The blockchain schemes permit the network entities to achieve a secure distributed state without centralized authority verification. It neglects the dependency on centralized authority in the decision-making process. In a decentralized blockchain scheme, the entities can estimate the trust level of others based on the transactions of the distributed ledger. The distributed ledgers are immutable or tamper-resistant blocks. However, the malicious nodes try to modify the ledgers of the blockchain to enjoy the network benefits selfishly. The distributed blockchain scheme successfully rejects malicious users with the help of the most trusted members of the network. This way, the decentralized blockchain schemes permit trusted communication among unknown entities. The blockchain decentralization schemes should have to focus on the below-mentioned points.