The Future of Money

A payment without a branch

In an African market, a woman buys rice, soap and a phone top-up. She does not open a wallet, does not hand over banknotes, does not sign receipts. Having dictated the number, she confirms on the phone, waits for the message, and the seller nods. The payment is over before the conversation is. Neither of them has seen a bank; perhaps neither has ever had a banking relationship in the traditional European or American sense of the term. And yet both have performed a perfectly modern monetary act: they have moved value through a digital infrastructure, inside a system of identities, registers, commissions, agents, rules and trust.

This scene, now ordinary in many economies, is more important than it seems. For centuries full access to modern money passed through heavy institutions: a mint, a bank, an administrative state, a current account, a network of branches, documents, signatures, archives. In many parts of the world, however, mass digital money has not arrived at the end of a long expansion of banking: it has partly preceded it. The phone has become branch, wallet, practical identity, receipt. This does not mean that poverty has been solved by an application, nor that digital finance is an innocent promise. It means something more circumscribed and more profound: the future of money does not advance everywhere along the same line. In some places digital replaces cash; in others it replaces the bank that was not there; in others still it strengthens banks, platforms and states that are already very powerful.

The book closes here not because the history of money has reached a conclusion, but because it has reached the point where forms become simultaneous. In the same present, banknotes, bank deposits, cards, mobile wallets, stablecoins, decentralised cryptocurrencies, central bank reserves, tokenised public securities, global private networks and projects for central bank digital currencies all coexist. The old narrative sequence - clay, metal, paper, bank, state, code - does not disappear, but folds back on itself. Each layer continues to live inside the next. Cash persists beside instant payments; sovereign debt underpins the reserves of the global system while code promises to reinvent trust; the dollar remains dominant while de-dollarisation is discussed; central banks defend public money precisely as they make it programmable.

This interweaving makes every single story insufficient. In northern Europe the future may appear as an almost cashless society, where the main question is protecting privacy and resilience in an already banked environment. In some African or Asian economies it may appear as financial access through phones and local agents, with the opposite problem: building rights, competition and consumer protection where digital infrastructure often precedes full banking citizenship. In the United States it may appear as competition among private networks, banks, dollar stablecoins and the caution of the central bank. In the euro area it may appear as an attempt to preserve monetary sovereignty and payment autonomy inside an integrated market that still depends also on infrastructures outside the euro area. In China it may appear as tight integration among digital payments, platforms and public authority. The word “future” therefore covers very different geographies of trust.

For this reason, speaking of the future of money requires caution. Monetary history is full of failed prophecies: the end of gold announced too early, the return of gold announced in vain, the death of cash repeated at every innovation, the end of the dollar predicted many times and always postponed, the replacement of banks promised by every new technology. Money is one of the most conservative institutions that exist precisely because it must be believed. It changes, but it changes by stratifying. A new form does not immediately cancel the previous ones; it surrounds them, modifies them, forces them to justify themselves. Niall Ferguson has shown how financial innovations enlarge the radius of human action while also producing new fragilities [Ferguson 2008]. The future of money should be read in this way: not as a straight line toward a winning technology, but as a field of tensions between efficiency and stability, freedom and control, public and private, state and network, promise and surveillance.

Cash in retreat

The first tendency is the most visible: in many economies cash is retreating. It does not disappear, but it loses centrality in everyday life. Purchases are paid for with cards, phones, watches, QR codes, instant transfers; wages arrive in accounts; public benefits pass through cards or credits; merchants prefer automatic records; consumers become used to not counting coins. The Covid-19 pandemic accelerated habits that were already underway, but it did not create them. The direction was inscribed in the transformation of payments: more speed, less friction, lower costs of physical handling, more integration between commerce and data.

Cash, however, is not merely an outdated means of payment. It is also a civil technology. It is simple, it works without electricity at the moment of exchange, it does not require an account, it does not expose every small purchase to a chain of intermediaries, it allows a degree of anonymity, it is immediately final: when the banknote changes hands, the payment has occurred. For this reason its retreat cannot be described only as progress. In an entirely digital world, whoever controls the payment infrastructure sees much more, can block much more, can exclude much more. Cash is inefficient for many modern uses, but precisely its roughness makes it resistant.

Its value emerges above all when something breaks. A blackout, a cyberattack, an interruption in telecommunications, a banking crisis, a war, a natural disaster: in each of these cases monetary redundancy can become essential. A society that preserves several payment channels is less elegant, but more robust. Cash is a form of redundancy. It costs money to produce, transport, store and defend from counterfeiting; but its cost buys a property that no digital infrastructure possesses in the same way: the capacity to function locally without querying a remote register at the moment of exchange. This is not enough to make it the centre of the future, but it is enough to prevent its disappearance from being treated as a merely technical matter.

The question is therefore not whether cash will die, but what residual function it will retain. In some economies it will continue to be essential for small payments, emergencies, elderly people, informal workers, areas with weak connectivity. In others it will become a constitutional guarantee more than a dominant means: the sign that the citizen preserves access to public money even without passing through a private intermediary. In others still it may decline until it becomes marginal, with real risks for inclusion and privacy. History teaches that the material medium of money is never neutral. Gold money constrained the sovereign, but imposed painful deflations; the banknote freed the state, but opened the way to inflation; digital payment frees us from the weight of paper, but creates dependence on networks and data.

Here the book on money meets the companion book on measurement. To pay is to measure value and transfer it. But measurement is not innocent: every system of measurement incorporates an authority, a scale, a way of making different things comparable. Digital money makes the measurement of value continuous, instantaneous, recordable. A purchase is no longer only a passage of purchasing power; it is a datum, a signal, an event that can feed profiles, anti-fraud systems, advertising, risk assessments, tax controls. Money becomes not only a unit of account, but a unit of observation.

The most recent surveys on financial inclusion show that phone, connectivity and digital financial services are now intertwined in access to money, especially in low- and middle-income economies. The World Bank’s Global Findex 2025, based on surveys in 141 economies, indicates that 79% of adults now have a financial account and links this growth also to the spread of mobile phones and digital services [Klapper et al. 2025] . This fact is decisive: the future of money is not only the laboratory of central banks or cryptocurrencies, but the daily life of billions of people for whom the entry door into monetary modernity is no longer the bank branch. It is the phone. And the phone, unlike the banknote, is always also a device of identification, localisation and relation with platforms.

Platforms, stablecoins and private money

A second tendency concerns the growth of private power in payments. For a long time the modern monetary system functioned as a hierarchy: at the top the central bank, below it the commercial banks, then customers and means of payment. Cards, international networks and technological platforms have made this hierarchy more complex. Today an enormous share of the everyday experience of money passes through private companies that do not necessarily issue money, but control access, interface, data, convenience. Citizens do not think of the central bank when paying; they think of the app that works or does not work.

This shift is subtle. The state may preserve the monopoly of the unit of account - euro, dollar, pound, yen - and nevertheless lose influence over the concrete experience of payment. If everyone uses a private platform to pay, receive, send, defer, invest, public money remains the language, but the daily grammar is written elsewhere. Commissions, priorities, exclusions, data collected, risk policies, visibility of merchants, access to credit can depend on enterprises whose purpose is not monetary stability, but profit, growth, control of the ecosystem.

The platform does not merely transport the payment: it interprets it. It knows where, when, how often and with whom we pay; it can connect the payment to the seller’s reputation, the probability of fraud, advertising, consumer credit, logistics, risk scoring. In the past payment left traces, but dispersed ones: a receipt, an accounting register, a bank statement. In the digital future traces can be unified and made operational in real time. Money becomes a social sensor. This capacity can reduce fraud and costs, but it can also transform the market into a system of permanent observation. The new monetary power does not consist only in issuing units of account; it consists in governing the data generated by their movement.

Stablecoins have made this tension still more explicit. Unlike Bitcoin, which floats freely and claims a scarcity of its own, stablecoins promise to maintain a stable value against an existing currency, often the dollar. Their strength does not lie in replacing the dominant unit of account, but in carrying it into programmable and cross-border digital networks. In this sense they are less revolutionary than they seem and more destabilising than they appear: they do not attack the dollar frontally, they often extend it; they do not eliminate trust, they move it toward the issuer, the reserves, the intermediaries, regulation, the quality of the assets that should guarantee the peg.

History offers an immediate parallel: private banknotes and bank deposits. There too private actors issued promises convertible into something more solid; there too trust depended on the quality of the reserves and the credibility of the issuer; there too crises arose when many demanded conversion at the same time. Modern banking was, in large part, the history of how the state and the central bank disciplined these private promises without eliminating them. Stablecoins raise the problem again in digital form: how much private money can circulate on top of a public base? With what reserves? With what supervision? With what responsibility when the promise of stability breaks?

The previous chapter showed how Bitcoin posed the problem of trust without an intermediary [Nakamoto 2008] . Stablecoins pose a different problem: trust in a private intermediary that uses the prestige of a public currency. For this reason they attract both enthusiasm and suspicion. They can make payments and transfers faster, especially where banking systems are slow or costly; they can also favour flight from weak currencies, evasion of controls, concentration of power in a few issuers, new runs on liquidity. They are not simply domesticated cryptocurrencies. They are a new chapter in the old history of private promises denominated in public money.

The Bank for International Settlements, in its recent reports, insists on one idea: the digital monetary future should not abandon the anchor of central bank money, but should build tokenised platforms in which public reserves, bank money and government securities can interact in a programmable way [BIS 2025] . It is an institutional vision of the future: not the anarchic triumph of networks without a centre, but a new architecture in which code makes the old heart of the system more efficient. This too is an answer to the question of the book. Trust, according to this vision, can become programmable only if it remains anchored to a credible public institution.

Central banks seek a digital form

The third tendency is the public response: central bank digital currencies. We have already seen their meaning in the previous chapter. Here what matters is to grasp their role in the broader future of money. A CBDC is not inevitable; not all central banks will issue one; not all will issue it in the same form. But the fact that so many are studying it reveals a common concern: that public money, if it remains confined to physical cash and bank reserves, may lose presence in the daily life of a digital society [Illes et al. 2025] .

The problem is ancient in a new form. In the two-tier system, the public mainly uses private bank money - deposits - while the central bank provides the ultimate anchor: cash for everyone, reserves for banks, lender of last resort, price stability. So long as cash is used and recognised, the citizen has a direct relationship, however modest, with central bank money. If cash declines until it almost disappears, that relationship thins. A retail CBDC would be an attempt to rebuild it in digital form: public money spendable online, perhaps through private intermediaries, but directly guaranteed by the monetary authority [BIS 2021] .

Supporters see here a way to preserve monetary sovereignty, promote competition in payments, reduce costs, foster inclusion, prepare more resilient infrastructures. Critics see risks of surveillance, bank disintermediation, cyber fragilities, political use of programmable money. Both have reasons to be considered. A CBDC can be designed in very different ways: more or less anonymous, more or less intermediated, with holding limits or without, remunerated or not remunerated, accessible offline or only online, oriented to retail or wholesale payments. A single word hides multiple architectures.

The distinction between retail and wholesale CBDCs is particularly important. A wholesale CBDC would concern above all banks and financial intermediaries: a new form of settlement among institutions, perhaps useful for tokenised markets and cross-border payments. It would touch the experience of the ordinary citizen little. A retail CBDC, by contrast, would potentially enter everyone’s wallet. It is this second hypothesis that raises the most sensitive questions: what relationship would it have with bank deposits? Who would manage the interface with the public? What data would the central bank see, what would intermediaries see, what would the fiscal state see? Would it be possible to use it offline? Would it have quantitative limits? Could it bear interest? Apparently technical questions, but in reality constitutional ones.

Europe has linked the digital euro project to the idea of a complement to cash and of greater autonomy in payments, moving in 2025 toward a phase of technical preparation; the United States has maintained greater caution, with the Federal Reserve stating that it has not decided whether to issue a digital dollar; other jurisdictions are experimenting with different models, often driven by needs of inclusion, efficiency or control of flows [ECB 2025] [Federal Reserve 2026] . The point, for our narrative, is not to establish which project will succeed. It is to observe that the state is trying to translate its monetary function into the language of digital infrastructure. Sovereignty, in the twenty-first century, is not only the capacity to issue banknotes. It is the capacity to guarantee payment networks, identity, cybersecurity, interoperability, data protection.

Here emerges the most delicate dilemma of the entire monetary future: the relationship between freedom and traceability. Cash enables illicit uses, but it also protects legitimate spaces of privacy. Digital systems allow controls against fraud, tax evasion, money laundering, criminal financing; but the same capacity to see can become a capacity to discipline. Programmable money can execute conditional transfers, automate taxes, prevent forbidden uses, distribute aid with precision. It can also make every economic gesture reversible, limitable or surveillable. The question is not whether technology can do it. It can. The question is what political and legal limits a society will want to impose on the power to do it.

The future of digital public money will therefore depend less on pure technical elegance than on institutional trust. In countries where citizens believe that institutions respect limits, rights and procedures, a CBDC may be perceived as public infrastructure. Where the state is feared, it may be perceived as an instrument of control. The same code does not produce the same political meaning everywhere. This is a recurring lesson of monetary history: the technical form of money matters, but its credibility depends on the regime of trust in which it is immersed.

The dollar and the desire to leave it

The fourth tendency concerns international money. Every age has had its dominant unit: the real de a ocho in the age of silver, sterling in the nineteenth century, the dollar after Bretton Woods and, even more, after the end of convertibility into gold. The supremacy of the dollar does not mean that the whole world uses dollars to buy bread; it means that a decisive part of international trade, foreign exchange reserves, debt, commodities and global finance is denominated or settled in dollars. Barry Eichengreen has shown how international monetary regimes depend on an unstable balance among economic power, institutions, markets and political choices [Eichengreen 2008]. The dollar is the centre of this contemporary balance.

For decades there has been talk of its possible erosion. The reasons are understandable. The United States can finance deficits in a currency that the rest of the world demands; American financial sanctions show how much geopolitical power passes through payment infrastructures and reserves; many countries do not want to depend on a single currency, a single correspondent banking system, a single jurisdiction. De-dollarisation is therefore at once an economic desire and a political project: reducing vulnerability, diversifying reserves, trading in local currencies, building alternative circuits.

The power of the dollar, however, does not live only in banknotes or official reserves. It lives in the invoices of international trade, in financing contracts, in derivatives markets, in quoted commodities, in corporate balance sheets, in the habits of treasurers, in the depth of the Treasury market, in the conviction that in times of panic the dollar is still the most liquid refuge. This creates a network effect: the dollar is used because others use it, and precisely because others use it, it remains rational to continue using it. Breaking a monetary network effect requires more than a political decision. It requires an alternative ecosystem deep enough to function even in moments of fear, not only in diplomatic communiques.

But the desire to leave the dollar is not enough to create a substitute. A dominant international money must offer deep markets, liquidity, legal security, financial openness, instruments in which to park reserves, trust in convertibility, institutional predictability. It is not enough for a country to be large; it must also offer to the rest of the world financial assets that are credible and accessible. Sterling did not lose its role in a day, and the dollar did not acquire its role by decree alone. International currencies change when the structures of economic power change, but also when there exist financial infrastructures capable of absorbing the change.

For this reason the figures on the composition of reserves must be read with prudence. Statistics from the International Monetary Fund show a dollar share lower than in the past, but still dominant: in the fourth quarter of 2025 the dollar accounted for just under 57% of allocated foreign exchange reserves, while the euro remained around one fifth [IMF 2026] . Reading the same data over a longer arc, the Federal Reserve notes that the dollar’s share has fallen from its early-2000s peak but remains far above that of any other currency [Federal Reserve 2025] . The long-term trajectory may indicate gradual diversification, not necessarily collapse. The difference is essential: one thing is a more multipolar system, in which dollar, euro, renminbi, gold, regional currencies and digital instruments coexist in different proportions; another is the sudden end of the dollar’s hegemony. Monetary history invites us to distrust rapid apocalypses.

Digital technologies can accelerate some aspects of diversification, but they cannot abolish the fundamental requirements of trust. A cross-border payment can become faster; a platform can reduce intermediaries; a wholesale CBDC can simplify settlement among banks; a stablecoin can carry digital dollars into otherwise difficult markets. But the question remains: in what unit is value measured? Which public debt functions as a safe reserve? Which jurisdiction protects rights? Which central bank intervenes in a crisis? Technology modifies channels; it does not automatically create the institutional depth that supports a world money.

The future may therefore not be replacement, but fragmentation. Less a new universal monetary sovereign than a plurality of circuits: the dollar still central in many functions, regional currencies used more in certain exchanges, gold revalued as a political reserve, dollar stablecoins used in economies with fragile currencies, interoperable CBDCs in experimentation, alternative payment systems used for geopolitical reasons. A fragmentation of this kind could reduce some dependencies and create others. Here too the question is not only which currency will win, but which architecture will make it possible to trust strangers across borders.

The debt the future inherits

Beneath all these innovations runs a heavier continuity: debt. The future of money will not be decided only by code, phones and digital central banks, but also by the mass of promises accumulated by states and private actors. Debt is the bridge between present and future: it allows resources that will be produced tomorrow to be spent today, but it binds tomorrow to decisions already taken. William Goetzmann has described finance as a technology of time [Goetzmann 2016]. Debt is its most explicit form: a dated promise, a future committed.

In the last chapters we saw how sovereign debt is at once an instrument of state-building and a recurring source of crises. Reinhart and Rogoff have gathered a long history of defaults, restructurings, inflations and illusions of immunity [Reinhart & Rogoff 2009]. This history weighs on the present because many countries enter the digital age with public balance sheets burdened by social spending, ageing, defence, energy transition, interest, the legacies of financial and pandemic crises. The monetary future will not be born in a clean vacuum; it will be born in states that must refinance debts, maintain market trust, avoid inflation and at the same time respond to growing social pressures.

The most recent estimates of the International Monetary Fund place global public debt at historically high levels: the April 2026 Fiscal Monitor estimates global public debt at just under 94% of GDP in 2025 and projects it toward 100% by 2029 [IMF 2026] . The Global Debt Monitor 2025, looking at total public and private debt, places it above 235% of world GDP [IMF 2025] . Even without assuming a magic threshold beyond which everything collapses, the problem is evident: the higher the debt, the more the system depends on rates, growth, inflation and trust. If rates remain high, debt service absorbs resources; if growth slows, the debt-to-output ratio worsens; if inflation is used to lighten the real burden, creditors demand protection; if austerity is chosen, social conflict grows. No monetary technology cancels this political arithmetic.

Future debt also has a different quality from that of many past ages: it is intertwined with demographic, climatic and geopolitical commitments of long duration. Ageing societies must finance pensions and health care; those exposed to climate change must invest in adaptation and reconstruction; those immersed in a more conflictual international order increase security spending; those that want faster energy and industrial transitions ask the state to direct capital. All this may be necessary, but it is not free. The money of the future will have to coexist with states that ask for credit to protect the future and, precisely by doing so, burden it with new promises.

Indeed, digital money can make some dilemmas sharper. More efficient payments can improve tax collection; richer data can make subsidies and controls more targeted; programmable money can allow rapid interventions. But the same instruments can increase the temptation to govern society through monetary infrastructure, moving political conflicts into technical rules. If an indebted state had a perfectly traceable and programmable digital currency, what uses would it make of it in a crisis? Would it accelerate aid, fight evasion, impose capital controls, limit certain transfers? The answers would depend on the political regime, the legal culture, public trust.

Debt reminds us, in any case, that money remains promise. Cryptocurrencies can promise scarcity without debt; CBDCs can promise public safety; platforms can promise speed; the dollar can promise global liquidity. But states continue to finance the present by selling securities that commit the future. The digital world does not abolish this structure; perhaps it makes it faster, more visible, more interconnected. The old problem of the book - who guarantees the promise? - returns in its most concrete form: who will pay the promises already made?

Who will write the rules

All tendencies converge on a political question: who will write the rules of future money? States, because they control legal tender, taxes, central banks, supervision, sanctions. Banks, because they transform credit into spendable money and know the payments system from within. Private platforms, because they control interfaces, data and habits. Decentralised networks, because they show that a community can coordinate around a protocol without a traditional centre. International organisations, because payments do not stop at borders. None of these actors will disappear. The future of money will probably be a permanent negotiation among them.

This negotiation will not take place in a world parliament. It will take place through technical standards, licences, capital requirements, interoperability protocols, lawsuits, crises, failures, consumer habits, the choices of large enterprises, geopolitical pressures. Many decisive decisions will seem small: what format for a digital identity, what limit for a wallet, what requirement for the reserves of a stablecoin, what access to settlement infrastructures, what liability for a fraudulent payment, what possibility of carrying one’s data from one platform to another. Monetary history teaches that these minute architectures then become institutional destiny. The gold standard too was made of technical rules; the modern central bank too was born from specific practices before becoming theory.

The word “programmable” expresses the stakes well. Programmable money is not simply money that travels on computers: all electronic money already does. It is money in which conditions, identities, limits, authorisations and transfer logics can be incorporated directly into the payment infrastructure. In minimal form, this programmability already exists: card limits, anti-fraud controls, anti-money-laundering blocks, automatic debits. In a more extended form, it could mean contracts that execute themselves, public payments bound to certain uses, instant settlements among tokenised assets, money with expiry dates or restrictions. Every passage promises efficiency; every passage asks for guarantees.

Economic freedom does not consist in the absence of monetary rules: no money exists without rules. It consists in those rules being knowable, contestable, limited, proportionate, subject to institutions that do not coincide entirely with those who exercise power. Cash protected part of this freedom through matter; the future will have to protect it through law and technical design. It will not be enough to say that privacy is important; systems will have to be built that incorporate it. It will not be enough to say that crime must be fought; control must be prevented from turning every citizen into a permanent suspect. It will not be enough to say that inclusion is desirable; access will have to be guaranteed also to those who are not profitable for platforms.

In this sense, the future of money is less technological than it seems. The technologies are real and decisive: cryptography, digital identity, distributed ledgers, artificial intelligence in controls, tokenisation, instant payments. But the social form they assume will depend on institutional choices. The same infrastructure can be designed to minimise data or to maximise it, to open competition or to close ecosystems, to guarantee portability or to create dependence, to allow public audits or to impose private opacity. As always, money reveals the deep constitution of a society.

This is why the dispute between supporters and critics of cryptocurrencies, between advocates and opponents of CBDCs, between defenders of cash and promoters of the digital, should not be reduced to caricature. Those who fear the power of digital central banks grasp a real risk; those who fear the instability of unregulated private monies grasp a real risk; those who want more efficient payments grasp a real need; those who defend spaces of anonymity grasp a real freedom. The task is not to choose a slogan, but to recognise that every monetary architecture distributes power.

The promise among strangers

We started, in the first chapter, from an apparently simple question: what comes before money? The answer led us to debt, to the social memory of obligations, to the tablets that made visible who owed what to whom. From there we followed coined metal, the seal of the sovereign, interest condemned and then legitimised, Renaissance banks, global silver, paper, bubbles, central banks, gold, fiat money, inflation, debt crises, code. Each passage seemed to replace the previous one; in reality it reinterpreted it.

Money has been commodity, sign, credit, debt, law, expectation, memory, infrastructure. It has taken the form of barley, silver, gold, paper, the number in a register, the packet of data. But its deepest function has remained constant: allowing strangers to coordinate through time. Whoever accepts money accepts a promise that cannot be entirely verified alone. They trust that someone else will accept it, that an authority or a network will recognise it, that its value will not evaporate before it is spent, that the debt can be settled, that the register will not be erased. Money is portable trust.

For this reason no monetary form is definitive. Every solution produces its own problem. Metal gives discipline but limits the response to crises; paper gives elasticity but exposes to abuse; banking creates credit but generates panics; the central bank stabilises but concentrates power; fiat frees from gold but depends on credibility; code reduces some intermediaries but creates others; programmability increases efficiency but threatens freedom. History does not proceed toward a perfect money. It proceeds through compromises.

The future of money will probably be plural. We will continue to live with several overlapping forms of money: public and private, national and international, physical and digital, centralised and decentralised, stable and volatile, regulated and experimental. The decisive question will not be which medium will win, but which combination of media will maintain enough trust without concentrating too much power; enough efficiency without sacrificing too much freedom; enough innovation without forgetting the lessons of crises.

Here the bridge with measurement becomes explicit. To measure means to make comparable; to monetise means to make exchangeable. Both operations build trust among strangers. A shared metre allows those who build and those who buy to agree on a length; a shared money allows those who sell and those who buy to agree on a value. But neither measurement nor money is a purely technical convention. They are public promises: they promise that the metre will be the same tomorrow, that the unit of account will still hold, that the register will be respected, that whoever controls the standard will not bend it arbitrarily.

From the barley grain to programmable money, value has seemed to arise increasingly from nothing. In reality it arises from something invisible but not non-existent: organised trust. The nothing of the title is not empty; it is the network of institutions, memories, laws, habits, fears, hopes and calculations that makes a sign credible. Money is not less real because it is a promise. A promise too can build cities, finance wars, save banks, ruin families, open trade, measure wages, move power. The question is not whether we will live without monetary promises. We cannot. The question is which promises we will accept, from whom, with what limits, and what we will be willing to sacrifice so that others continue to believe them.

History does not end with code. Code is only the latest language in which the old promise is written. So long as exchange, debt and future exist, someone will still have to make it credible. This, more than any medium, is the true matter of money.