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Cash—physical money—is wonderful. You can transfer (or spend or give
away) as much of what you have as you want, when you want, without
any third parties approving or censoring the transaction or taking a
commission for the privilege. Cash doesn’t betray valuable identity
information that can be stolen or misused. When you receive cash in your
hand, you know that the payment can’t be ‘undone’ (or charged back, in
industry jargon) at a later date, unlike digital transactions such as credit
card payments and some bank transfers, which is a pain point for
merchants. Under normal circumstances, once you have cash, it is yours,
it is under your control, and you can transfer it again immediately to
somebody else. The transfer of physical money immediately extinguishes
a financial obligation and leaves nobody waiting for anything else.
But there is a big problem with traditional physical cash: it doesn’t work
at a distance. Unless you carry it in person, you can’t transfer physical
cash to someone on the other side of the room, let alone on the other side
of the planet. This is where digital money becomes highly useful.
Digital money differs from physical money in that it relies on
bookkeepers who are trusted by their customers to keep accurate
accounts of balances they hold. To put it another way, you can’t own and
directly control digital money yourself (well, you couldn’t until Bitcoin
came along, but more on that later). To own digital money, you must
open an account somewhere with someone else—a bank, PayPal, an ewallet.
The ‘someone else’ is a third party whom you trust to keep books
and records of how much money you have with them—or, more
specifically, how much they must pay you on demand or transfer to
someone else at your request. Your account with a third party is a record
of an agreement of trust between you: simultaneously how much you
of an agreement of trust between you: simultaneously how much you
have with them, and how much they owe you.
Without the third party, you would need to keep bilateral records of debts
with everyone, even people who you may not trust or who may not trust
you, and this is not feasible. For example, if you bought something online,
you could attempt to send the merchant an email saying ‘I owe you $50,
so let’s both record this debt’. But the merchant probably wouldn’t accept
this; firstly, because they probably have no reason to trust you, and
secondly, because your email is not very useful to the merchant—they
can’t use your email to pay their staff or suppliers.
Instead, you instruct your bank to pay the merchant, and your bank does
this by reducing how much your bank owes you, and, at the other end,
increasing how much the merchant’s bank owes them. From the
merchant’s point of view, this extinguishes your debt to the merchant,
and replaces it with a debt from their bank. The merchant is happy, as
they trust their bank (well, more than they trust you), and they can use
the balance in their bank account to do other useful things.
Unlike cash, which settles using the transfer of physical tokens, digital
money settles by increasing and decreasing balances in accounts held by
trusted intermediaries. This probably seems obvious, though you may not
have thought of it this way. We’ll come back to this later, as bitcoins are a
form of digital money which share some properties of physical cash.
There is a big difference between online card payments, where you type
the numbers, and physical card payments, where you tap or swipe the
physical card. In the industry, an online credit card payment is known as
a ‘card not present’ transaction, and swiping your card at the cashier’s till
in a shop counts as a ‘card present’ transaction. Online (card not present)
transactions have higher rates of fraud, so in an effort to make fraud
harder, you need to provide more details—such as your address and the
three digits on the back of the card. Merchants are charged higher fees for
these types of payments to offset the cost of fraud prevention and the
losses from fraud.
Cash is an anonymous bearer asset which does not record or contain
identity information, unlike many forms of digital money that by law
require personal identification. To open an account with a bank, wallet,
or other trusted third party, regulations require that the third party can
identify you. This is why you often need to supply information about
yourself, with independent evidence to back that up. Usually that means a
photo ID to match name and face, and a utility bill or other ‘official’
registered communication (for example from a government department)
to validate your address. Identity information is not just collected when
opening accounts. It is also collected and used for validation purposes
when some electronic payments are made: when you pay online using a
credit or debit card you need to supply your name and address as a first
gateway against fraud.
There are exceptions to this identity rule. There are some stored value
cards that don’t require identity, for example public transport cards in
many countries, or low-limit cash cards used in some countries.
Do payments need to be linked to identity? Of course not. Cash proves
this. But should they? This is a big question that raises legal,
philosophical and ethical issues that remain subject to ongoing debate.
Credit card information is frequently stolen, along with personally
identifying information (name, addresses, etc) which creates a cost to
Is it a fundamental right to be able to make payments which are shielded
from the eyes of the state governments? And should people have the
ability to make anonymous digital payments, as they do with physical
cash? To what extent should our financial transactions be anonymous or,
cash? To what extent should our financial transactions be anonymous or,
at the very least, private? And what, if any, are the reasonable limits to
that privacy? Should the public sector or the private sector provide the
means for electronic payments and financial privacy? Should a nation
state be able to block an individual’s ability to make digital payments, and
with what limits? How can we reconcile financial privacy with the
prevention of support for illegal activities, including the funding of
terrorism? I won’t provide answers to these big questions in this book,
but the fundamental questions concerning financial privacy are inevitably
raised when understanding the game-changing innovation that is Bitcoin.

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