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Blockchain in Java. Create a blockchain of transactions in Java in just 15 minutes using hashing techniques to ensure a secure chain of events. Blockchain uses hashing algorithms similar to encryption techniques used in password security. The blockchain approach takes hashing to the next step by linking blocks in a series to make transactions in the chain of blocks secure and preventing fraud through a distributed ledger. This takes security away from a central authority and places security in the realm of peer to peer crowdsourced security.