Summary: To get around the problem of negative interest rates the IMF proposes to divide the monetary base into two separate local currencies. Cash and e-money. Cash would have an exchange rate against e-money. The conversion rate would devalue cash. https://blogs.imf.org/2019/02/05/cashing-in-how-to-make-negative-interest-rates-work/
Hmmmm, CB's want to get rid of physical cash so they can control the system, you and I better. So if we go down this path, our local FIAT currency get devalued and something like an SDR (IMF controlled) becomes the e-money which we drift to an SDR (other e-money equiv) as it had greater purchasing power to begin with as physical cash devalues?