Tersign Evidence MCP Server

Name: Tersign Evidence MCP Server
Author: io.github.tersignhq

io.github.tersignhq/evidence

Repository Registry

What is the Tersign Evidence MCP server?

Counter-signed evidence records for agent commerce: receipts, verification, dispute envelopes.

How to install Tersign Evidence

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

TERSIGN_SELLER_KEY
required
secret
0x-prefixed private key the seller signs receipts with
TERSIGN_ISSUER_NAME
Seller/issuer display name
TERSIGN_ISSUER_JURISDICTION
Seller jurisdiction (e.g. HK)
TERSIGN_ISSUER_TAX_ID
Seller tax/business-registration id (optional)
TERSIGN_LEDGER_URL
Hosted ledger base URL for counter-signing (optional; SDK works standalone)
TERSIGN_LEDGER_API_KEY
secret
Ledger seller API key (required only if counter-signing)
TERSIGN_LEDGER_SELLER_ID
Ledger seller id (required only if counter-signing)

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "evidence": {
      "command": "npx",
      "args": [
        "-y",
        "tersign"
      ],
      "env": {
        "TERSIGN_SELLER_KEY": "<YOUR_TERSIGN_SELLER_KEY>",
        "TERSIGN_ISSUER_NAME": "<YOUR_TERSIGN_ISSUER_NAME>",
        "TERSIGN_ISSUER_JURISDICTION": "<YOUR_TERSIGN_ISSUER_JURISDICTION>",
        "TERSIGN_ISSUER_TAX_ID": "<YOUR_TERSIGN_ISSUER_TAX_ID>",
        "TERSIGN_LEDGER_URL": "<YOUR_TERSIGN_LEDGER_URL>",
        "TERSIGN_LEDGER_API_KEY": "<YOUR_TERSIGN_LEDGER_API_KEY>",
        "TERSIGN_LEDGER_SELLER_ID": "<YOUR_TERSIGN_LEDGER_SELLER_ID>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "evidence": {
      "command": "npx",
      "args": [
        "-y",
        "tersign"
      ],
      "env": {
        "TERSIGN_SELLER_KEY": "<YOUR_TERSIGN_SELLER_KEY>",
        "TERSIGN_ISSUER_NAME": "<YOUR_TERSIGN_ISSUER_NAME>",
        "TERSIGN_ISSUER_JURISDICTION": "<YOUR_TERSIGN_ISSUER_JURISDICTION>",
        "TERSIGN_ISSUER_TAX_ID": "<YOUR_TERSIGN_ISSUER_TAX_ID>",
        "TERSIGN_LEDGER_URL": "<YOUR_TERSIGN_LEDGER_URL>",
        "TERSIGN_LEDGER_API_KEY": "<YOUR_TERSIGN_LEDGER_API_KEY>",
        "TERSIGN_LEDGER_SELLER_ID": "<YOUR_TERSIGN_LEDGER_SELLER_ID>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "evidence": {
      "command": "npx",
      "args": [
        "-y",
        "tersign"
      ],
      "env": {
        "TERSIGN_SELLER_KEY": "<YOUR_TERSIGN_SELLER_KEY>",
        "TERSIGN_ISSUER_NAME": "<YOUR_TERSIGN_ISSUER_NAME>",
        "TERSIGN_ISSUER_JURISDICTION": "<YOUR_TERSIGN_ISSUER_JURISDICTION>",
        "TERSIGN_ISSUER_TAX_ID": "<YOUR_TERSIGN_ISSUER_TAX_ID>",
        "TERSIGN_LEDGER_URL": "<YOUR_TERSIGN_LEDGER_URL>",
        "TERSIGN_LEDGER_API_KEY": "<YOUR_TERSIGN_LEDGER_API_KEY>",
        "TERSIGN_LEDGER_SELLER_ID": "<YOUR_TERSIGN_LEDGER_SELLER_ID>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "evidence": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "tersign"
      ],
      "env": {
        "TERSIGN_SELLER_KEY": "<YOUR_TERSIGN_SELLER_KEY>",
        "TERSIGN_ISSUER_NAME": "<YOUR_TERSIGN_ISSUER_NAME>",
        "TERSIGN_ISSUER_JURISDICTION": "<YOUR_TERSIGN_ISSUER_JURISDICTION>",
        "TERSIGN_ISSUER_TAX_ID": "<YOUR_TERSIGN_ISSUER_TAX_ID>",
        "TERSIGN_LEDGER_URL": "<YOUR_TERSIGN_LEDGER_URL>",
        "TERSIGN_LEDGER_API_KEY": "<YOUR_TERSIGN_LEDGER_API_KEY>",
        "TERSIGN_LEDGER_SELLER_ID": "<YOUR_TERSIGN_LEDGER_SELLER_ID>"
      }
    }
  }
}

Claude Code

claude mcp add evidence --env TERSIGN_SELLER_KEY=<YOUR_TERSIGN_SELLER_KEY> --env TERSIGN_ISSUER_NAME=<YOUR_TERSIGN_ISSUER_NAME> --env TERSIGN_ISSUER_JURISDICTION=<YOUR_TERSIGN_ISSUER_JURISDICTION> --env TERSIGN_ISSUER_TAX_ID=<YOUR_TERSIGN_ISSUER_TAX_ID> --env TERSIGN_LEDGER_URL=<YOUR_TERSIGN_LEDGER_URL> --env TERSIGN_LEDGER_API_KEY=<YOUR_TERSIGN_LEDGER_API_KEY> --env TERSIGN_LEDGER_SELLER_ID=<YOUR_TERSIGN_LEDGER_SELLER_ID> -- npx -y tersign