The excitement has been underpinned by regulators and mainstream financial companies that are trying to make cryptocurrencies safer and more accessible. The Office of the Comptroller of the Currency, a US regulator, said this summer that banks would be allowed to hold cryptocurrencies for customers. And PayPal announced in October that it would follow its rival Square and allow people to buy and hold Bitcoin and a few other cryptocurrencies.
"Our move came as a result of conversations with government officials, and then seeing the dramatic shift into digital payments as a result of the pandemic," Dan Schulman, chief executive of PayPal, said in an interview. More than 1 million people — three to four times what the company expected — joined a waitlist to use cryptocurrencies before the feature was started, he said.
Bitcoin's rise is part of a broader exuberance in cryptocurrencies and stock markets, which are defying the gloom of a pandemic-induced recession. The Dow, S&P 500 and Nasdaq have hit record highs in November, with Wall Street buoyed by the presidential election and the news of potential coronavirus vaccines.
Bitcoin is a digital currency with software and rules that were released in early 2009 by a shadowy creator with the pseudonym Satoshi Nakamoto. The computer code established that the total supply of Bitcoin would be limited. Only 21 million tokens will ever be created, distributed in small blocks each day — through a process known as mining — to some of the computers that maintain the currency's online infrastructure.
Like gold, Bitcoin can be created, moved and stored outside the purview of any government or financial institution. Bitcoins exist on a financial ledger, known as a blockchain, which is maintained and updated by a volunteer network of people running thousands of computers worldwide — a system meant to ensure that no one computer or institution can change the rules or control the network.
The open nature of the system — and the fact that anyone can join it and create a wallet without providing so much as a name or a phone number — has made it popular for those who want to circumvent the traditional financial system. They have included terrorists, drug dealers and countries, like North Korea, Venezuela and Iran, that want to evade U.S. financial sanctions.
"This technology already plays a role in many of the most significant criminal and national security threats our nation faces," the Department of Justice said in a report in October. The report described how deeply Bitcoin had been woven into the infrastructure of the criminal world.
But Bitcoin's stateless nature has also won over investors interested in legitimate uses of the technology. Some have been motivated by a libertarian distrust of governments. Others who are less ideological have gravitated to Bitcoin as an alternative to the financial system.
Still, Bitcoin is not backed by anything other than its computer network and the faith of people who buy it and give it value on exchanges. Many of these people are betting that someone else will be willing to pay them more for their Bitcoin in the future.
That has made Bitcoin prices volatile. It fell to its most recent low in March when fear over the pandemic hit global markets. Soon after, though, investors began talking about Bitcoin as a beneficiary of the global downturn.
In May, Paul Tudor Jones, one of Wall Street's best-known hedge fund managers, said he had put almost 2 per cent of his portfolio in Bitcoin. He said the cap on Bitcoin production made it an attractive alternative to the declining value of traditional currencies, which he thought was inevitable as central banks printed more money to encourage an economic recovery.
"Every day that goes by that Bitcoin survives, the trust in it will go up," Jones told CNBC at the time. He did not respond to a request for comment for this article.
Some public companies also dived into Bitcoin because of concerns about the value of the dollar. In August, MicroStrategy, a software company in Virginia, said it bought US$250 million of Bitcoin to store some of the cash it had in the corporate treasury.
Michael Saylor, MicroStrategy's chief executive, said in an interview that after knowing almost nothing about Bitcoin at the beginning of this year, he had become a believer in how the hard-coded limit on the number of tokens would help it hold its value over time. He became so enthusiastic that he put US$175 million of his own money into the currency. MicroStrategy later bought another US$175 million of Bitcoin.
"For anything that anybody invested in as a store of value, it starts to look like it is better to move that into Bitcoin," Saylor said.
In October, Square said it was putting US$50 million of its corporate cash into Bitcoin. In 2018, Square also began offering the digital currency on the Cash App, its phone app that people use to send money between friends and family. In November, the company, which is led by Jack Dorsey, who is also chief executive of Twitter, said its customers held US$1.8 billion of Bitcoin, up 180 per cent from a year ago.
In October, analysts at JPMorgan Chase wrote a widely circulated note about how using Bitcoin as an alternative to gold — especially by younger investors — was creating a significant market for the tokens. Given that the total value of all outstanding Bitcoin, around US$350 billion, was a small fraction of all the gold in the world, the analysts said they could see the value of Bitcoin going much higher.
Bitcoin's rally has been accompanied by a broader bull market in cryptocurrencies, just as in 2017. While much of the fervour three years ago centered on new coins from scammy so-called initial coin offerings, interest has shifted to coins trying to take part in what is known as decentralised finance, or DeFi. These systems, which remain buggy and unproven, aim to make it possible to take out loans and insurance or collect interest without involving any financial institutions.
Central banks from countries such as Singapore, Sweden and the Bahamas are also looking at creating national digital currencies, inspired partly by Bitcoin. The biggest project, from China's central bank, appears to be the furthest along.
The national coins, which would leave behind the volatility of Bitcoin, could make cryptocurrencies obsolete. But they could also make it easier to move in and out of digital currencies of all kinds.
Given the uncertainty around Bitcoin's value, any excitement is likely to be followed by another contraction. But the number of crashes Bitcoin has survived is changing the conversation around the technology.
"Now it's LeBron James playing at age 21 and starting to dominate the court," Saylor said. "It's not LeBron James, age 13, throwing a temper tantrum. You've got a hardening and a maturing of the asset."
Written by: Nathaniel Popper
© 2020 THE NEW YORK TIMES