Instead of a simple redirect, the "1Link" creates a smart wrapper around the destination URL.
While there isn't a single "official paper" by that specific name, you can find detailed information on MEGA's operations, security protocols, and compliance in their authoritative publications: mega1link
For a technical "white paper" style overview of how MEGA links and storage function, the MEGA Security Page details their : Instead of a simple redirect, the "1Link" creates