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WORM ledger substrate: four-layer architecture and two boot envelopes

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`service-fs` provides the per-tenant Write-Once-Read-Many (WORM) immutable ledger that serves as the durable backbone for all Ring 1 boundary-ingest services. By enforcing a strict append-only invariant through cryptographic hash-chaining and structural isolation, the platform ensures that identity, communications, and document records remain tamper-evident and permanently accessible.
[[service-fs-architecture|`service-fs`]] provides the per-tenant Write-Once-Read-Many (WORM) immutable ledger that serves as the durable backbone for all [[three-ring-architecture|Ring 1]] boundary-ingest services, including [[service-people]] and [[service-email]]. By enforcing a strict append-only invariant through cryptographic hash-chaining and structural isolation per the [[worm-ledger-design|WORM ledger design]], the platform ensures that identity, communications, and document records remain tamper-evident and permanently accessible.

## Architectural integration

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## See also

- [[worm-ledger-design]]
- [[worm-ledger-storage-architecture]]
- [[cryptographic-ledgers]]
- [[sel4-microkernel-substrate]]
- [[worm-ledger-design]] — regulatory compliance mapping and the structural immutability argument
- [[worm-ledger-storage-architecture]] — storage-layer detail: tile format, atomic durability, and dual-target envelopes
- [[cryptographic-ledgers]] — the broader cryptographic ledger context
- [[sel4-microkernel-substrate]] — the intended seL4 capability-enforcement trajectory for tenant isolation
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