Zvonimir developed a robust on-chain randomness capability for the OriginTrail/dkg-evm-module, focusing on secure distributed key generation within blockchain environments. He designed and implemented a modular Random Sampling framework using Solidity, introducing a dedicated library, persistent storage structures, and core contract logic to manage challenge lifecycles and active proof periods. His approach emphasized clear separation of concerns, on-chain access control, and comprehensive event emissions to enhance security, observability, and auditability across multiple chains and identities. By enabling deterministic and auditable randomness, Zvonimir’s work addressed critical requirements for distributed key generation workflows, demonstrating depth in smart contract development and blockchain architecture.