How does Zilliqa verify transactions?

Zilliqa uses a Hybrid consensus mechanism that integrates Proof-of-Work with sharding as consensus protocol. The definition of sharding simply put can be explained as followed : it is the process of separating a big chuck into smaller chunks while maintaining a whole. Through sharding, Zilliqa shard its nodes into smaller nodes for its verification process by allowing to increase the amount and validation of the transactions while maintaining a high speed flow of network. The verifications process is done by a set of randomly selected nodes.