Cospan contexts and higher categories

Motivated by the desire to turn the cobordism hypothesis (a statement about the universal property of some $n$-category of bordisms) into a $1$-categorical statement, we prove that all $n$-categories can be modeled by \emph{$n$-cospan contexts}: these are $1$-categories equipped with a collection of iterated cospans that satisfy a composition property in terms of pushouts. In particular, we construct an adjunction from ${\mathsf{C}\mathsf{a}\mathsf{t}}_n$ to the category of $n$-cospan contexts which simultaneously generalizes the $n$-fold span construction of Haugseng and the twisted arrow category construction (when $n=1$).