Definition ∞ Hash-based ledgers are distributed record-keeping systems that utilize cryptographic hash functions to secure and link data entries. Each new data entry or block includes a cryptographic hash of the previous one, creating an immutable and verifiable chain of information. Any alteration to a past entry would invalidate all subsequent hashes, making tampering readily detectable. This fundamental principle underpins the security and integrity of blockchain technology and other distributed ledger systems.
Context ∞ The security properties of hash-based ledgers are frequently cited in news discussions regarding the trustworthiness of digital assets and decentralized applications. Innovations in hash function design and ledger structures continue to be areas of active research, aiming to enhance scalability and efficiency. The ongoing reliability of these cryptographic foundations remains a key topic for industry participants.