MCP server · Finance and crypto

Tersign MCP server

Your AI can sign, verify and dispute receipts for agent payments, with tamper-proof evidence.

Tersign is a service that keeps a signed, tamper-proof record of deals made between AI agents. This MCP server lets your AI create and check those records for you. It is handy if you run an AI agent that pays or gets paid, or if you ever need proof of what was agreed.

What is an MCP server? The 30-second version

On its own, your AI can only chat. An MCP server is a small helper program that gives your AI a new skill or a connection to an app or service. This one connects your AI to Tersign, a service that stores signed receipts and evidence. Once connected, your AI can create, verify and dispute those records for you when you ask.

What this MCP server does

You ask your AI to do something, like issue a receipt or check one. The AI passes your request to this helper program. The helper talks to the Tersign service and signs the record with a key on your machine. Tersign counter-signs it and adds it to a chain of records. You get back a short answer, a digest (a long code that identifies the record) and a verdict.

Flow diagram: you ask your AI “Issue a receipt for this payment”, the Tersign MCP server connects it to Tersign, and you get back A short answer and a digest.

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What you can do with it

Issue a signed receipt for a payment or deal
Verify a receipt or digest you already have
Record a disclosure that your AI told someone it was an AI
Record a refund linked to an earlier receipt
Open a dispute and attach evidence to it
Check the status of a dispute
Verify a compliance record

Try asking your AI

“Issue a receipt for this payment and give me the digest”
“Verify this receipt file and tell me if the signature is valid”
“Record that my agent disclosed it was an AI in this chat”
“Open a dispute on this receipt with reason code wrong_item”

What it gives back to you

You get back short answers in the chat. For a receipt, you get a digest (a long code) and a confirmation that it was signed and chained. For a verification, you get a verdict like VALID or INVALID and a note about what was checked. For a dispute, you get its status and any evidence attached.

Before you start

What you need

Node.js 18 or newer
No account needed for basic use. A free signer key is created on your machine the first time.

Good to know

The server signs records with a key on your machine and can send them to the Tersign service, so only use it if you are comfortable with that. Some tools need extra settings and may not work without them.

Install it with your AI

Add Tersign MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check Tersign MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.