Ledger

A ledger is a large log-type database that records all transactions chronologically. This ledger is either centralized or decentralized depending on its use.

Cryptocurrencies use decentralized ledgers (Decentralized Ledger), where each node has a copy of this ledger. The decentralized ledger is a key element of the blockchain, but it is not one. The blockchain is a type of decentralized ledger, on which a layer of high security such as cryptography is added.

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