# Category Archives: Computers

## Calculating Fibonacci Numbers, Quickly and Exactly

The well-known Fibonacci series $$F_n$$ can be defined as follows: $$F_n = \begin{cases} 0 & n = 0 \\ 1 & n = 1 \\ F_{n-2} + F_{n-1} & n \ge 2\\ \end{cases}$$ Let’s use a few facts about matrices … Continue reading

Posted in Computers | 3 Comments

## Messing with Bitcoin Keys and Addresses

The “bu” tool is obsolete, which makes this post not-so-useful. Look at this file instead. The command line utility “bu” (for “Bitcoin utilities”) is included with my Python-based pycoin library. This utility makes it easy to deal with Bitcoin private … Continue reading

Posted in Computers | 15 Comments

## Command-line Bitcoin Transactions

The “spend” tool is obsolete, which makes this post not-so-useful. Look at the “tx” tool mentioned in this post instead. Creating a signed transaction is the holy grail of Bitcoin. Without this functionality, a Bitcoin client can’t really be called … Continue reading

Posted in Computers | 10 Comments

## On BIP0032 and Bitcoin Deterministic Wallets

BIP0032 defines a way to create a hierarchical deterministic wallet (that is, a way to create an entire tree of Bitcoin addresses and private keys) through a tree of wallet key nodes. Each node has a public and private key … Continue reading

Posted in Computers | 6 Comments

## How to be Minimally Redundant (or “A Splitting Headache”)

I’ve recently been investigating the command-line utility zfec, which is a lot like the UNIX “split” utility, except, using a technique called erasure coding, you can choose to split your file into M pieces, any K of which are enough … Continue reading

Posted in Computers | 8 Comments

## Good-bye App Engine

I’d been running my web site for comedians LaffQ.com in Google App Engine for nearly two years. Google App Engine seemed pretty neat when it first came out: it was the only free hosting service I knew of where you … Continue reading

Posted in Comedy, Computers | 4 Comments

## Some Whining About Video Software

I’ve been working on editing video again lately. I’m struck by the same feelings I had last time I tried to do this way-too-complex and thankless task. I appeared on the local cable access show “Paint with Lynn”, with my … Continue reading

Posted in Computers | 4 Comments

## Django on Dreamhost

I went to the San Francisco Django Meetup last week and met some smart, nice people. There was some talk about host to deploying Django. There were many good things said about Slicehost. Of course, to my mind, the cheapest … Continue reading

Posted in Computers | 1 Comment

## On the Air (2)

Here’s the radio show I did on Sunday. It’s an hour long. It starts with a three minute audio clip of a funny guy who isn’t me, so don’t be confused by that part. "What's So Funny" radio show, Dec. … Continue reading

Posted in Comedy, Computers, Life | 2 Comments

## Free Stuff! Come ‘n Git It! (Part 2)

I’ve created a couple more git depots with some rather old code that has been written and open sourced for quite some time… but just never shared. One is a simple C-based command-line utility to quickly fix line endings for … Continue reading

Posted in Computers | 1 Comment