Ledger security refers to the measures taken to protect the integrity and confidentiality of transaction records within a blockchain or distributed ledger system. Each transaction is stored in blocks, which are linked in a chain. This design ensures that data cannot be easily altered or deleted.To maintain ledger security, cryptographic techniques are employed. These methods encrypt transaction data, ensuring only authorized users can access or modify it. Additionally, consensus mechanisms, like proof of work or proof of stake, help ensure that all participants agree on the validity of transactions.Another important aspect is the decentralization of ledgers. By distributing copies of the ledger across numerous nodes, the risk of a single point of failure or manipulation decreases significantly. Any attempt to alter the ledger would require control over a majority of these nodes, which is highly improbable.Overall, ledger security is vital for building trust and ensuring the reliability of transactions, as it protects against fraud, hacks, and unauthorized changes.