# @violetclaire/popcorn-mcp

Signed time and SHA-256 witness receipts for agents, with offline verification and x402 payment.

- **Type:** MCP server
- **Trust:** 60/100 (B), scored on the package rubric
- **Verification:** community-indexed — nobody has claimed this listing
- **Version:** 0.1.3
- **Author:** io.github.violetclaire
- **License:** MIT
- **npm:** @violetclaire/popcorn-mcp
- **Source:** https://github.com/violetclaire/popcorn-temporal-anchor
- **Compatible clients:** claude-code, cursor, copilot, gemini (basis: transport)

## Trust

60/100 (B), scored on the package rubric
- Publisher verified: no
- Install scripts: nothing suspicious found
- Prompt-injection scan: not run
- Obfuscation scan: not run
- Evidence age: 27 days

## Security scan

- **Status:** clean
- **Scanned:** 2026-09-07T19:55:52.764Z
- **Version scanned:** 0.1.1
- **CVEs:** none found by OSV at scan time

## Tools

5 declared. Statically extracted from the shipped source — a floor on the surface, not a census.
- `popcorn_catalog` — Fetch the live POPCORN service catalog, published verification keys, and public schemas. Free. Makes no payment.
- `popcorn_hash` — Compute SHA-256 locally over exact UTF-8 text or canonical unpadded base64url bytes. Free, local, and makes no network request or payment.
- `popcorn_verify` — Verify a POPCORN time or witness receipt locally against caller-supplied JWKS and expected values. Free and network-free. For chained witness receipts, verifica
- `popcorn_time` — Fetch signed time through x402. Defaults to a no-payment dry run that returns the 402 terms and exact request. A payment can occur only when approve_payment is 
- `popcorn_witness` — Witness a SHA-256 digest through x402. Defaults to a no-payment dry run that returns the 402 terms and exact request. A payment can occur only when approve_paym

## Install

**Verdict: review** — Installable, but 1 thing to check first: No publisher has proved control of this listing; it is indexed, not vouched for.
**Cautions** (coverage gaps and advisories — never blocking)
- No publisher has proved control of this listing; it is indexed, not vouched for.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"popcorn\": {\n      \"command\": \"npx\",\n      \"args\": [\n        \"-y\",\n        \"@violetclaire/popcorn-mcp\"\n      ],\n      \"env\": {\n        \"EVM_PRIVATE_KEY\": \"<YOUR_EVM_PRIVATE_KEY>\"\n      }\n    }\n  }\n}"
```
**Credentials it will ask for** (names only — Forge never holds a value):
- `EVM_PRIVATE_KEY` — Evm Private Key (optional)
Placeholders only. Forge never holds, brokers, or transmits a credential value — replace each <YOUR_NAME> in your own config file. Do not send a value back to Forge; no Forge endpoint accepts one.
- This entry needs 1 credential (0 required). The generated config carries placeholders, so it will fail in the editor rather than at runtime if they are left unset.

## Blast radius

Moderate blast radius — holds an api key; runs on your machine.
- Floor 22, ceiling 22 (tier: moderate)
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/%40violetclaire%2Fpopcorn-mcp
- Install plan: https://forgeregistry.com/api/v1/packages/%40violetclaire%2Fpopcorn-mcp/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/%40violetclaire%2Fpopcorn-mcp
- HTML page: https://forgeregistry.com/registry/%40violetclaire%2Fpopcorn-mcp
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.