POPCORN MCP

Name: POPCORN MCP
Author: violetclaire

MCP serverMCP

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

by violetclairerepository ↗homepage ↗v0.1.5SEE LICENSE IN LICENSE

Observed by Wellknown

Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability26/26 checks ok

30 days agotoday

when	check	result	http	latency	detail
26 min ago	mcp initialize	ok	200	211 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
1 h ago	mcp initialize	ok	200	204 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
2 h ago	mcp initialize	ok	200	324 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
3 h ago	mcp initialize	ok	200	444 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
5 h ago	mcp initialize	ok	200	393 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
6 h ago	mcp initialize	ok	200	139 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
6 h ago	mcp initialize	ok	200	195 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
7 h ago	mcp initialize	ok	200	126 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
8 h ago	mcp initialize	ok	200	165 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools
10 h ago	mcp initialize	ok	200	142 ms	server popcorn 0.1.4-remote · protocol 2025-06-18 · 7 tools

Tools observed via MCP handshake

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 clo
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
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 dig
popcorn_time — 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 approva
popcorn_witness — 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; require

Declared by sources

What the publisher says

Attributed to the source that supplied each field. Treated as claims, not facts.

No long description beyond the summary.

mcpmcp-servermodel-context-protocolx402agentstimetimestamprfc3161opentimestampsproof-of-existenceauthorization-expiryattestationreceiptsbaseusdctrusted-timestampauthorization

kind Official MCP Registry

name Official MCP Registry

license npm registry

repoUrl Official MCP Registry

summary Official MCP Registry

version Official MCP Registry

description Official MCP Registry

homepageUrl Official MCP Registry

publisherName Official MCP Registry

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

npm registry@violetclaire/popcorn-mcp

first seen 2 mo ago · fetched 18 h agoopen ↗

Official MCP Registryio.github.violetclaire/popcorn-mcp

first seen 2 mo ago · fetched 29 h agoopen ↗

Field history (12 recent events)

18 h ago · observed · packageFacts → {"name":"@violetclaire/popcorn-mcp","registry":"npm","publishedAt":"2026-10-24T06:34:03.386Z","latestVersion":"0.1.4","w
26 h ago · claimed · ownership → {"method":"github_owner","target":"violetclaire"}
29 h ago · declared · description → "RFC 3161 + authorization expiry: https://767-2676.com/prove-action-before-authorization-expired"
29 h ago · declared · version → "0.1.5"
29 h ago · declared · summary → "RFC 3161 + authorization expiry: https://767-2676.com/prove-action-before-authorization-expired"
5 d ago · declared · summary → "MCP server for signed time and witness receipts. Prove when an agent action happened. Verify free."
5 d ago · declared · version → "0.1.4"
5 d ago · declared · description → "MCP server for signed time and witness receipts. Prove when an agent action happened. Verify free."
1 mo ago · declared · version → "0.1.3"
1 mo ago · observed · packageFacts → {"name":"@violetclaire/popcorn-mcp","registry":"npm","publishedAt":"2026-09-16T14:00:50.097Z","latestVersion":"0.1.3","w
1 mo ago · declared · license → "SEE LICENSE IN LICENSE"
2 mo ago · observed · packageFacts → {"name":"@violetclaire/popcorn-mcp","registry":"npm","publishedAt":"2026-09-10T17:07:06.426Z","latestVersion":"0.1.2","w

Evidence

What the publisher says

Capabilities

Where this record came from