A blockchain is a distributed ledger that is maintained by a group of computers linked to the network. Nodes are the machines that make up the network. Nodes that are accepted by the majority of the network add new blocks to the blockchain. The nodes that maintain the blockchain are paid with money for their work. To add a new block to the blockchain, the user must pay a modest fee. Maintaining a blockchain is an essential step in ensuring that it remains functioning and safe. Updating, monitoring, troubleshooting, repairing, and optimizing the blockchain are all part of the maintenance process. Securing the blockchain is also an important step in ensuring its safety and security.