Double-Staking Validator Drift in Proof-of-Stake Networks: Structural Exploit Vectors and Logic-Layer Enforcement

Proof-of-Stake (PoS) networks rely on economic staking guarantees to align validator behavior with network security. However, a growing class of architectures permits validators to reuse, rehypothecate, or synthetically represent the same stake across multiple validation contexts. This paper defines Double-Staking Validator Drift as a structural vulnerability in which a validator’s effective economic exposure diverges from its apparent security contribution. We demonstrate how this drift undermines slashing guarantees, enables risk amplification, and creates false decentralization signals across PoS Layer-1 and restaking ecosystems. Existing mitigations—including slashing, social governance, and restaking policies—are shown to be insufficient due to enforcement blind spots and cross-domain opacity. We propose a logic-layer enforcement model that introduces validator-level stake exclusivity, temporal binding, and deterministic enforcement across consensus domains. This approach restores economic integrity to PoS security models and closes a critical gap in current network designs.