The disruptive potential of tokens and blockchains initially surfaced with payments thanks to the controversy over and curiosity about their application in Bitcoin. But these two technologies could have much broader application. As explained in the companion article “Thinking Outside the Blocks,” blockchains and digital tokens establish digital continuity. The technologies can undergird any number of applications that bring together many different parties that often have no reason to trust one another. They can eliminate duplicative and error-prone transactions, and they can help create digital identity.
Assuming (and it is a big assumption) that the tradeoffs among security, functionality, and scale will be largely resolved within five years, a range of radically new blockchain applications are possible. Here are seven potential killer apps.
TRANSFORMING THE ECONOMICS OF DIGITAL CONTENT. Today, internet content is funded by either subscription or advertising. But with cheap, blockchain-based transactions, it would be possible to meter media consumption by the page or the minute. Especially if consumers’ privacy concerns intensify, blockchain could drive a fundamental shift in the revenue models of the online media industry.
An extension of this idea is using a blockchain to register and protect intellectual property. In October 2015, Imogen Heap, the British singer and songwriter, released her song “Tiny Human” on the Ethereum blockchain as a smart contract. It allowed fans to download, stream, remix, and sync the song, distributing royalties directly to the creators—and entirely bypassing the complex and costly web of music intermediaries.
GUARANTEEING DIGITAL IDENTITIES. Governments (or some broad coalition of service providers) can play a crucial role by giving their citizens digital identities, thereby enhancing peripheral trust in all peer-to-peer transactions. A digital identity would be data with provable ancestry from the authority, universally verifiable, just like a bitcoin. It is not obvious that such data would need to be stored on a blockchain. Citizens could create public/private-key combinations to release selected personal data to specific recipients. Thus, a young person could prove that he or she is old enough to purchase liquor without revealing other, irrelevant information, as with a driver’s license. Over time, legally binding digital signatures, passports, licenses, security passes, key cards, certificates, log-ins, ownership documentation, voter registration, and a panoply of other legal information could be built on that foundation.
The most ambitious step in this direction is the AADHAAR national-identity scheme, which has enrolled over a billion citizens in India. Visionaries see an entire “India stack” built on this foundation, possibly extending into payments for the unbanked.
STREAMLINING HEALTH CARE AND REVOLUTIONIZING RESEARCH. Health care is characterized by duplicative, incompatible, and inconsistent medical records, while patient data is subject to stringent security and privacy requirements—a perfect application for a permissioned blockchain. But visionaries are looking beyond simple data sharing to “precision medicine”: a continuously learning health care system built on electronic health records, data analytics, and universal disease registries. These new systems will record patient data (and ultimately, complete genomic maps), symptoms, treatments, and above all, outcomes.
The central challenge in designing such systems is to reconcile patients’ privacy with researchers’ need for granular and universal data sets. Mere anonymization does not work.
MINTING DIGITAL FIAT CURRENCY.At least a half-dozen central banks are considering this step. The Bank of England, say, would mint “bit£” as digital bearer instruments. Unlike bitcoin, bit£ would have a fixed value and be backed by the full faith and credit of the government. The central bank would purchase government securities with bit£ through an interbank-permissioned blockchain. Commercial banks would then use the bit£ on their balance sheets to settle interbank obligations, massively reducing the counterparty risks that brought the financial system to the brink of collapse in 2008. Over time, access to bit£ could be extended, ultimately to all citizens. Bit£ would then displace physical cash and much of the traditional payments settlement function of commercial banks.
Bitcoin itself would be disrupted by bit£, a universally acceptable, zero-risk competitor. Regulatory and compliance costs would be substantially reduced across the financial system. A recent Bank of England study even concluded that macroeconomic policy would be easier to administer (bit£ could pay a negative interest rate, for example) and that such a regime could permanently raise GDP by as much as 3% by lowering real interest rates, distortionary taxes, and transactioncosts.
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