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+# Sovereign Cloud Infrastructure (SCI)
+
+## Overview
+
+SCI is DBIS' **planetary-scale sovereign cloud**, providing:
+- High-security compute
+- Isolated sovereign runtime environments
+- Global redundancy
+- PQC-secured compute fabric
+
+## Architecture
+
+### Sovereign Compute Zones (SCZs)
+
+- One per SCB
+- Zero-trust isolation
+- PQ-HSM for key operations
+
+**Service**: `sci-zone-manager.service.ts`
+
+**API Endpoint**: `POST /api/v1/sci/zone/create`
+
+### Global Replication Grid (GRG)
+
+- DBIS-led multi-region replication
+- Metadata hashing every 30 seconds
+
+**Service**: `sci-replication.service.ts`
+
+**API Endpoint**: `POST /api/v1/sci/replication/start`
+
+### Sovereign EVM (SEVM)
+
+Smart contract execution for:
+- CBDC workflows
+- FX swaps
+- Commodity token redemptions
+- Settlement contracts
+
+**Service**: `sci-sevm.service.ts`
+
+**API Endpoint**: `POST /api/v1/sci/sevm/deploy`
+
+## Security Features
+
+- TPM-backed nodes
+- PQ-encrypted channels (Kyber)
+- Cross-zone firewalls
+- Continuous integrity attestations
+
+**Service**: `sci-security.service.ts`
+
+**API Endpoint**: `POST /api/v1/sci/security/attestation`
+
+## Database Models
+
+- `SovereignComputeZone` - SCZ configurations
+- `SovereignReplication` - GRG replication records
+- `SevmContract` - SEVM smart contract deployments
+- `SovereignAttestation` - Integrity attestation records
+
+## Integration Points
+
+- Quantum crypto service (existing)
+- HSM service (existing)
+- Smart contract service (existing)
+