Plasma has published a technical article describing Torch, a validator handoff mechanism based on Fast-HotStuff. The design does not require adjacent validator committees to share members, nor does a successful handoff require additional communication rounds or a pause in block production. However, message transmission overhead increases during the handoff. The proposed dynamic epoch-boundary scheme has not yet launched, the related work is undergoing peer review, and Plasma plans to publish a formal white paper and machine-checked proof within the year.