Sovereign Hybrid Blockchains for Regulated DeFi: A Cambodia Design Case

Abstract

Emerging economies face a sharp version of a general dilemma: permissionless decentralized finance imposes compliance and usability costs that regulated institutions and ordinary users cannot absorb, while central bank digital currency pilots typically foreclose composability and independent development. We present the design of a sovereign hybrid blockchain -- open and composable within a national perimeter, closed and governed with respect to the outside world -- and evaluate it as an implemented system. The design enforces identity beneath the contract layer, separates a native settlement asset from pluggable tokenized local-currency instruments, routes all outbound value through a single governed gateway, and distributes institutional powers across smart contracts. We instantiate it as a permissioned Avalanche Layer-1 and evaluate its central claim against two unmodified production protocols, Uniswap V2 and Aave V3, deployed from published upstream artifacts on a live chain. Both run without source modification, and compliance holds wherever the regulated asset itself moves. But the claims these protocols issue against the asset carry none of its rules. Pool shares and interest-bearing deposit receipts reach addresses holding no identity attestation and no permission to transact; the lending receipt accrues, and the protocol computes a borrowing entitlement for an address the identity registry does not recognise. Base-layer identity enforcement secures custody of an asset, not exposure to it. We further report that a sovereign fee policy set for inclusion forecloses standard interoperability tooling, that a parent-chain fee balance halts the chain silently, and that redeploying the contract suite partitions the compliance perimeter rather than replacing it.