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In this work we establish the optimal regularity for solutions to the fullynonlinear thin obstacle problem. In particular, we show the existence of anoptimal exponent $\alpha_F$ such that $u$ is $C^{1,\alpha_F}$ on either side ofthe obstacle.  In order to do that, we prove the uniqueness of blow-ups at regular points,as well as an expansion for the solution there.  Finally, we also prove that if the operator is rotationally invariant, then$\alpha_F\ge \frac12$ and the solution is always $C^{1,1/2}$.

Optimal regularity for the fully nonlinear thin obstacle problem