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The engineering library for the PointSav platform — operating systems and services for regulated businesses that own their data, their AI, and their record-keeping outright. Where the monorepo holds the code, this wiki holds the reasoning: architecture, services, security, and the governance commitments that bind future development.

PointSav Digital Systems

seL4 microkernel substrate

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eefc33ef · PointSav Digital Systems ·

fix(bcsc): correct 5 articles falsely asserting os-console runs under seL4 with a custom WGPU/SDF-glyph stack — hedge to planned/roadmap language per BRIEF-os-console-rebuild-2030's honesty rail

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@@ -2,7 +2,7 @@
schema: foundry-doc-v1
title: "seL4 microkernel substrate"
slug: sel4-microkernel-substrate
short_description: "Formally verified seL4 microkernel adopted as the L1 kernel for all PointSav operating systems, guaranteeing memory isolation and capability-based permissions structurally."
short_description: "Formally verified seL4 microkernel, PointSav's planned shared L1 kernel substrate — not yet the running kernel for every OS family member as shipped today."
category: substrate
type: concept
content_type: topic
@@ -11,7 +11,7 @@ status: active
audience: vendor-public
bcsc_class: public-disclosure-safe
language_protocol: PROSE-TOPIC
last_edited: 2026-05-15
last_edited: 2026-07-18
editor: pointsav-engineering
paired_with: sel4-microkernel-substrate.es.md
references:
@@ -23,7 +23,20 @@ references:
    url: "https://sel4.systems/Info/Docs/seL4-manual-latest.pdf"
---

The seL4 microkernel is the mathematically formally-verified L1 kernel on which all PointSav operating systems run — its security properties are proved by formal mathematical proof, not asserted by testing. [^1] PointSav adopts seL4 as raw material rather than building a custom kernel, and constructs its proprietary Rust layer above it. Memory isolation, zero buffer overflows, [[capability-ledger-substrate|capability-based permissions]], and deterministic execution are guaranteed structurally — the foundation for security claims that can be reasoned about formally and presented to regulators rather than merely asserted through penetration testing. This article covers the architectural rationale, the layered stack, the toolchain constraints, and the [[system-substrate-doctrine|language discipline]] enforced above the kernel.
The seL4 microkernel is the mathematically formally-verified L1 kernel PointSav has
adopted as the planned shared substrate for its operating systems — its security
properties are proved by formal mathematical proof, not asserted by testing. [^1] **This
is the platform's target substrate, not a description of every shipped OS today**:
`os-console`, for example, ships today as a standard terminal application with no current
seL4 dependency. PointSav adopts seL4 as raw material rather than building a custom
kernel, and constructs its proprietary Rust layer above it. Where seL4 is the actual
running substrate, memory isolation, zero buffer overflows,
[[capability-ledger-substrate|capability-based permissions]], and deterministic execution
are guaranteed structurally — the foundation for security claims that can be reasoned
about formally and presented to regulators rather than merely asserted through
penetration testing. This article covers the architectural rationale, the layered stack,
the toolchain constraints, and the [[system-substrate-doctrine|language discipline]]
enforced above the kernel.

## Why adopt rather than build
Important Information

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