# Receipt — sign an agent's work, verify it offline (remote · receipt.whirlwindcorp.com)

Ed25519 receipts over work artifacts: issue and verify offline, no account, no chain, no network.

- Trust score: 62/100 (medium)
- Change this week: +44
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `receipt.whirlwindcorp.com`: 62/100 (this document), [markdown](https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt.md), [page](https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt)
- mcpb · `ggbank-receipt.mcpb`: 47/100, [markdown](https://verifymcp.io/servers/ecstatica-ggbank-receipt/ggbank-receipt.md), [page](https://verifymcp.io/servers/ecstatica-ggbank-receipt/ggbank-receipt)

## Channel facts

- Endpoint: `https://receipt.whirlwindcorp.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 75/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 296 tokens (~148/item across 2 items; 2 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Receipt — sign an agent's work, verify it offline MCP server?

Receipt — sign an agent's work, verify it offline is a hosted endpoint at https://receipt.whirlwindcorp.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http ecstatica-ggbank-receipt 'https://receipt.whirlwindcorp.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ecstatica-ggbank-receipt": {
      "url": "https://receipt.whirlwindcorp.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ecstatica-ggbank-receipt": {
      "type": "http",
      "url": "https://receipt.whirlwindcorp.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ecstatica-ggbank-receipt]
url = "https://receipt.whirlwindcorp.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ecstatica-ggbank-receipt": {
      "type": "remote",
      "url": "https://receipt.whirlwindcorp.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ecstatica-ggbank-receipt --url 'https://receipt.whirlwindcorp.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ecstatica-ggbank-receipt:
    url: "https://receipt.whirlwindcorp.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ecstatica-ggbank-receipt": {
      "Transport": "http",
      "Url": "https://receipt.whirlwindcorp.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ecstatica-ggbank-receipt -t streamable-http -u 'https://receipt.whirlwindcorp.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ecstatica-ggbank-receipt": {
      "type": "http",
      "url": "https://receipt.whirlwindcorp.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 61, +43)

- [security improvement] Injection markers: unverified → pass
- [security improvement] Transport: fail → pass
- [security] Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
- [functional improvement] Endpoint reachability: not serving MCP → reachable
- [functional improvement] Stability: unverified → 0.10
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Tool coverage: unverified → 100

### 2026-11-02 (score 18, −42)

- [security regression] Endpoint reachability: reachable → not serving MCP
- [security regression] Tool safety: pass → unverified
- [security regression] Stability: 0.03 → unverified
- [security regression] Transport: pass → fail
- [security] Authorization: Authorisation not yet verified: we couldn't confirm whether this endpoint requires it.
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified

### 2026-11-01 (score 60, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-31 (score 60, +42)

- [security improvement] Injection markers: unverified → pass
- [security improvement] Transport: fail → pass
- [security] First check of Judged manipulation: pass
- [security] Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Tool coverage: 100
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good
- [functional] First check of Schema quality: fail

### 2026-10-29 (score 18)

First indexed and scored.

## MCP tools (2)

### `issue_receipt` (~191 tokens)

Sign an artifact with an Ed25519 receipt. Returns the receipt JSON: artifact hash, agent, task, amount and a signature anyone can verify offline.

Input parameters:

- `agent` (string, required): agent identifier, e.g. VOID-9
- `amount_gg` (number): amount paid for the work
- `artifact_b64` (string): the delivered file's bytes, base64 — use this with a hosted endpoint
- `artifact_name` (string): optional filename recorded in the receipt
- `artifact_path` (string): path to the delivered file (local/stdio only; a hosted server refuses it)
- `artifact_text` (string): the delivered content as UTF-8 text, when it is text
- `key_path` (string): optional Ed25519 private key file (local/stdio only); a fresh key is used otherwise
- `task` (string, required): task or quest id

### `verify_receipt` (~105 tokens)

Verify a receipt offline: signature, every field, and optionally the artifact hash. Returns ok=false with the failing reason when anything has changed.

Input parameters:

- `artifact_b64` (string): the artifact's bytes, base64 — use this with a hosted endpoint
- `artifact_path` (string): optional file to hash-check (local/stdio only)
- `artifact_text` (string): the artifact as UTF-8 text
- `receipt` (object, required): the receipt object as issued

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt#diagnostics

## Score history

- 2026-11-05: 62
- 2026-11-04: 62
- 2026-11-03: 61
- 2026-11-02: 18
- 2026-11-01: 60
- 2026-10-31: 60
- 2026-10-30: 18
- 2026-10-29: 18

## Common questions

### What is the Receipt — sign an agent's work, verify it offline MCP server?

Receipt — sign an agent's work, verify it offline is an MCP server listed in the public MCP registry as io.github.ecstatica/ggbank-receipt. Ed25519 receipts over work artifacts: issue and verify offline, no account, no chain, no network. This page covers its hosted endpoint (https://receipt.whirlwindcorp.com/mcp).

### Is the Receipt — sign an agent's work, verify it offline MCP server safe to use?

Receipt — sign an agent's work, verify it offline scores 62 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Receipt — sign an agent's work, verify it offline MCP server expose?

Receipt — sign an agent's work, verify it offline exposes 2 tools: issue_receipt, verify_receipt. Their descriptions and schemas cost roughly 296 tokens of context every time the server is loaded.

### Does the Receipt — sign an agent's work, verify it offline MCP server require authentication?

No. We connected to Receipt — sign an agent's work, verify it offline without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Receipt — sign an agent's work, verify it offline MCP server still maintained?

Receipt — sign an agent's work, verify it offline is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://receipt.whirlwindcorp.com/mcp
- Repository: https://github.com/ecstatica/ggbank-receipt
- Changelog RSS feed: https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt.xml
- Changelog JSON feed: https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt.json
- HTML version of this page: https://verifymcp.io/servers/ecstatica-ggbank-receipt/receipt