What should I know about blockchain before joining an MCA?

Blockchain is a distributed record technology in which transactions can be stored in linked, tamper-evident records. MCA students interested in the area should understand distributed systems, consensus and smart-contract concepts. For an MCA learner, the best way to understand blockchain is to connect the theory with a small working example. This point is specifically relevant to the blockchain aspect of MCA study. For this specific question about blockchain, the practical takeaway is to relate the concept to your own MCA learning goal.