Blockchain interoperability is essential for enabling secure and reliable interactions across heterogeneous networks. However, existing notary schemes face two key issues: quantum vulnerability and rigid trust management. To address the first issue, this paper proposes a decentralized, quantum-resistant framework integrating post-quantum primitives ML-KEM and ML-DSA alongside AES-256, optimizing performance by using asymmetric cryptography for authentication and non-repudiation, and delegating bulk encryption to symmetric schemes. Under parallel loads of up to 270 transactions per second, this hybrid design reduces the end-to-end performance gap between the post-quantum and elliptic-curve approaches to under 6% on average, converging to within 0.2% at peak load. The second issue is handled by a dynamic trust model that uses Popoviciu's inequality to derive an adaptive discount factor $α$ based on variance in a Verifier's behavior, removing the need for fixed thresholds or multi-stage configuration, while a tunable dynamicity factor $k$ enables control over system sensitivity. We evaluated the trust model over 200 epochs under adversarial conditions, where the proposed model detects and responds to misbehavior that the baseline model fails to penalize adequately. These results demonstrate that quantum-resistant blockchain interoperability is practically achievable, with the proposed trust mechanism offering greater adaptability and resilience than existing approaches.

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