RUIDs (Rodrigo’s Unique Identifiers) are a system for generating 64-bit unique identifiers designed to be mathematically unique within the same RUID root, which is a set of generators identifiable through shared configuration. The system uses 41 bits for the timestamp, 14 bits for a sequence number, and 9 bits for the root id, further divided into cluster and node ids. RUIDs accommodate time travel by using a millisecond maximum time travel threshold, although this design has limitations when the generator is inactive during time travel. Written in Rust and highly performant, RUIDs can be integrated easily via an actix HTTP server, and while primarily developed for Rodrigo’s benchmarking needs against 128-bit UUIDs, they offer a simpler alternative to existing systems like Instagram's IDs, Twitter’s Snowflake, and Sony’s Sonyflake, without external dependencies. Despite their specific use case, RUIDs can be ported to other environments due to their minimalistic codebase, and they are documented on GitHub for those interested in implementation details.