trillian

Trillian is a scalable implementation of verifiable data structures, particularly designed for transparency logging applications, such as Certificate Transparency. It utilizes a Merkle tree architecture to provide a robust, append-only log mode that supports large data volumes, enabling developers to create custom applications, or "personalities," on top of its core functionality. Although Trillian is in maintenance mode and encourages the use of its successor Tessera for new implementations, it remains a valuable tool for organizations requiring a stable transparency log system.