Tersign Evidence MCP Server

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
secret
Optional: your own 0x-prefixed signing key. Unset or empty, the server uses the key in the macOS keychain (tersign-signer) or ~/.tersign/signer.key, and generates one there on first run. The key never leaves your machine. If your ledger account has a registered signing key, set that key here: the ledger rejects respondent dispute evidence signed by any other key.
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
Ledger base URL (optional). Needed by the dispute tools, and with the API key and seller id by record_refund and chained issue_receipt; record_disclosure defaults to https://tersign.ai
TERSIGN_LEDGER_API_KEY
secret
Ledger seller API key (optional). With TERSIGN_LEDGER_URL and TERSIGN_LEDGER_SELLER_ID it enables record_refund and chained issue_receipt; with TERSIGN_LEDGER_URL it authenticates respondent dispute evidence. record_disclosure needs no API key.
TERSIGN_LEDGER_SELLER_ID
Ledger seller id (optional). With TERSIGN_LEDGER_URL and TERSIGN_LEDGER_API_KEY it enables record_refund and chained issue_receipt.

~/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>"
      }
    }
  }
}

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