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FS architecture and the WORM backbone

Every record written to the PointSav platform — identity anchors, email communications, document artifacts — lands in service-fs, a per-tenant Write-Once-Read-Many (WORM) immutable ledger. Once written, records cannot be modified or deleted; the ledger is the tamper-evident backbone that Ring 2 services query and Ring 1 services write to. For a regulated operator, this means every data event has a provable, auditable history from the moment it enters the platform. The worm-ledger-design article describes the WORM design philosophy in detail.

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 performed by fs-anchor-emitter 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: 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) using the C2SP tlog-tiles format.

Dual Boot Envelopes

A core design property of service-fs is its ability to operate across two distinct runtime envelopes using the same codebase. The WORM storage architecture article describes how each envelope satisfies the append-only constraint.

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

Durability and Compliance

The platform achieves structural 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 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.

See also

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.

No investment advice. This wiki's content is provided for engineering, operational, research, and development purposes. Nothing on this wiki constitutes investment advice or a solicitation to invest in any Woodfine partnership or direct-hold solution.

Intellectual property. The PointSav name, trade name, wordmark, and marks, together with all current and future PointSav- and Totebox-branded products, services, and offerings — and the software, source code, documentation, design system, and all related materials — are proprietary to Woodfine and its affiliates, except for components identified as open source. No rights are granted except as expressly set out in a written license or agreement. See TRADEMARK.md in this repository for the full trademark notice.

Open source components. Portions of the platform are made available under permissive open-source licenses identified in the accompanying repository. Use of those components is governed by their respective license terms.

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Confidentiality. Where an article describes an operational or deployment detail that is not intended for public disclosure, that article is not published on this wiki. Content here is general-purpose engineering documentation, not customer-specific configuration.

Jurisdiction. Woodfine Capital Projects Inc. is organized in British Columbia, Canada. References to the Sovereign Data Foundation on this wiki describe a planned or intended initiative only, not a current equity holder or active governance body.

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