All servers · Payments & accounting · Crypto & blockchain

POPCORN MCP

io.github.violetclaire/popcorn-mcp · v0.1.5

New (7 days)Has write/delete tools

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Has destructive tools (destructiveHint)
Capabilities declared	tools
Tool definitions	7 tools · with description 100% · input schema is an object 100% · read/destructive hints 100%

Description written by the publisher, not verified

RFC 3161 + authorization expiry: https://767-2676.com/prove-action-before-authorization-expired

Connect

streamable-http · https://767-2676.com/mcp

claude mcp add --transport http popcorn-mcp https://767-2676.com/mcp

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

Tools as reported by the server

popcorn_sample
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
Read the live catalog, offer, and published verification keys. Free; no payment.
popcorn_hash
Hash public bytes on this remote server. Submitted text reaches the server: hash private work locally instead. Free; no onward request or payment.
popcorn_verify
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.
popcorn_verify_v2
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.
popcorn_time write/delete
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 acc
popcorn_witness write/delete
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 d

Repository · Website · JSON · Text for agents · Registry updated 2026-10-24