The consensus algorithm of blockchains makes it virtually impossible to alter any data once it is stored in the blockchain. The consensus algorithm of a blockchain is an elaborate mechanism that ensures that the data captured on all the nodes in the blockchain network (the participating computers or servers that store a copy of the blockchain ledger) is uniform. This means that the data stored on each node, as well as the sequence in which the data is organized, is the same throughout all the nodes in the network.
This also means that once data is written or captured in a blockchain, it is virtually immutable—that is, it cannot be modified as long as the blockchain network remains unchanged. If the recorded data on one of the nodes is altered, the consensus algorithm prevents the altered data from being written to the other...
