# Cross-Plane Execution Diagram

### Isolation Properties Across Execution Environments

Although strategy execution spans multiple blockchain environments with differing performance and security characteristics, all execution environments operate under a strict isolation model:

* Execution environments cannot modify share supply.
* Execution environments cannot alter `totalAssets()` without validated state inclusion.
* Execution environments cannot directly influence one another.
* Failures in one execution environment do not propagate to others.
* Unresponsive or invalid execution environments are automatically excluded from NAV computation.

This isolation model allows Multistake to absorb execution-layer faults gracefully while preserving accounting correctness and solvency guarantees.

#### Conceptual Architecture

```sql
                 +------------------------------------+
                 |         zkSync Home Vault           |
                 |  (ERC-4626, NAV, Accounting, Risk)  |
                 +--------------------+----------------+
                                      |
                             Capital Allocation
                                      |
          +---------------------------+----------------------------+
          |                           |                            |
          v                           v                            v
 +-------------------+     +-------------------+      +-------------------+
 | Execution Env A   |     | Execution Env B   |      | Execution Env C   |
 | Low-Cost / Stable |     | High-Throughput   |      | Low-Latency       |
 | Deterministic     |     | Parallel Execution|      | Real-Time Reactive|
 +-------------------+     +-------------------+      +-------------------+
          \                     |                            /
           \                    |                           /
            \                   |                          /
             +------------------+-------------------------+
                               |
                     Validation on zkSync
                               |
                               v
                        NAV Update (zkSync)
```

### Summary

Execution environments enable Multistake to match each strategy with the execution domain best suited to its computational intensity, latency sensitivity, and liquidity requirements. Strategies may operate across any supported blockchain environment while remaining fully decoupled from accounting and settlement.

zkSync serves as the deterministic settlement and validation layer, providing low-cost execution, fast finality, and validity-proof security for accounting, reconciliation, and NAV computation. By centralizing accounting on zkSync and isolating execution environments, the protocol preserves correct behavior regardless of performance variability, partial failures, or availability issues in any individual execution environment.

This architecture allows Multistake to safely exploit heterogeneous execution environments as a yield optimization mechanism without increasing trust assumptions or compromising protocol safety.


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