The aim of this study is to investigate the structural and constitutive asymmetry between facts and propositions, subject to different degrees of determination, which lead us to the hypothesis of true propositions as properties of facts or of the world, with semantic, metaphysical and epistemic consequences. From the semantic point of view, we start from the classification of Russell between sense and denotation of linguistic sentences, to apply it to the empirical or contingent propositions, in its relationship with the complex facts that make them true, in defense of a realist theory of truth. From the metaphysical point of view, we analyze the nature of facts and propositions, as structured and unified complexes, whose difference of constitution supports the hypothesis that propositions abstract partial aspects of concrete facts. The overall complexity of the facts, events or situations, with faintly delimited spatiotemporal boundaries, leads us to a comparison between the relations of truthmaking and causality, which will be useful for developing our hypothesis, to be discussed further through an analysis of the notion of a particularized property or trope. And from the epistemic point of view, we investigate to what extent are abstract propositions identifying properties of concrete facts, and how can we know them, by assuming the Russellian distinction between direct and indirect knowledge.