Tamper-evident storage is a data storage architecture designed so that any unauthorised modification of stored records leaves a detectable trace, typically achieved through cryptographic hash chaining, content addressing, or append-only write structures such as a Merkle DAG. It provides the storage-layer implementation of tamper evidence, ensuring that audit logs and other sensitive records can be verified for integrity after the fact rather than merely trusted. Tamper-evident storage is a foundational requirement for audit logs used in regulated or security-critical systems.