Jeremy Rubin's Blog

Drawing the Blockchain

One of my major pet peeves in presentations about the blockchain is that most people seem to draw the arrows/pointers in the incorrect direction.

Pointers should point from newer blocks to older blocks. This is because in a blockchain, each block is immutable so it would be impossible to update older blocks to point to newer ones. This is also in line with most singly linked list representations. Because it can be confusing, it’s always best to include reference heights for extra clarity.

Kansai Trip

I took a few day reprieve from Tokyo to visit the Kansai prefecture.

While there, I visited Osaka and Nara. I was feeling a little bit unwell so I skipped Kyoto/Kobe, but will be looking forward to visiting when I’m next in Japan!

Getting to Kansai

I decided to take an early morning Shinkansen (i.e. a bullet train) from Tokyo to Osaka on Tuesday morning. Because my hotel stay was officially over, I stayed the night in a “Manga Kissaten”. For the uninitiated, a Manga Kissa is basically a somewhat skeevy 24/7 pay-per-hour library with free drinks and private booths. I had heard that they were a reasonable place to stay – I think I had a particularly bad one, the air was smoke filled, the drinks were just OK, there was no shower in the morning, and they didn’t dim the lights past midnight (these are all problems I’ve heard higher-end Manga Kissaten do not suffer). Blearly eyed, I made my way to the train station and purchased a ticket, and boarded the first train to Osaka.

Osaka

Upon arriving in Osaka I made my way down to a place called Spa World in an area called Dotonbori-Mae. Unfortunately, they were overbooked/expensive so I looked elsewhere nearby. After comparing the offerings across the street, I found a really nice backpacker’s hostel where I was able to secure a private room (Japanese style) for about $13 USD a night.

From the hostel I decided to just walk the length of the city, starting from the hostel all the way to Umeda. As a straight shot, this is about 4 miles, but I wandered around so it was longer.

For lunch I ate okonomiyaki (a Japanese “pizza” that’s a little closer to a omelette). It is served on a hot griddle, yum!

Later that night I went to the Don Quixote. DQ is like a wacky Walmart/Spencer’s Gifts hybrid. It has everything from groceries to a sex shop. A few floors up there was an (unrelated?) arcade/casino. I bought some chips and started playing games. After playing for about an hour (and not doing very well), I went to cash out my remaining tokens. I found out that tokens are not actually exchangeable for anything. I asked some other players if they could help me exchange, and they agreed because they thought you could cash out too. When they found out they couldn’t, they seemed to be a little off put, but I gave them my tokens so they were happy. What was weird is they even had a bank for the tokens…

Nara

I really enjoyed my visit to Nara. The deer are so kawaii!

In Nara you can find the Tōdai-ji, or a temple featuring a huge bronze Buddha (the largest bronze statue in the world and the largest Buddha in Japan). The Tōdai-ji temple is also one of the largest wooden buildings in the world.

Visiting Japan

I’m visiting Japan for two weeks to help teach BC-2 at Digital Garage.

I’m very excited to have the chance to explore Tokyo and hope to make many new friends while out here!

Hopefully I can fill in a few details about my trip as I go…

tail -f /var/log/life

I’m hoping to start blogging more frequently – consider this the first post. I’m going to fill in some back-dated posts though.

Graduating MIT

finally...

Well, I did it: I graduated MIT with my S.B. and M.Eng in 4 years! And apparently I was the most joyously nerdy.