The decentralized public ledgering system is called a 'BLOCKCHAIN', which is used to record and manage transactions in traditional sectors like shipping, real estate, voting and stock trading.
Blockchain is basically a digital platform composed of huge number of databases or ledgers, which ensures zero knowledge proof that is one party can ensure correctness of any data without actually revealing any information of the set of data stored. In a decentralized blockchain system, nobody needs to know or rely on any information blindly as each set of information stored in the form of blocks carries with itself its verification proof. Each member present in the network of blockchain has a copy of the exact same data in the form of a distributed ledger. If a ledger of any member is altered or corrupted in any way by someone else, it will be out rightly rejected by majority of members present in that network.
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