L2-DVT-INTEG CRITICAL PRESERVATION Level 2 · software

Data Integrity System

Data Integrity Verification and Repair System

The Data Integrity Verification and Repair System is an autonomous 15-kilogram subsystem comprising radiation-hardened FPGA co-processors and dedicated software designed to prevent data loss over a 100-year mission lifetime. In the lunar radiation environment, cosmic ray strikes and radiation-induced single-event upsets produce continuous bit-flips across digital storage and localized damage in 5D quartz glass. Drawing 50 watts of power, the triplicated hardware maintains a 10-gigabyte-per-second hash throughput to execute 7-day scrub cycles across 10 petabytes of digital storage, applying cryptographic hash trees, multi-level error-correcting codes, and cross-media comparisons to autonomously repair corrupted blocks.

Autonomous data integrity system performing continuous verification, error detection, and repair across all storage media through cryptographic hashing, error-correcting codes, and cross-media comparison.

Purpose

Ensure zero data loss over the 100-year active mission by continuously verifying data integrity, detecting bit-rot and corruption, applying error correction, and orchestrating data repair through cross-media redundancy when corruption exceeds single-medium correction capability.

Context

In the harsh lunar radiation environment, bit-flip errors in digital storage are inevitable. Even 5D quartz glass may experience localized damage from cosmic ray strikes. The integrity system is the immune system of the Data Vault, continuously monitoring health and initiating repair before corruption becomes unrecoverable.

Principles

▸Cryptographic hash trees (Merkle trees) for efficient change detection across petabyte-scale data
▸Multi-level error correction: hardware ECC, block-level Reed-Solomon, file-level checksums, archive-level parity
▸Cross-media verification: compare digital, quartz, and analog copies to resolve discrepancies
▸Scheduled scrubbing: systematic read-verify-correct cycles across all stored data
▸Immutable audit trail of all integrity events and corrections

Typical implementations

▸SHA-3 or BLAKE3 hash computation for data block verification
▸Reed-Solomon and LDPC error-correcting codes at block level
▸Merkle tree structures for hierarchical integrity verification
▸ZFS-like copy-on-write integrity with checksumming at every level
▸Automated data repair pipeline: detect -> locate -> correct -> verify

Lunar considerations

▸Radiation-induced single-event upsets in digital storage require continuous scrubbing
▸Scrubbing 10 PB of digital storage requires careful scheduling to manage power and I/O load
▸5D quartz integrity verification is slower (optical readback) and done on sampling basis
▸Integrity system itself must be radiation-hardened and triplicated
▸100-year accumulation of cosmic ray damage necessitates proactive replacement scheduling
▸Must distinguish between correctable and uncorrectable errors to prioritize maintenance

Specifications

Functional

primary function	Continuously verify and maintain data integrity across all Data Vault storage media
inputs	Data blocks from L2-DVT-DIGI and L2-DVT-5DQ for verification, Hash databases and parity information, Error correction code redundancy data, Storage health telemetry
outputs	Integrity status reports per storage tier, Corrected data blocks (written back to storage), Uncorrectable error alerts with affected data identification, Module replacement recommendations, Integrity audit trail
digital scrub cycle days	7
quartz sample verification interval days	90
hash computation throughput gb per s	10
error detection probability	0.999999
correction capability percent errors	10
maximum data loss bits	0

Physical

mass kg	15
dimensions	Software system with dedicated hash computation FPGA co-processor
materials	Radiation-hardened FPGA for hash computation, Dedicated integrity metadata storage
runs on	L2-DVT-DIGI server array with dedicated FPGA accelerator
metadata storage tb	5

Operational

power consumption w	50
thermal range c	0, 50
lifetime years	100
mtbf hours	500000

Interfaces

Provides

→Data Vault (Digital)Data integrity assurancecritical
Continuous verification that all stored data remains uncorrupted
→Digital Server ArrayScrubbing and correction commandscritical
Scheduled scrub operations and error correction writes to digital storage
→L1-MAINTStorage module replacement alertsessential
Identification of storage modules approaching uncorrectable error thresholds

Requires

←Digital Server ArrayData read accesscritical
Sequential read access to all digital storage for scrubbing
←5D Quartz Glass ArchiveSample readback accessessential
Periodic optical readback of quartz disc samples for verification
←Power Generation SystemElectrical powercritical
50W for hash computation accelerator and integrity metadata storage