points constitutes the layer of user payment means. In credit card payments, the core processing involves the data centers of the card issuer as well as those of the banks. Merchants receive credit card payments on their bank accounts, and users make periodic payments to clear their card balances. Here, user payment means are composed of physical cards and point-of-sale terminals. In digital currencies that rely on DLT systems, consensus mechanisms underlie the trust in the core processing function, whereas digital wallets are the main means of user payment access. A
those of the author(s) and do not necessarily represent the views of the IMF, its Executive Board, or IMF management. Publication orders may be placed online or through the mail: International Monetary Fund, Publication Services P.O. Box 92780, Washington, DC 20090, U.S.A. T. +(1) 202.623.7430 publications@imf.org IMFbookstore.org elibrary.IMF.org Contents Executive Summary I. Introduction II. Payment System Components III. Comparing Energy Use Across Crypto Assets Comparing Consensus Mechanisms: PoW and Non-PoW DLT Systems Impact