Lubin's conjecture for height-one $p$-adic dynamical systems

We prove Lubin’s conjecture for height-one commuting pairs of formal power series defined over the ring of integers $\mathcal{O}$ of any finite extension of ${\mathbb{Q}}_p$. Using some $p$-adic Hodge theory, we show that such a pair is a pair of endomorphisms of a formal group defined over $\mathcal{O}$.