Research on Online Quiz Scheme Based on Double-Layer Consortium Blockchain

The students' online quiz is a way to realize the informatization and modernization of higher education. To solve the problem that the scoring process is non-transparent, injustice and the final results are easy to be changed, an online quiz scheme based on Double-layer Consortium Blockchain is proposed. The scheme achieves the public verification of students' answers and the answer records cannot be tampered with but can be traced. Besides, group signature is used to solve the problem of anonymous abuse in blockchain applications. In addition, the storage pressure of sub-chains' nodes can be further reduced by adding the prime-chain's index to the sub-chains.