What is the function of the onus?

Excuse me, could you please clarify what exactly you mean by "the onus" in this context? Is it referring to a legal or financial term, or perhaps a specific concept within the realm of cryptocurrency or finance? Without a clear definition or context, it's somewhat difficult to accurately describe its function. However, generally speaking, the term "onus" often refers to the responsibility or burden of proof placed upon a particular individual or party in a given situation. In a financial or legal context, this might mean the obligation to provide evidence or justification for a claim or action. Could you please provide some more information so I can give a more precise answer?