A decentralized blockchain-based voting system is a way of conducting secure and efficient elections using blockchain technology. Blockchain is a system of storing data in blocks that are linked together and verified by a network of nodes. This ensures that the data is transparent, immutable and distributed.

One problem that such a system can solve is voter fraud. By encrypting and storing each vote as a transaction on the blockchain, it becomes impossible to tamper with or duplicate votes. Another problem that it can solve is voter accessibility. By allowing voters to cast their votes online using their credentials, it eliminates the need for physical polling stations and reduces costs and efforts.