What does mantle mean?

Excuse me, could you please clarify the meaning of the word 'mantle' for me? I've come across it in a text related to cryptocurrency and finance, but I'm not quite sure how it fits into the context. Could you possibly provide a brief description or explanation of its usage in this field? I'm particularly interested in understanding how it might relate to cryptocurrency transactions, investments, or perhaps market trends. Your insight would be greatly appreciated.