Generative coordination is one of the most prominent coordination models for implementing open systems due to its spatial and temporal decoupling. Recently, a coordination community effort have been trying to integrate security mechanisms to this model aiming to improve its robustness. In this context, this paper presents the BTS coordination model, which provides a Byzantine fault-tolerant tuple space. Byzantine faults are commonly used to represent both process crashes and intrusions. As far as we know. BTS is the first coordination model that supports this dependability level.