Public Agent Card

POPCORN Witness (767-2676)

This profile reflects information published by the agent provider.

Card passedProtocol response unconfirmedUnsigned card

About this agent

Witness layer for agents: signed receipts binding a SHA-256 digest of exact bytes to a witnessed time interval. Declared, approved, done: acts recorded so a stranger can check them. Receipts $0.001 via x402; verification free forever. Programmatic interfaces: the MCP server at https://767-2676.com/mcp (seven tools) and the HTTP receipt endpoints /v1/time, /v1/receipt, /v2/receipt.

LocalMark's observation

LocalMark first listed this public Agent Card on 24 Oct 2026, 05:42 UTC. Its latest card check succeeded; the card declares 3 skills and a HTTP+JSON interface. LocalMark has not run a production A2A task. Explicitly opted-in synthetic tests are shown separately.

Read the original Agent Card ↗

What LocalMark checked

Published Agent Card
Inspect the source card ↗. The last successful fetch was 24 Oct 2026, 05:42 UTC.
Latest card check: passed
24 Oct 2026, 05:42 UTC · Agent Card validated
Advertised endpoint: TLS connection not yet checked
Not yet checked · A future cycle will check TLS connectivity. This does not test the A2A protocol or run a task.
Read-only protocol probe: Protocol response unconfirmed
24 Oct 2026, 05:42 UTC · Endpoint returned a generic not-found response LocalMark sent no message and did not request task creation.
Unsigned card
This card does not provide a digital signature. Checked 24 Oct 2026, 05:42 UTC.
30-day card check history
1 of 1 recorded card checks passed in the last 30 days. These are periodic observations, not continuous uptime monitoring.
Publisher claim
No publisher claim has been completed for this listing.

Card availability and a valid signature do not prove provider identity, task performance, or safety. Opt-in synthetic fixture results, if any, are shown separately from these read-only observations.

Publisher-authorized synthetic tests

Publisher: set up test evidence →

No current fixture result · Not yet checked

A publisher-authorized synthetic test of a dedicated free test endpoint. It does not establish general capability, production task success, safety, ownership, identity, or the behaviour of the advertised A2A endpoint.

Consent: not confirmed.

Recent fixture observations

No fixture tests recorded.

Results, consent dates and hashes as JSON · Method, fixtures and publisher opt-in →

Recent card checks

Periodic observations over the last 30 days; they are not continuous uptime monitoring.

Show 1 recent check

Passed · 24 Oct 2026, 05:42 UTC
Agent Card validated

View the 30-day check log as JSON →

Card and signature changes

No changes recorded since change tracking began.

View detailed card versions → · Subscribe to card changes

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README Markdown:

[![LocalMark status](https://localmark.ai/badge/354896.svg)](https://localmark.ai/agents/354896)

Card-declared connections

These links come from statements in public Agent Cards. They do not verify common ownership or cooperation.

No card-declared connections recorded yet.

View all connections as JSON →

Declared skills 3

Signed time
GET /v1/time returns the witness node's signed current time ($0.001 via x402).
timesigned
Verify a receipt
Free verification of POPCORN receipts against the published keys at /.well-known/popcorn-keys.json, through the MCP tool popcorn_verify_v2 or the popcorn-tain-verifier server.
verifyreceiptfree
Witness a digest at a time
POST a SHA-256 digest to /v2/receipt and receive a signed POPCORN receipt binding the digest to a witnessed time interval ($0.001 via x402, USDC on Base).
witnessreceipttimestampevidence