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WORM ledger storage architecture

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Foundry’s storage architecture is built on the principle of structural immutability, ensuring that data archives remain tamper-evident and readable for the long term. This document synthesizes the engineering decisions behind the tile-based storage engine and the transition from hosted environments to verified microkernels.
The platform’s storage architecture is built on the principle of structural immutability, ensuring that data archives remain tamper-evident and readable for the long term. This document synthesizes the engineering decisions behind the tile-based storage engine and the transition from hosted environments to verified microkernels.

## 1. The Tile-Based Storage Engine

Foundry adopts the **C2SP tlog-tiles** specification as its fundamental storage primitive. This format, utilized by Sigstore Rekor and Google’s Certificate Transparency, breaks a Merkle tree into static, append-only files (tiles).
The platform adopts the **C2SP tlog-tiles** specification as its fundamental storage primitive. This format, utilized by Sigstore Rekor and Google’s Certificate Transparency, breaks a Merkle tree into static, append-only files (tiles).

* **Atomic Durability:** Finalized tiles are written using a write-then-rename discipline followed by a mandatory `fsync`. This ensures that partial writes never corrupt the ledger state.
* **Plain-Text Transparency:** Following the DARP principle, tiles are stored as newline-delimited base64 text. This ensures that the storage remains inspectable using standard Unix utilities (`cat`, `base64`, `sha256sum`).
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## 4. Synthesis of Innovation

The primary innovation in Foundry’s storage layer is the integration of high-performance verifiable logs with a "sovereign-first" deployment model. Unlike legacy WORM solutions that require proprietary hardware or specific cloud vendors, Foundry’s tile-based logs are portable, open-standard, and self-verifying across any hardware from a virtual machine to an seL4-hardened Totebox appliance.
The primary innovation in the platform’s storage layer is the integration of high-performance verifiable logs with a "sovereign-first" deployment model. Unlike legacy WORM solutions that require proprietary hardware or specific cloud vendors, the platform’s tile-based logs are portable, open-standard, and self-verifying across any hardware from a virtual machine to an seL4-hardened Totebox appliance.

## See also
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