An Analysis of "On Certainty" If read closely, much of what I've written implies that Wittgenstein's OC enhances the traditional view of knowledge as JTB. I believe that JTB is still a good definition, but given OC, it needs a bit more nuance. Let me be a bit more precise about my view of JTB given the backdrop of OC.
So, integrating JTB into OC involves rethinking how we use justification and truth, and how we think of beliefs. For example, justification often focuses on logic or rational argument, but Wittgenstein's approach is more practical focusing on the various language games within our forms of life. Also to acknowledge the limitations of justification as foundational or bedrock to our whole system of knowledge. Thus, what constitutes justification is based on the context of the language game being played. To understand this requires a good understanding of Witt's views in the PI.
My approach to truth is that it's more about their role in different language games. So, one role is that statements can be true as part of a framework, like the role of hinges or the role that rules play in a game. These are not truths that are justified, but truths that are part of our background certainty (and they can be used as propositions in an argument).
The other predominant role of truth is those that are justified, these are epistemological, i.e., they are used in our language games of epistemology. So, I don't think the use of truth is restricted to the language games of epistemology. I guess this is a dualistic approach to truth.
You can think of traditional JTB as being enhanced by OC. First, with the base layer of hinge propositions (or as I like to say basic beliefs or basic subjective certainties). In this layer justification and truth are about their role in our system of epistemology, viz., they're bedrock to our system of epistemology. In other words, they allow the language games of epistemology to take root.
The upper layers above the base layer (bedrock) are more akin to the traditional language games of JTB. This is where the typical role of inference takes place.
Then there is the role of skepticism in all of this or the role of doubting. Some claims don't need to be justified in response to skeptical doubt because they are part of what makes doubting possible.
This view of knowledge (JTB) is more holistic and is connected to a web of beliefs, practices (forms of life), and language games. So, JTB is enhanced by Wittgenstein and how it correlates with our practical life, viz., how we act (linguistically and as we move in the world).
By integrating these ideas the traditional model of JTB can be enhanced.
So, whenever I use JTB this is what I think about.