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Clustering bitcoin accounts using heuristics

In this O'Reilly Data Show Podcast: Sarah Meiklejohn on analytic applications for blockchain and cryptocurrency technology.

Editor’s note: we’ll explore present and future applications of cryptocurrency and blockchain technologies at our upcoming Radar Summit: Bitcoin & the Blockchain on Jan. 27, 2015, in San Francisco.

A few data scientists are starting to play around with cryptocurrency data, and as bitcoin and related technologies start gaining traction, I expect more to wade in. As the space matures, there will be many interesting applications based on analytics over the transaction data produced by these technologies. The blockchain — the distributed ledger that contains all bitcoin transactions — is publicly available, and the underlying data set is of modest size. Data scientists can work with this data once it’s loaded into familiar data structures, but producing insights requires some domain knowledge and expertise.

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I recently spoke with Sarah Meiklejohn, a lecturer at UCL, and an expert on computer security and cryptocurrencies. She was part of an academic research team that studied pseudo-anonymity (“pseudonymity”) in bitcoin. In particular, they used transaction data to compare “potential” anonymity to the “actual” anonymity achieved by users. A bitcoin user can use many different public keys, but careful research led to a few heuristics that allowed them to cluster addresses belonging to the same user:

“In theory, a user can go by many different pseudonyms. If that user is careful and keeps the activity of those different pseudonyms separate, completely distinct from one another, then they can really maintain a level of, maybe not anonymity, but again, cryptographically it’s called pseudo-anonymity. So, if they are a legitimate businessman on the one hand, they can use a certain set of pseudonyms for that activity, and then if they are dealing drugs on Silk Road, they might use a completely different set of pseudonyms for that, and you wouldn’t be able to tell that that’s the same user.

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Regulation and decentralization: Defending the blockchain

Andreas Antonopoulos urges the Canadian Senate to resist the temptation to centralize bitcoin.

Editor’s note: our O’Reilly Radar Summit: Bitcoin & the Blockchain will take place on January 27, 2015, at Fort Mason in San Francisco. Andreas Antonopoulos, Vitalik Buterin, Naval Ravikant, and Bill Janeway are but a few of the confirmed speakers for the event. Learn more about the event and reserve your ticket here.

We recently announced a Radar summit on present and future applications of cryptocurrencies and blockchain technologies. In a webcast presentation one of our program chairs, Kieren James-Lubin, observed that we’re very much in the early days of these technologies. He also noted that the technologies are complex enough that most users will rely on service providers (like wallets) to securely store, transfer, and receive cryptocurrencies.

As some of these service providers reach a certain scale, they will start coming under the scrutiny of regulators. Certain tenets are likely to remain: currencies require continuous liquidity and large financial institutions need access to the lender of last resort.

There are also cultural norms that take time to change. Take the example of notaries, whose services seem amenable to being replaced by blockchain technologies. Such a wholesale change would entail adjusting rules and norms across localities, which means going up against the lobbying efforts of established incumbents.

One way to sway regulators and skeptics is to point out that the decentralized nature of the (bitcoin) blockchain can unlock innovation in financial services and other industries. Mastering Bitcoin author Andreas Antonopoulos did a masterful job highlighting this in his recent testimony before the Canadian Senate:

“Traditional models for financial payment networks and banking rely on centralized control in order to provide security. The architecture of a traditional financial network is built around a central authority, such as a clearinghouse. As a result, security and authority have to be vested in that central actor. The resulting security model looks like a series of concentric circles with very limited access to the center and increasing access as we move farther away from the center. However, even the most outermost circle cannot afford open access.

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Designers are engineers

Dirk Knemeyer on the changing role of design in emerging technology.

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The discipline of design is morphing. Designers’ roles and responsibilities are expanding at a tremendous pace. Jonathan Follett, editor of Designing for Emerging Technologies recently sat down with Dirk Knemeyer, founder of Involution Studios, who contributed to the book. Knemeyer discusses the changing role of design and designers in emerging technology.

Changing roles: Designers as engineers

Knemeyer explains the morphing role of designers as technologies advance and disciplines overlap. Designers are expected to have skills or working knowledge of topics well outside design, including programming and industrial design:

“We’re already seeing a convergence of engineering and design. We’ve been talking about it for a decade, that designers need to know how to code. Designers get it, and they’re out there and they’re learning to code. To remain relevant, to remain a meaningful part of the creationary process in these more complicated contexts, that’s only going to accelerate. Designers are going to need to see themselves as engineers, maybe as much, if not more, than as designers in order to be relevant in participating in the design and creation processes within the world of emerging technologies.”

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Clearing up a few of bitcoin’s misconceptions

Bitcoin is more than just a currency. Here’s a look at what it is and what it isn’t.

Just what is bitcoin, anyway?

Conrad Barski and Chris Wilmer, authors of Bitcoin for the Befuddled, recently hosted a webcast discussing exactly what bitcoin is (and what it isn’t), how it’s used, how businesses can use it, and some of the disruptive opportunities that bitcoin offers entrepreneurs.

How traditional payment systems work vs how bitcoin works

They presented an overview that clears up some of the misconceptions about bitcoin. Read more…

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One more word on drones: Warehouses

Drones might never find meaningful retail delivery work, but they might find practical employment in warehouses.

After writing my short post about the use of drones to deliver packages, it occurred to me that there’s one more realistic use case. Unfortunately (or not), this is a use case that you’ll never see if you’re not an Amazon employee. But I think it’s very realistic. And obviously, I just can’t get drones out of my head.

As I argued, I don’t think you’ll see drones for retail delivery, except perhaps as a high-cost, very conspicuous consumption frill. What could get more conspicuous? Drone pilots are expensive, and I don’t think we’ll see regulations that allow autonomous drones flying in public airspace any time soon. Drones also aren’t terribly fast, and even if you assume that the warehouses are relatively close to the customers, the number of trips a drone can make per hour are limited. There’s also liability, weather conditions, neighbors shooting the drones down, and plenty of other drawbacks.

These problems all disappear if you limit your use of drones to the warehouse itself. Don’t send the drone to the customer: that’s a significant risk for an expensive piece of equipment. Instead, use the drones within the warehouse to deliver items to the packers. Weather isn’t an issue. Regulation isn’t an issue; the FAA doesn’t care what you do inside your building. Autonomous flight isn’t just a realistic option, it’s preferable: one massive computing system can coordinate and optimize the flight paths of all the drones. Amazon probably has some of that system built already for its Kiva robots, and Amazon is rather good at building large computing architectures. Distance isn’t an issue. Warehouses are big, but they’re not that big, and something (or someone) has to bring the product to the packing station, whether it’s a human runner or a Kiva robot. Read more…

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A commitment to biotech, in action

"I eat, breathe, live biotech,” says Ryan Bethencourt. “It’s really all I do at this point.”

Photo shows lab work. Ryan Bethencourt discusses his commitment to biotech.

This story is part of our ongoing exploration of synthetic biology and the DIYbio movement. Learn more by downloading a free edition of BioCoder.


Ryan Bethencourt seized his opportunity back in 2008. That made him an outlier: most people, after all, were seizing pink slips, not opportunities. But while the Great Recession wiped out billions in home equity and blew up companies by the score, it also freed up plenty of hard assets. In simple terms, you could buy a lot of expensive stuff for a song. And that’s just what Bethencourt and his pal, molecular biologist and fellow DIYbio enthusiast, John Schloendorn, did.

“The financial crisis resulted in the liquidation of a big chunk of the biotechnology sector,” says Bethencourt, a molecular geneticist-cum-biotech entrepreneur who was working as a business development director for a clinical research organization at the time. “So we bought up a lot of research-grade equipment. We felt we couldn’t afford to pass it up.” Read more…

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