In our interconnected cyber-physical world, the types and number of Internet of Things (IoT) will also increase. Such devices are also generally capable of capturing a broad range of information, including digital artifacts that can facilitate a digital investigation during a cyber security incident (e.g., data breach). In other words, IoT devices are potential evidence acquisition sources. We posit the importance of having a digital forensic black-box, conceptually similar to the cockpit voice recorder (also known as a flight recorder) on aircrafts, to facilitate digital investigations. Using a smart home comprising many different IoT devices (e.g., smart home devices, smart vehicles, and smart wearables) as an example, we discuss where such a black-box can reside and what sort of artifacts can be collected. This black-box can also complement other existing digital forensic readiness strategies, such as those described in ISO/IEC 27043:2015. We also explore the associated design requirements such as data provenance. There are changes required to the organization's current computing architecture in order to deploy our proposed black-box, as explained in this paper. In addition, we will explore the potential privacy implications and potential research opportunities (e.g., blockchain-based digital forensic black-box).