Crypto Basics

What Is a Central Bank Digital Currency — AKA, a CBDC?

Published on:
September 30, 2020

Central bank digital currencies are a lot different from the cryptocurrencies that you are familiar with.

Table of Contents

CBDCs are digital currencies issued by a central bank whose status as legal tender depends on government regulation or law. 

It’s not correct to say that CBDCs are the same as cryptocurrencies — in fact, a lot of the properties of CBDCs are the direct opposite of everything that most cryptocurrencies stand for.

CBDCs remain fully within the orbit of the traditional, intermediated financial system of fiat currencies, which are backed by trust in the currency's issuer: a national central bank and ultimately, the sovereign government or political authority behind it.

In simplest terms, this means that CBDCs are backed by governments — which is not something that you’d see in a cryptocurrency project.

Decentralized cryptocurrencies like Bitcoin have their roots in a cypherpunk and libertarian challenge to the status quo: they are a critique of an exclusionary monetary system run by independent central bankers and technocrats who are largely immune to democratic pressures and public scrutiny.

Satoshi Nakamoto, the mysterious and still unknown inventor(s) of Bitcoin, famously embedded the cryptocurrency’s genesis block with a Times headline about the United Kingdom teetering “on the brink of a second bank bailout” following the 2008 financial crisis.

While Bitcoin intends to create a new financial system from the outside, crypto’s emergence and growing popularity has — perhaps inevitably — spurred on significant innovation within the citadel of traditional finance itself. 

This is most strikingly shown in the phenomenal growth of interest in central bank digital currencies, or CBDCs for short.

By early 2019, the Bank for International Settlements — a Swiss organization made up of 60 of the world’s central banks — estimated that a significant majority of central banks across the world were engaged in research into CBDC development. 

Are All Central Bank Digital Currencies Alike?

There are two main categories of CBDCs. 

The first is a “wholesale” variant, which is limited for use by financial institutions for wholesale settlements — i.e., for interbank payments or securities settlements. 

The second is a “retail CBDC” for the general public. 

Retail CBDCs are further split into two main types: “general purpose,” “account-based” or “token-based.” Retail CBDCs would in theory extend access to digital central bank money to the general public. They could therefore have much wider reaching implications for banks and the financial system as a whole than their wholesale counterparts. 

In the current system, intermediaries like commercial banks are responsible for dispute resolution, Know Your Customer (KYC) due diligence, deposit insurance and other services.

Depending on their design, retail CBDCs could alter the existing operational roles taken by central banks and private institutions within the financial system. 

For this reason, analysts have closely studied possible designs and architectures for retail CBDCs and explored their potential consequences for the legal structure of claims on the central bank and private institutions. 

A bottom line for CBDCs is that whatever design they take, their ultimate issuer and redeemer is the central bank: different designs would, however, affect the nature of claims on an intermediary (where relevant) and the records that are kept by the central bank.

This means that no matter how a CBDC looks, the responsibility for its structure and maintenance is with the central bank.

In an indirect, two-tier CBDC system, the structure of claims would be similar to the existing financial system. Commercial institutions would be mandated to fully back a CBDC-like liability to the consumer with their own CBDC deposits at the central bank. 

However, changes to this intermediated model could bring new regulatory and supervisory possibilities for central banks, though this would require a massive extension of their existing operations. For this reason, analysts have also researched hybrid architectures that would combine direct and indirect claims on the central bank.

What’s Stopping Central Banks From Releasing CBDCs Right Now?

Analysts have emphasized that for retail CBDCs to really take off, they would need to provide cash-like safety and convenience for peer-to-peer (and even cross-border) payments. They would also need to take into account provisions for “privacy by default” and universal accessibility.

Distributed ledger technologies like blockchain could expand the possibilities for preserving user privacy by replacing the conventional identity frameworks used for bank accounts with a secure, cryptographic identifier framework. 

This token-based system, based on digital signatures, would, however, pose several challenges — notably for AML/CFT due diligence and private key management — and would likely need additional safeguards. 

However, based on the results of existing proofs-of-concepts by central banks, blockchain technologies are currently unlikely to be implemented for a direct CBDC architecture because of the sheer volume of data throughput that would be required. 

However, blockchain architectures have been explored for hybrid or indirect CBDC models, as well as for wholesale CBDCs, given that the number of transactions in many wholesale payment systems is similar to that already handled by existing blockchain platforms.


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