One of our goals at the Digital Currency Initiative is to harden the security of cryptocurrency networks. Most users of cryptocurrency take the actual network protocol and all of its implementation — mining, pools, validation, messaging, and more — for granted, and aren’t necessarily aware of all the ways these mechanisms might be attacked or fail. For example, though mining pools are a huge part of Bitcoin’s network security, there isn’t any available public monitoring to make sure that mining pools are well-behaved. There isn’t even a standard way to look at what pool operators are doing or infrastructure to keep tabs on pool operators.
Read MoreDCI will be collaborating with the Federal Reserve Bank of Boston to build a hypothetical digital currency. We are hiring a software engineer and there will also be opportunities for MIT UROPs and graduate researchers.
Read MoreAn article by Alyssa Hertig published on July 28th, 2020. coindesk.com
“The infrastructure propping up Bitcoin might become easier for anyone to spin up and run.
Lightning creator Tadge Dryja has been working on a new design for a lighter weight Bitcoin full node, about which he first wrote a paper in 2019. Last week, he and a team of coders released a first version of the Utreexo software as a part of MIT Digital Currency Initiative (DCI), putting the idea of lighter nodes into working code.
Full Bitcoin nodes act like financial security systems, validating Bitcoin blockchain transactions and protecting users from being tricked into thinking they received money that they didn’t. But they take up a lot of computing space and are quickly growing in size.
Since these nodes are the most “trustless” way of using Bitcoin, developers have long been trying to make them easier to use. It’s one of Bitcoin’s nerdy “holy grails.”
Read MoreDCI Research Scientist Tadge Dryja released the Utreexo Demonstration today through a Medium post.
“I’m excited to announce the release of the first demonstration of Utreexo. Utreexo is a new scalability technology for Bitcoin, which can make Bitcoin nodes smaller and faster while keeping the same security and privacy as full nodes.”
Read MoreDCI James Lovejoy and Gert-Jaap Glasbergen presented during this past weeks Crypto Economic Security Conference: Unitize Online Event July 6-10th, 2020. Their Proof-of-Work presentation combines Gert-Jaap’s work on Pool Detective and James’s work on 51% Attacks.
Read MoreQuick Take
Bitcoin’s third-ever block halving is set to take place next month
But from a network perspective, what exactly happens?
The cryptocurrency world is abuzz with speculation about the potential impact of next month's bitcoin halving, when for the third time in the network's history, the reward for mining a block will be divided by two.
Much of the discussion revolves around what will happen to the price. But we'll have to wait until after the thing actually happens - around May 12 - to know that. In the meantime, let's explore a different question: What exactly changes under the hood during the halving?
Read MoreThe economic security of Bitcoin and other proof-of-work cryptocurrencies relies on how expensive it is to rewrite the blockchain. If a 51% attack were economically feasible, an attacker could send a transaction to a victim, launch the attack, and then double spend the same coins back to themselves. Satoshi Nakamoto assumed that this would not occur because a majority of miners would find it more lucrative to honestly follow the protocol than to attack the chain, the source of their own mining revenues.
Recent work has shown the cost of attack on a coin can vary widely. This cost depends on factors like the liquidity of hashrate, the impact on coin price, and the length of the required rewrite; under certain circumstances an attack could even be free. As of March 2020 for chains like Bitcoin, miners make large advance investments in mining equipment and are reluctant to rent any significant fraction of the chain’s hashpower, making the cost today likely quite high. Some coins, however, use proof-of-work algorithms for which there is enough new hashrate for rent to cost-effectively launch 51% attacks, and there have been double-spend attackson these coins observed in practice. Using hashrate markets like NiceHash, buyers and sellers can easily find each other. It is now commonly believed that low hashrate coins, coins that are not the largest in their proof-of-work algorithm class, and coins for which there is a liquid hashrate rental market are all susceptible to cheap 51% attacks and are insecure.
In a recent paper titled Double-Spend Counterattacks, we discuss a strategy to prevent 51% attacks in vulnerable proof-of-work based coins: the victim can counterattack. We show that the victim’s ability to rent hashrate and mine on the original chain, overtaking the attacker chain in the event of an attack, can deter the attack from happening at all in equilibrium. The results hold under the following assumptions: (1) the victim suffers a moderate reputational cost to losing that the attacker does not suffer (e.g. exchanges may suffer negative reputation cost if attacked while anonymous attackers do not), and (2) the net cost of attack increases over time (e.g. by coin value dropping or the cost of hashrate rising). While we had no evidence for double-spend counterattacks in the real world at the time we wrote the paper, we recently saw what we think are counterattacks on Bitcoin Gold…
Read MoreFor central bankers, the game changed last summer when Facebook unveiled its proposal for Libra. Many have responded by seriously exploringwhether and how they should issue their own digital money.
Arguably, though, the more fundamental change is more than a decade old. It was Bitcoin that first made it possible to transfer digital value without the need for an intermediary, a model that competes directly with the traditional financial system. The network’s resilience against attackers suggests there is another way of setting up the system.
Last weekend at the MIT Bitcoin Expo held on campus in Cambridge, Massachusetts, I sat down with experts familiar with central banking as well as cryptocurrency. We discussed the practical concerns central bankers should be considering as they begin to design their own digital money systems. One common theme: central bankers have plenty to learn from Bitcoin.
Read MoreProponents say payments with a digital dollar would be faster and easier. Opponents say it would be costly and inefficient.
The nature of money is changing, and central banks around the world are debating whether they need to change with it.
As electronic payments take off and private cryptocurrencies such as bitcoin seek to gain traction, governments are exploring whether to issue digital versions of their national currencies that could be used as a universal form of payment in the way physical cash is today. These conversations gained urgency for some last year when Facebook Inc.announced plans to launch a cryptocurrency called libra, sparking concern that one of the world’s most powerful technology firms could become even more powerful by operating its own digital money.
So far, few countries have implemented a digital currency, though China reportedly is close and several countries have done or plan tests. Considering the dollar’s key role in global markets, should the U.S. commit to such a project?
Proponents say a digital dollar managed on a single network would facilitate faster, cheaper payments and protect the Fed’s ability to conduct monetary policy in a changing world. Opponents say Fed-controlled digital currency would be costlier and less efficient than many expect, and it would harm privacy by giving government the ability to track all dollar spending.
Neha Narula, the director of the Digital Currency Initiative at the Massachusetts Institute of Technology’s Media Lab, makes the case for digitizing the U.S. dollar. Lawrence H. White, a professor of economics at George Mason University and a senior fellow of the Cato Institute’s Center for Monetary and Financial Alternatives, argues against.
Read More“Bitcoin gold, a relatively minor cryptocurrency that split off from the original bitcoin blockchain in late 2017, has suffered a so-called 51% attack resulting in over $72,000 worth of bitcoin gold tokens being double spent.
A 51% attack can occur when malicious cryptocurrency miners take control of tokens' blockchain and is the second time it's now happened to bitcoin gold which saw $18 million worth of bitcoin gold stolen in May 2018.
The price of bitcoin gold, which ranks as the 36th most valuable cryptocurrency according to CoinMarketCap data, jumped following reports of the attack, moving counterintuitively considering the seriousness of an attack of this type and suggesting the market for smaller tokens is still far from maturity…”
Read More“In recent years, there has been a growing interest in using internet and mobile technology to increase access to the voting process. At the same time, computer security experts caution that paper ballots are the only secure means of voting.
Now, MIT researchers are raising another concern: They say they have uncovered security vulnerabilities in a mobile voting application that was used during the 2018 midterm elections in West Virginia. Their security analysis of the application, called Voatz, pinpoints a number of weaknesses, including the opportunity for hackers to alter, stop, or expose how an individual user has voted. Additionally, the researchers found that Voatz’s use of a third-party vendor for voter identification and verification poses potential privacy issues for users.”
Read MoreDCI’s Neha Narula was part of a panel ‘Creating a Credible and Trusted Digital Currency’, Forbes reporter Robert Anzalone covers the story in ‘Crypto Thoughts From Davos: Encouraging, But Beware Unintended Consequences’
Read MoreDCI’s Neha Narula was interviewed by CNBC whilst she was participating at the World Economic Forum in Davos. The article titled ‘Calls for a US ‘digital dollar’ rise as China powers ahead with a digital yuan’ and was published on Jan 23rd 2020.
Read MoreCash is gradually dying out. Will we ever have a digital alternative that offers the same mix of convenience and freedom?
by Mike Orcutt Jan 3, 2020
Think about the last time you used cash. How much did you spend? What did you buy, and from whom? Was it a one-time thing, or was it something you buy regularly?
Was it legal?
If you’d rather keep all that to yourself, you’re in luck. The person in the store (or on the street corner) may remember your face, but as long as you didn’t reveal any identifying information, there is nothing that links you to the transaction.
Read MoreA decentralized internet was hailed as a way to dethrone Twitter and Facebook. But to the tech giants, the idea could unload some of their burdens.
By Nathaniel Popper Dec. 18, 2019. The New York Times.
SAN FRANCISCO — Not so long ago, the technology behind Bitcoin was seen in Silicon Valley as the best hope for challenging the enormous, centralized power of companies like Twitter and Facebook.
Now, in an unexpected twist, the internet giants think that technology could help them solve their many problems.
The chief executive of Twitter, Jack Dorsey, said last week that he hoped to fund the creation of software for social media that, inspired by the design of Bitcoin, would give Twitter less control over how people use the service and shift power toward users and outside programmers.
Read the full article here
Read MoreThis post is part of CoinDesk's 2019 Year in Review, a collection of 100 op-eds, interviews and takes on the state of blockchain and the world. Gary Gensler is a professor at the MIT Sloan School of Management, Co-Director of MIT’s Fintech@CSAIL and Senior Advisor to the MIT Media Lab Digital Currency Initiative. He was formerly Chairman of the U.S. Commodity Futures Trading Commission, Under Secretary of the Treasury, and a partner at Goldman Sachs.
Read MoreThe year is 2021, and the nation is in crisis. North Korea has just tested a missile that will soon be capable of delivering a nuclear warhead to the continental U.S. The move took Washington by surprise as the project was likely funded via a new Chinese digital currency, which allowed North Korea to bypass the global banking system. In response, the National Security Council House has gathered in the White House Situation Room to formulate short- and long-term responses.
“Digital Currency Wars: A National Security Crisis Simulation” unfolded before a packed audience in Kennedy School Forum on Tuesday night. Hosted by the Economic Diplomacy Initiative and co-sponsored by the Belfer Center for Science and International Affairs, the exercise brought together administration veterans, career diplomats, and academics to dramatize a very real prospect — the rise of an encrypted digital currency that would upend the U.S. dollar’s dominance and effectively render ineffective economic sanctions, like those currently applied to North Korea.
Read MoreMIT’s Digital Currency Initiative (DCI) has announced the launch of Cryptoeconomic Systems (CES), the name of both a forthcoming conference in March 2020 and a new, open-access journal intended to bring a scholastic level of quality in research and reviews to the world of cryptocurrency, outside of the traditional publication channels.
“Cryptoeconomic Systems is a highly collaborative project with worldwide participation from universities, industrial practice and independent researchers — MIT DCI’s involvement can be thought of as providing impetus to initiate these activities for the common good,” Wassim Alsindi, co-organizer of the conference series and managing editor of the journal, told Bitcoin Magazine. “The journal and conference are intended to be mutually intertwined and reinforcing activities.”….
Read MoreBy Olga Kharif
September 30, 2019, 8:00 PM EDT Updated on October 1, 2019, 7:42 AM EDT
What’s the world’s most widely used cryptocurrency? If you think it’s Bitcoin, which accounts for about 70% of all the digital-asset world’s market value, you’re probably wrong.
https://www.bloomberg.com/news/articles/2019-10-01/tether-not-bitcoin-likely-the-world-s-most-used-cryptocurrency
Read More‘zk-SHARKs: Combining Succinct Verification and Public Coin Setup’ by Madars Virza (MIT DCI)
Madars presents at ZKPROOF Workshop on his project zk-SHARKS.
Read More