# POPCORN MCP

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

Canonical: https://claudelist.com/listings/mcp-reg-io-github-violetclaire-popcorn-mcp-ff99fb722b

Category: MCP Servers

Source: community · violetclaire

Source checked: 2026-10-14

Website: https://www.claudemcp.org/mcp/registry/io-github-violetclaire-popcorn-mcp-ff99fb722b38.html

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

## Install or set up

1. Review the publisher repository and npm package `@violetclaire/popcorn-mcp@0.1.3` before running it. The MCP Registry declares this package as a stdio server.
2. Install Node.js, then run the command below in your Claude Code project. Check the publisher README for any account or configuration requirements.
3. Restart Claude Code and use `/mcp` to confirm the connection and review its tools and permissions.

```sh
claude mcp add mcp-io-github-violetclaire-popcorn-mcp-ff99fb -- npx -y @violetclaire/popcorn-mcp@0.1.3
```

Installation guide: https://github.com/violetclaire/popcorn-temporal-anchor