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FS architecture and the WORM backbone

Service-FS Architecture: The {{gli|WORM}} Backbone

service-fs is the per-tenant Write-Once-Read-Many ({{gli|WORM}}) immutable ledger substrate. It serves as the durable backbone for the Foundry Three-Ring Architecture, providing the primary landing zone for all Ring 1 boundary-ingest services. Every critical record—including identity anchors, email communications, and document artifacts—is persisted through this substrate to guarantee tamper-evidence and long-term availability.

The Four-Layer Architecture

To ensure modularity and survivability, service-fs is implemented as a decoupled four-layer stack:

  • L4: Anchoring (Workspace-Tier): Monthly periodic work that anchors signed checkpoints to the public Sigstore Rekor log.
  • L3: Wire Protocol: The communication interface (HTTP/axum today; MCP long-term) that enforces per-tenant moduleId boundaries.
  • L2: {{gli|WORM}} Ledger API (Rust Trait): The stable core contract (append, read_since, checkpoint) that survives changes to the layers above or below.
  • L1: Tile Storage Primitive: The envelope-specific storage engine (POSIX on Linux; capability-mediated on seL4) utilizing the C2SP tlog-tiles format.

Dual Boot Envelopes

A core innovation of service-fs is its ability to operate across two distinct runtime envelopes using the same codebase:

  1. Envelope A (Current): A Linux/BSD daemon under systemd. It utilizes standard POSIX file I/O and process isolation.
  2. Envelope B (Intended): A verified seL4 Microkit Protection Domain. It is intended to utilize moonshot-database (PSDB) for capability-addressed storage, providing formally verified tenant isolation.

Durability and Compliance

Foundry achieves structural {{gli|WORM}} compliance by structurally denying record modification at the storage layer. This is reinforced by:

  • C2SP tlog-tiles: An open-standard text-based format ensuring 100-year readability.
  • C2SP signed-note Checkpoints: Compact, signed artifacts that prove the state of the ledger at any point in time.
  • Audit-Log Sub-Ledger: A dedicated {{gli|WORM}} ledger that records every read event to satisfy SOC 2 processing integrity requirements.

This architecture ensures that service-fs remains portable, verifiable, and resilient to vendor obsolescence.

Copyright © 2026 Woodfine Capital Projects Inc. Licensed under Creative Commons Attribution 4.0 International.

Woodfine Capital Projects™, Woodfine Management Corp™, PointSav Digital Systems™, Totebox Orchestration™, and Totebox Archive™ are trademarks of Woodfine Capital Projects Inc., used in Canada, the United States, Latin America, and Europe. All other trademarks are the property of their respective owners.

Important Information

Important Information

Corporate structure. PointSav Digital Systems ("PointSav") is a trade name of Woodfine Capital Projects Inc. ("Woodfine"). PointSav does not itself offer, sell, or solicit any security. Any securities offering associated with Woodfine's real-property direct-hold solutions is made exclusively by Woodfine, and only by means of the applicable Private Placement Memorandum.

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