# Sign and register statements on a Forestrie log

Sign data and record it in a Forestrie log, then check and verify the receipt. The server can also issue child grants and handle their x402 payment within configured caps.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: forestrie
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/forestrie/mcp-register
- Updated: 2026-10-20
- HTML: https://affpapa.org/en/nevibecode/mcp/sign-and-register-statements-on-a-forestrie-log

## What it does

The MCP server signs supplied data with a log key and registers it in a Forestrie transparency log. An agent can check the registration state, wait for sealing, save the receipt, and verify it against the data. The server keeps the signing keys; the model supplies payloads rather than key material or signatures.

A separate workflow issues a child grant and registers it with canopy. Payment can go through x402 within configured caps, or stay with the requester: without a payer configured, the server returns the payment requirements and resumes when the requester supplies payment. Setup requires `FORESTRIE_GRANT` and `FORESTRIE_AUTHORITY_GRANT`; registering a grant also uses the authority log’s grant. Payloads can be base64 or a file path, with an explicit content type and a limit of 4 MiB.

## Requirements
- Needs: Node.js (commands run via npx)
- Environment variables: `FORESTRIE_BASE_URL`, `FORESTRIE_ROOT_LOG_ID`, `FORESTRIE_GRANT`, `FORESTRIE_AUTHORITY_GRANT`, `FORESTRIE_COORDINATOR_URL`, `FORESTRIE_KNOWN_SEALER_KEY`, `MCP_REGISTER_HOME`, `MCP_REGISTER_KEY_FILE`, `MCP_REGISTER_AUTHORITY_KEY_FILE`, `MCP_REGISTER_PAYER_KEY_FILE` — keys and tokens: ask the human for the values, never commit them or put them in shared files.

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add --env FORESTRIE_BASE_URL=<FORESTRIE_BASE_URL> --env FORESTRIE_ROOT_LOG_ID=<FORESTRIE_ROOT_LOG_ID> --env FORESTRIE_GRANT=<FORESTRIE_GRANT> --env FORESTRIE_AUTHORITY_GRANT=<FORESTRIE_AUTHORITY_GRANT> --env FORESTRIE_COORDINATOR_URL=<FORESTRIE_COORDINATOR_URL> --transport stdio sign-and-register-statements-on-a-forestrie-log -- npx -y @forestrie/mcp-register
```
Replace <…> with your own values. 11 more environment variables are in the server README

### Codex

**Platform CLI**
```bash
codex mcp add sign-and-register-statements-on-a-forestrie-log --env FORESTRIE_BASE_URL=<FORESTRIE_BASE_URL> --env FORESTRIE_ROOT_LOG_ID=<FORESTRIE_ROOT_LOG_ID> --env FORESTRIE_GRANT=<FORESTRIE_GRANT> --env FORESTRIE_AUTHORITY_GRANT=<FORESTRIE_AUTHORITY_GRANT> --env FORESTRIE_COORDINATOR_URL=<FORESTRIE_COORDINATOR_URL> -- npx -y @forestrie/mcp-register
```
Replace <…> with your own values. 11 more environment variables are in the server README

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "sign-and-register-statements-on-a-forestrie-log": {
            "command": "npx",
            "args": [
                "-y",
                "@forestrie/mcp-register"
            ],
            "env": {
                "FORESTRIE_BASE_URL": "<FORESTRIE_BASE_URL>",
                "FORESTRIE_ROOT_LOG_ID": "<FORESTRIE_ROOT_LOG_ID>",
                "FORESTRIE_GRANT": "<FORESTRIE_GRANT>",
                "FORESTRIE_AUTHORITY_GRANT": "<FORESTRIE_AUTHORITY_GRANT>",
                "FORESTRIE_COORDINATOR_URL": "<FORESTRIE_COORDINATOR_URL>"
            }
        }
    }
}
```
Replace <…> with your own values. 11 more environment variables are in the server README

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "sign-and-register-statements-on-a-forestrie-log": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "@forestrie/mcp-register"
            ],
            "env": {
                "FORESTRIE_BASE_URL": "<FORESTRIE_BASE_URL>",
                "FORESTRIE_ROOT_LOG_ID": "<FORESTRIE_ROOT_LOG_ID>",
                "FORESTRIE_GRANT": "<FORESTRIE_GRANT>",
                "FORESTRIE_AUTHORITY_GRANT": "<FORESTRIE_AUTHORITY_GRANT>",
                "FORESTRIE_COORDINATOR_URL": "<FORESTRIE_COORDINATOR_URL>"
            }
        }
    }
}
```
Replace <…> with your own values. 11 more environment variables are in the server README

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add -e FORESTRIE_BASE_URL=<FORESTRIE_BASE_URL> -e FORESTRIE_ROOT_LOG_ID=<FORESTRIE_ROOT_LOG_ID> -e FORESTRIE_GRANT=<FORESTRIE_GRANT> -e FORESTRIE_AUTHORITY_GRANT=<FORESTRIE_AUTHORITY_GRANT> -e FORESTRIE_COORDINATOR_URL=<FORESTRIE_COORDINATOR_URL> sign-and-register-statements-on-a-forestrie-log npx -y @forestrie/mcp-register
```
Replace <…> with your own values. 11 more environment variables are in the server README

## When to use it
- sign data and record it in a Forestrie log
- check registration status and save the receipt
- verify a receipt against its statement
- issue a child grant for a data log
- pay to register a grant within configured caps

## Example prompts
- Sign this file and register it in the Forestrie log.
- Check the registration state, then verify the receipt against the original data.
- Issue a child grant for a data log and register it with payment within the configured caps.

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