Time-Gated Verification

# Time-Gated Verification

Layer: Research
Status: Exploratory
Audience: Researchers, SDK architects, security reviewers

Executive Summary

Time-gated verification explores whether event acceptance can be bounded by deterministic windows.

The goal is to reduce replay ambiguity and improve evidence ordering.

This document is exploratory and does not replace cryptographic authentication.

Basic Model

An event is accepted only if it satisfies:

* valid canonical encoding
* valid event hash
* acceptable time window
* non-duplicate nonce
* witness quorum rules

If the event arrives outside the window, it is rejected or marked stale.

Why Time Gates Matter

Integrity alone is incomplete.

A perfectly valid old event can still be a replay attack.

Time gates add freshness and ordering discipline.

Window Record

Each verification window should record:

window_id: <uuid>
window_start: <UTC>
window_end: <UTC>
member_set_hash: <hash>
quorum_policy: <policy>
head_hash: <hash>
accepted_events: <n>
refused_events: <n>

Refusal Conditions

An event may be refused if:

* it is outside the accepted window
* it duplicates a prior nonce
* its canonical encoding fails
* its hash does not match
* required witness quorum is unavailable

Caution

Clock synchronization is not truth.

Time gates improve ordering, but they do not prove physical origin by themselves.

They must be paired with signatures, Merkle proofs, witness diversity, and replay checks.

Final Principle

A time gate is not a wall.

It is a boundary condition.

It helps the system know when an event belongs.