trust in Touchstone — in the browser verifier, the standalone verify.php, or the gossip_check.py split-view checker. Those tools are served from the site (and are each a single auditable file); this repo is just the recording client.

License

Apache-2.0.

Touchstone

What it does

Install

Sign up and create a Touchstone key

Open Claude’s Connectors page

Click “+ Add” → “Add custom connector” and fill in these 2 fields

Turn it on in a chat

Try it

What you can do instead

Sign up and create a Touchstone key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Sign up and create a Touchstone key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Sign up and create a Touchstone key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Over the web

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

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

Discussion

User reviews

Compared with others in Crypto & blockchaini

Common questions

Others in the same category

Solana MCP by Vybe

Oracle3 prediction-market arbitrage checks

Polymarket Paper Trader

README from the maker

touchstone-mcp

Install

or vendor the single file:

or clone:

Configure

Tools

Selective field disclosure

Verifying the log

License