Koskamo

POPCORN MCP

A local stdio MCP server that provides signed temporal evidence for AI agents, enabling trusted timestamping and proof-of-existence verification. It allows agents to verify signed receipts against independent witnesses, gate state based on witness intervals, and collaborate with history tracking without storing private task state.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

POPCORN MCP logo, by violetclaireCommunity listingLocal stdioSource reviewed; not executedPublished by violetclaire
Vendor documentation

What you can do with it

  • Verify a signed receipt from an AI agent using a free read-only verifier
  • Gate agent state by comparing verified witness intervals with schedule windows
  • Query issuance metadata for collaboration history and certification status
  • Produce portable public historical packets for offline verification handoffs

Source and maintenance

Community listingRegistry 0.1.6
mcp-registry: io.github.violetclaire/popcorn-mcp@0.1.6Source repositoryProject website
Last repository push
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@violetclaire/popcorn-mcp 0.1.4

npmnpx
@violetclaire/popcorn-mcp package definition
{
  "version": "0.1.4",
  "transport": "stdio",
  "identifier": "@violetclaire/popcorn-mcp",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "EVM_PRIVATE_KEY",
      "format": "string",
      "description": "Optional dedicated Base payer key. Required only for a paid tool call that explicitly sets approve_payment to true."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "popcorn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@violetclaire/popcorn-mcp@0.1.4"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "popcorn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@violetclaire/popcorn-mcp@0.1.4"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "popcorn-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@violetclaire/popcorn-mcp@0.1.4"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "popcorn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@violetclaire/popcorn-mcp@0.1.4"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

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