Java with Blockchain (Cryptocurrency) java by devs5003 - May 2, 2020June 3, 20220 Java with Blockchain (Cryptocurrency) What Is a Blockchain ? A blockchain can be thought of as a decentralized, immutable data structure that undergoes state transitions that modify its state. State iterates with transactions or operations on the blockchain, the small print of which are written to the block— chain. These transactions are grouped into blocks, which are linked together, making up the blockchain.Much like the event log used in event sourcing, current state is derived by replaying the state transitions that have taken place previously. A blockchain is a distributed ledger technology (DLT), a term that has emerged for describing technologies like blockchain that provide decentralized storage of data. Development of Blockchain: A very brief history of Blockchain technology started with the cryptocurrency Bitcoin.