Gate 15 Architectural Proof Summary

Caersyn Proof Study

System: Caersyn Trace

Milestone: Gate 15

Proof status: REPRESENTED

Suite mode: stage1

Customer namespace: caersyn

Version: v0.2

Date: June 2026

Evidence Report for Caersyn Trace

Gate 15 provides a focused architectural proof layer for Caersyn Trace.

Its purpose is not to replace the full Trace test baseline. Its purpose is to show that the most important proof surfaces of the Trace evidence architecture are represented by explicit tests and supporting execution records.

Gate 15 supports the claim that Caersyn Trace is more than an event recorder or internal log store. It shows that Trace has a proof model across five critical surfaces:

external verifier portability
live vault proof
multisegment trace proof
subset receipt edges
controlled recovery

Together, these proof areas show that Trace evidence can move, remain verifiable, preserve continuity, support bounded projections and maintain operational recovery behaviour while respecting the distinction between proof truth and recovery mechanics.

The conclusion is:

Gate 15 demonstrates that Trace has a represented architectural proof layer for recorded execution history.

Purpose of Gate 15

Trace claims to turn selected execution activity into ordered, replayable, receipt-backed, portable, externally verifiable evidence.

The proof question is not:

Can Trace store events?

The proof question is:

Can Trace preserve recorded execution history in a form that can be packaged, moved, verified, checked for tampering, projected into bounded receipts and separated from non-canonical recovery mechanics?

Gate 15 answers that question through a structured set of architectural proof areas.

Gate 15 Proof Model

The proof model is organised around five areas:

G15-01 External Verifier Portability
G15-02 Live Vault Proof
G15-03 Multisegment Trace Proof
G15-04 Subset Receipt Edges
G15-05 Controlled Recovery

Across those areas, Gate 15 represents twenty-nine expected architectural tests.

The proof status is represented, meaning the required architectural proof surfaces are present in the Gate 15 source record and no expected represented area is listed as missing.

Truth Boundary

Gate 15 has a deliberately narrow and credible truth boundary.

It proves recorded execution history through sealed segment truth and derived proof artefacts.

It does not prove business correctness.

It does not prove external source truth.

It does not claim that every real-world statement inside a customer payload is true.

The practical boundary is:

Trace proves the record.
The host system determines the strength of the claim.

Architectural Meaning

Taken together, the five Gate 15 areas show that Trace evidence can be:

copied outside the live tree
verified by a standalone external verifier
checked for tampering
packaged into vault archives
bound to exact segment bytes
preserved across multiple sealed segments
projected into bounded subset receipts
checked against selector mismatch
recovered operationally without treating recovery as proof truth

This is not a single feature. It is an architecture.

The combined meaning is that Trace has represented proof surfaces for the core evidence lifecycle:

recorded evidence
sealed evidence
packaged evidence
portable evidence
subset evidence
verified evidence
tamper-detected evidence
operationally recoverable evidence
truth-bounded evidence

Controlled Source Record

The full source records behind this summary are retained by Caersyn. They include detailed execution records, complete test inventories, source summaries and implementation-level artifacts. Those materials are available only through controlled diligence because they contain internal test structure and operational detail.