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Mining Bitcoin with pencil and paper: 0.67 hashes per day
This article is now available in Japanese: 紙と鉛筆でビットコインをマイニング：1日に0.67ハッシュ and Russian: Майним Bitcoin с помощью бумаги и ручки . I decided...
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Fraudulent trading activity at Mt. Gox
Somewhere in December 2013, a number of traders including myself began noticing suspicious bot behavior on Mt. Gox. Basically, a random number between 10 and 20 bitcoin would be bought every 5-10 m…
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Minimum Viable Block Chain
Block chain is agnostic of any 'currency' and it can (and will) be adapted to power many other use cases. This is a ground up explanation of why the particular pieces (digital signatures, proof-of-work, transaction blocks) are needed, and how they all come together to form the minimum viable block chain with all of…
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Reading the Silk Road configuration
Many of us believe it wasn't the FBI who discovered the hidden Silk Road server, but the NSA (or other intelligence organization). We believ...
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Dogecoin and the Appeal of Small Numbers
Dogecoin is a unique phenomenon in the fascinating world of cryptocurrencies. It’s barely six weeks old, and as I write this post its network has more computing power than any other cryptocurrency except for Bitcoin. It made headlines this weekend when its community raised enough money to send the Jamaican bobsled…
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Tarsnap now accepts Bitcoin
There is a significant commonality between Tarsnap and Bitcoin — both rely crucially on strong cryptography, and anecdotally it seems that many Bitcoin users rely on Tarsnap to back up their "wallets" (I have no concrete data since I can't tell what data people are backing up ) — so it's not surprising that many…
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Bitcoins the hard way: Using the raw Bitcoin protocol
All the recent media attention on Bitcoin inspired me to learn how Bitcoin really works, right down to the bytes flowing through the netwo...
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Satoshi's Hashrate
"Bitcoin mining pool, network and exchange analysis"
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How to steal Bitcoins that are protected by weak passphrases
Every Bitcoin address is based on a secret key, from which the public key (associated to a Bitcoin address) is calculated. Once you have the private key for an address, you have the control of that address and can use it to transfer funds.
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The programming error that cost Mt. Gox 2609 Bitcoins
In October 2011, Mt Gox lost over 2609 bitcoins by accidentally creating transactions that can never be redeemed. (At the time, 2609 bitcoin...
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This is What it's Like to Be a Woman at a Bitcoin Meetup
"You want Tikhon and Arianna on your team. They are A++ hustlers that will walk through walls and put in hundreds hours of work on your toughest problem. There are 43 investors in Simple Contacts, Tikhon and Arianna are my first calls."
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How you will not uncover Satoshi
Computer forensics is the science of finding evidence in computers and digital documents, and when a hacker perform forensics, better be prepared for the unknown. Satoshi did many things in order t…
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Minting Money with Monero and CPU Vector Intrinsics
A blog about computer science, systems, technology, and sometimes vegan cooking.
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What Is a Bitcoin, Really?
When I first started learning about Bitcoin, I found plenty of information, but nothing that directly answered the most burning question: When you buy bitcoins… what is it …
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Bitcoin mining the hard way: the algorithms, protocols, and bytes
This article explains Bitcoin mining in details, right down to the hex data and network traffic. If you've ever wondered what really happe...
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Bitcoin transaction malleability: looking at the bytes
"Malleability" of Bitcoin transactions has recently become a major issue. This article looks at how transactions are modified, at the byte...
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Cryptocontracts Will Turn Contract Law Into a Programming Language
A couple of weeks ago, I wrote a post with 10 things that amazed me about bitcoin (here). I just can’t stop thinking about the idea that I brought up in the final point of that post, specific…
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Bitcoin contracts
Bitcoin is designed to support a wide variety of transaction types. Although currently the majority of transactions are standard payments to address it is possible to build more complex protocols.
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Account hijacking on MtGox
If it wasn't MtGox I wouldn't even mention it — XSS/fixation/etc are web sec routines, and are not worth a blog post. But it *is* MtGox. W...
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