# POPCORN MCP (remote · 767-2676.com)

Witness layer for agents: signed receipts binding a fingerprint to a witnessed time. $0.001.

- Trust score: 62/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `767-2676.com`: 62/100 (this document), [markdown](https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676.md), [page](https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676)
- npm · `@violetclaire/popcorn-mcp`: 73/100, [markdown](https://verifymcp.io/servers/violetclaire-popcorn-mcp/violetclaire-popcorn-mcp.md), [page](https://verifymcp.io/servers/violetclaire-popcorn-mcp/violetclaire-popcorn-mcp)

## Channel facts

- Endpoint: `https://767-2676.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.6`

## 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**: 49/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (popcorn_time).
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 404, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 63/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 620 tokens (~88/item across 7 items; 7 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 40/100
  - Stability observed for 12 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 70/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 10% 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 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the POPCORN MCP server?

POPCORN MCP is a hosted endpoint at https://767-2676.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 violetclaire-popcorn-mcp 'https://767-2676.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "violetclaire-popcorn-mcp": {
      "url": "https://767-2676.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "violetclaire-popcorn-mcp": {
      "type": "http",
      "url": "https://767-2676.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.violetclaire-popcorn-mcp]
url = "https://767-2676.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "violetclaire-popcorn-mcp": {
      "type": "remote",
      "url": "https://767-2676.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add violetclaire-popcorn-mcp --url 'https://767-2676.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  violetclaire-popcorn-mcp:
    url: "https://767-2676.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "violetclaire-popcorn-mcp": {
      "Transport": "http",
      "Url": "https://767-2676.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add violetclaire-popcorn-mcp -t streamable-http -u 'https://767-2676.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "violetclaire-popcorn-mcp": {
      "type": "http",
      "url": "https://767-2676.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 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 58, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 57, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-24 (score 57)

First indexed and scored.

## MCP tools (7)

### `popcorn_sample` (~58 tokens)

Verify a real receipt for free

Check the public October 14 TAIN 2.0 receipt and a changed-digest control. No inputs, wallet, payment, or outbound request. Historical evidence, not a fresh clock. Bundled sample keys do not independently establish issuer identity.

### `popcorn_catalog` (~25 tokens)

Read the live catalog, offer, and published verification keys. Free; no payment.

### `popcorn_hash` (~54 tokens)

Hash public bytes on this remote server. Submitted text reaches the server: hash private work locally instead. Free; no onward request or payment.

Input parameters:

- `payload_base64url` (string)
- `payload_text` (string)

### `popcorn_verify` (~81 tokens)

Verify a time or witness receipt using caller-trusted JWKS and expected values. Digest-only for witness payloads. No outbound request or payment. Caller keys do not establish issuer identity; a signature grants no authority.

Input parameters:

- `jwks` (object, required)
- `receipt_type` (string, required)
- `response` (object, required)
- `verification` (object, required)

### `popcorn_verify_v2` (~128 tokens)

Verify TAIN 2.0 evidence against keys fetched from the fixed POPCORN issuer URL. Caller jwks is replaced with published keys, including predecessors. Send a digest, never private work. Free; does not grant authority, establish current time, or verify settlement on chain.

Input parameters:

- `expected_node_id` (string)
- `expected_nonce` (string, required)
- `expected_payload_digest` (string, required)
- `jwks` (object, required)
- `max_clock_accuracy_radius_ms` (integer)
- `previous_receipt` (object)
- `response` (object, required)

### `popcorn_time` (~128 tokens)

Request signed current-time evidence. Defaults to a free unpaid 402 challenge. A fresh receipt costs exactly $0.001 USDC on Base. Payment requires owner approval, approve_payment:true, and a caller-signed payment_signature. No server wallet or private key. No automatic retry. Verify evidence and account for client round-trip time before a deadline decision.

Input parameters:

- `approve_payment` (boolean)
- `freshness_ms` (integer)
- `payment_signature` (string): Caller-signed x402 PAYMENT-SIGNATURE. Never send a wallet private key. Requires approve_payment:true for this single call.

### `popcorn_witness` (~146 tokens)

Witness a SHA-256 digest and fresh caller nonce at a time. Defaults to a free unpaid 402 challenge. One fresh receipt costs exactly $0.001 USDC on Base; requires owner approval, approve_payment:true, and caller-signed payment_signature. Keep work and wallet keys local. No automatic retry. Evidence does not authorize or prove execution of an action.

Input parameters:

- `approve_payment` (boolean)
- `digest` (string, required)
- `nonce` (string, required)
- `payment_signature` (string): Caller-signed x402 PAYMENT-SIGNATURE. Never send a wallet private key. Requires approve_payment:true for this single call.
- `previous_attestation_digest`

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676#diagnostics

## Score history

- 2026-11-05: 62
- 2026-11-04: 62
- 2026-11-03: 61
- 2026-11-02: 61
- 2026-11-01: 60
- 2026-10-31: 60
- 2026-10-30: 59
- 2026-10-29: 59
- 2026-10-28: 58
- 2026-10-27: 58
- 2026-10-26: 58
- 2026-10-25: 57
- 2026-10-24: 57

## Common questions

### What is the POPCORN MCP server?

POPCORN MCP is listed in the public MCP registry as io.github.violetclaire/popcorn-mcp. Witness layer for agents: signed receipts binding a fingerprint to a witnessed time. $0.001. This page covers its hosted endpoint (https://767-2676.com/mcp).

### Is the POPCORN MCP server safe to use?

POPCORN MCP 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 POPCORN MCP server expose?

POPCORN MCP exposes 7 tools: popcorn_sample, popcorn_catalog, popcorn_hash, popcorn_verify, popcorn_verify_v2, and 2 more. Their descriptions and schemas cost roughly 620 tokens of context every time the server is loaded.

### Does the POPCORN MCP server require authentication?

No. We connected to POPCORN MCP without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the POPCORN MCP server still maintained?

POPCORN MCP 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://767-2676.com/mcp
- Repository: https://github.com/violetclaire/popcorn-temporal-anchor
- Website: https://767-2676.com/agents
- Changelog RSS feed: https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676.xml
- Changelog JSON feed: https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676.json
- HTML version of this page: https://verifymcp.io/servers/violetclaire-popcorn-mcp/767-2676