&gt; Decentralized not usable in a legal context in any jurisdiction I can think of<p>I haven&#x27;t seen anyone writing on this topic who argues that a Bitcoin timestamp would not be usable anymore than your favored old-style notaries would be unusable. Can you point to any specific cases, or even something like a legal review, in which a Bitcoin timestamp is rejected as invalid?<p>&gt; why do you timestamp if not to cover your ass?<p>There are many uses for timestamps. Legal ones are not even my particular use case.