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Downloading 122MB of the bitcoin blockchain

June 1, 2017
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Apparently it will take just over 1 year for me to download the entire bitcoin blockchain! I certainly hope not. Let’s wait and see.
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STEM, Blockchains and Collaboration

May 29, 2017
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The Hutt Valley STEM Festival was part of NZ tech week and I was asked to participate to talk on Technology and the New World of Work. There were 4 speakers in total. Gary talking about the importance of collaboration and communications. I talked about the importance of learning STEM, blockchains and how collaboration helped me with my “Ubering Energy on the Blockchain” project. Malcom talked about a sprout device which is this amazing device that allows not only 3d modelling, but changes the way we interact with computers. Gordan, the local 3d printing expert talked about how 3d printers work with tips for those going down the 3d printing path. The kids loved watching the 3d printer in action. Gordon in action speaking about 3d printing. Sean’s household electricity distribution board connected to a raspberry pi and a mac. It measures electricity consumption and displays it on a webpage. STEM, Blockchains and Collaboration presentation at the Dowse Art Museum.  
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Blockchain in Health Presentation

May 26, 2017
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I had the opportunity to present at the Emerging Tech in Health Symposium 2017 on the 24th of May at the Wellington Westpac Trust Stadium to an audience of 180 health and medical professionals along with IT mangers of health firms. It was organised by Health Informatics New Zealand (HiNZ) and New Zealand Health IT (NZHIT). Here is a list of all the Emerging Tech In Health Speakers. The focus was on looking forward to see what healthcare would look like 10 years down the track. Some of the concepts were mind blowing. Health care is going to radically change with technologies such as virtual/augmented reality, monitoring patients with devices that measure and record your every movement and with Nadia, a virtual avatar. Basically everything thing you’ve seen in sci-fi movies, will practically come true. I spoke briefly about what the blockchain is, some of the properties it has and attempted to help the audience understand blockchain related health articles a bit more. Some other highlights included a future with these control centers in hospitals that make it look like the floor of the New York Stock Exchange or mission control in Houston. 3D printing medication! And project Emma which […]
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NZ Blockchain Conference 2017 Summary

May 18, 2017
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This years blockchain conference was brilliant and engaging and will be remembered (at least for me) for the 2 keynote speakers, Andreas Antonopoulos and Vitalik Buterin who came to New Zealand and imparted their knowledge and engaged with the people of New Zealand. It started on Sunday the 7th of May where an Auckland harbor cruise was organized and some of the speakers made it. Afterwards, we all headed down to Monsoon Poon for drinks, dinner and more socializing. The conference started on Monday and all the speakers were great but a few speakers stood out for me. Pamela Morgan’s talk on bitcoin was full of energy talking about the legal aspects of bitcoin and also the need to be able to secure it properly with multi-party signatures. She is a lawyer with an inner geek streak that uses Ubuntu as her OS of choice. Now that is impressive! The other highlight was of course Andreas Antonopoulos. His talk was as always of high quality, thought provoking and to the point. He has this incredible knack for creating these superb analogies to explain various concepts. One of the best parts was in the panel discussion where he addressed a comment […]
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Day 2 recap of Blockchain NZ Conference #TBCNZ17

May 9, 2017
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Day 2 of the conference started with Christoph Jentzsch from Slock.it talking about “How companies can exist with only computer code and the story of ‘The DAO’.” It was amazing to be able to meet the person who “authored” the DAO. Margaux Avedisian was next talking about a “Beginners Guide to raising money via ICO’s (Initial Coin Offerings)” and “How to plan and execute a successful crowdsale”. It was very insightful and very interesting. The main takeaway I got was that you have to know your stuff if you’re asking for money. If you don’t, you will be found out. Jake Vartanian then talked about “Crowdsale Design, Marketing, and Community.” He had the most powerful and emotional start to his presentation when he talked about his experience meeting a kid who wanted $125 to start up an ice cream stand on his travels in South East Asia. He ended up giving the kid the money and kept in touch ever since. There was a panel discussion after that taking questions from the audience. After morning tea Graham Anderson & Mital Kayaiya from Webjet Australia shared their experience with what they are doing with blockchains. Maksim Izmaylov from Travel Tech Con […]
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Day 1 recap of Blockchain NZ Conference #TBCNZ17

May 8, 2017
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The day started off with a welcome from Minister Jacqui Dean. Then Vic Crone from Callaghan Innovation talked briefly about their involvement. Mark Pascall from 3 Months then gave a great talk on “How to explain explain blockchain at a dinner party, without boring the pants of everyone”. It was interesting and humorous as well with notes such as don’t bring a laptop and a projector to a dinner party! Paul Salisbury from 3 Months then gave a blockchain 102 and laid the foundation of how blockchain works and some of the details under the hood which was important. He has a very clear and calm voice which drew the audience in and kept their attention. Then came Pamela Morgan from Third Key Solutions talking about bitcoins, blockchains and smart contracts from lawyers. If Mark brought the humour and Paul bought the voice, Pamela bought the energy! She is a geeky lawyer and was certainly passionate in her message. After morning tea, Stephen Macaskill, president of the blockchain association of New Zealand talked about why bitcoin matters and the history of money. Stephen also has a calming voice and thinks the word crypto will become synonymous to great or amazing. […]
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The Blockchain NZ Conference kicks off at the Westhaven Pier in a few hours

May 6, 2017
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It’s Sunday and the most anticipated blockchain event in New Zealand will start tomorrow but festive activities are actually starting today with a harbour cruise. There is a special pre-blockchain harbour cruise at 12:30pm today from Westhaven Z pier. Check here for more info. After this, at 6pm there is a pre-conference function at the Viaduct/Moonsoon Poon. Andreas Antonopoulos will be the keynote speaker on Monday and Vitalik Buterin providing the closing keynote on Tuesday. Check out the blockchain NZ conference site for details on speakers and the agenda. It’s gonna be huge. See you all there.
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A Webpage for Selling Energy to your Neighbour

May 4, 2017
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It may seem like not a big deal but it’s the little things that count. I decided to build a simple webpage that displayed the same figures that could be seen on the command line but there was just something about the familiarity with seeing a webpage versus seeing a terminal screen.   As you can see the values are the same but it added a bit more work. It was worthwhile though. The trick with getting a webpage to talk to the blockchain and display the information is to use javascript to create a connection to testrpc on port 8545 in this case and to contract address and update this each time you deploy the contract. The source code is available at https://github.com/seandotau/mpower where it should be self explanatory if you have some basic javascript skills.
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US debt in pictures

May 2, 2017
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Some very big numbers: http://demonocracy.info/infographics/usa/us_debt/us_debt.html This is why we need bitcoins! With money you just keep printing more of it!
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BANZ AGM, Ubering Energy and what sharing does

April 28, 2017
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I was invited to Auckland to share my “Ubering Energy on the Blockchain” talk at the GridAkl (“Auckland’s Innovation Precinct”) a few days ago and it neatly tied into the first Blockchain Association of New Zealand (BANZ) AGM. It was wonderful to meet all these people from different backgrounds all contributing to this new technology. The vibe is certainly different to that of Wellington. It was fascinating to learn more about what NZTech does, the blockchain research projects from AUT and some exciting energy projects that others are doing as well. The next few months is certainly going to be very interesting. BANZ is gaining momentum and there are plans in place to grow the awareness and to continue the concerted efforts to see where this technology can go in all sorts of industries. The Blockchain Conference at the start of May is going to be huge with some amazing speakers. The big challenge I see is to continue this momentum. It’s been 8 years since bitcoin was invented. The 10 minute heartbeat that started this avalanche of innovation and paradigm shift has never stopped beating. Yet the resistance is still there and for all sorts of reasons. I’ve been […]
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Guerilla Open Access Manifesto

April 26, 2017
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Worth a read and research https://ia800808.us.archive.org/17/items/GuerillaOpenAccessManifesto/Goamjuly2008.pdf Also here if the above link breaks: Goamjuly2008
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Blockchain vs. Bullshit: Thoughts on the Future of Money

April 24, 2017
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Another great talk by Andreas Antonopoulos. Some key points. There is a lot of BS going around. BAU disguised as innovation Blockchain is bitcoin with a haircut and a suit that you parade in front of your board Define blockchain in such a way that you can’t replace it with database and still make the sentence work Open, borderless, transnational, no 3rd parties, neutral, decentralised Consortium = Cartel This isn’t about banking the unbanked. It’s about debanking all of us  
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An Ethereum Hello World Smart Contract for Beginners part 2

April 22, 2017
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If you followed part 1 of creating smart contracts on Ethereum and you got the contract running successfully then congratulations. Here in part 2, I’ll go through how you can get the same smart contract working on a real blockchain. The Ethereum testnet blockchain instead of testrpc which is like an in memory private blockchain simulator. Step 1: Download geth The first step is to download geth (basically Ethereum that is written in Go). This is the Ethereum client that is going to run the Ethereum blockchain. Here are the instructions for OSX > brew tap ethereum/ethereum > brew install ethereum (From: https://github.com/ethereum/go-ethereum/wiki/Installation-Instructions-for-Mac) Then run it with: > geth --testnet and leave this terminal open. If you forget the testnet flag, you’ll end up downloading the real chain. ie THE Ethereum blockchain. Step 2: Download Mist (optional) I found downloading Mist convoluted but it gave me a chance to really learn how things worked. Mist is a graphical application that contains geth and an Ethereum wallet. This was confusing at first because you can also download an Ethereum wallet by itself. The advantage of Mist is that you can see the accounts, create new accounts and practice transferring ether all […]
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Wellington Blockchain Meetup April 2017

April 20, 2017
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We were in the cozy corner at BizDojo, the S-Zone they call it and everyone got comfy, squeezing in to hear the latest updates and developments in the blockchain world. NZ Blockchain Conference update Mark Pascall, organizer of the NZ Blockchain conference on the 8-10 May, gave an update of how the event was tracking.  There’s still time to grab tickets and join the action with world class speakers heading our way. For more info check out http://www.theblockchain.nz Work is underway to get some of the speakers down to Wellington so watch this space for more info. Introduction to the Blockchain Association of New Zealand Paul Salisbury, secretary of the Blockchain Association of New Zealand (BANZ) then talked about BANZ and their role in developing the community and what it offers to it’s members. To keep up to date be sure to sign up to the newsletters over at https://blockchain.org.nz and check out the membership offerings at https://blockchain.org.nz/membership/ Ubering Energy on the Blockchain Sean then gave his presentation on Ubering Energy on the Blockchain where he shared his journey on how he built an electricity meter to get the data, stored the data on IPFS, allowed the users to visualise it […]
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An Ethereum Hello World Smart Contract for Beginners part 1

April 17, 2017
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Venturing into the world of building smart contracts on Ethereum can very daunting at first. Where do you start? https://www.ethereum.org/greeter is not a great place to start because it doesn’t give any context or start with the basics. Once you’ve built your first smart contract, the greeter makes a lot more sense. https://medium.com/@ConsenSys/a-101-noob-intro-to-programming-smart-contracts-on-ethereum-695d15c1dab4 is pretty good. What I wanted was more simple and basic though. I continued searching and plucked bits and pieces from all over the place and this is what I’ve come up with. A super simple smart contract on Ethereum In this article, I’m going to demonstrate how to build a very simple smart contract. This smart contract allows the user to deposit tokens and allows the user to query for the balance. Two simple functions. Step 1: The code The comments should explain what the code does. // A simple bank smart contract where the user // can deposit and query funds. // by @seandotau 16 April 2017 // This needs to be the first line. pragma solidity ^0.4.0; // give your contract a name contract aBank {          // this declares a key/value array called balanceAccount.     // the key is address and […]
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Ubering Electricity on the Blockchain

April 14, 2017
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I came up with this idea 18 months ago and like any one thought it was super amazing and super unique. A worlds first maybe? A Google search quickly crushed that idea! People had already talked about it and others were also building it and testing it. That didn’t deter me though because hey, when is an idea ever super unique. It’s all about execution! I started designing it over Christmas and spent the last 2 months building it. I’ll be presenting it at the Wellington Blockchain Meetup next Wednesday. What is it? Check out the video below. Come along if you’re around to understand what I did and how it works.  
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HVHS Technology Scholarship Contribution

April 11, 2017
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I was invited to Hutt Valley High School this morning to meet with some students from the Technology Scholarship programme to share my industry experience on a project the students are working on. The goal for the students are to take an idea from inception to a proof of concept or prototype and document their journey. It is very detailed where lots of research is required, feasibility studies, requirements gathering, client relationship management, design, developing, testing the whole lot. It is amazing what the students nowadays have to do. Speaking with me it must have felt like stepping into a time machine because I talked about when I attended HVHS, mobile phones were the size of bricks and Google, Facebook and Twitter had yet to be invented. That was because it was the early 90’s and it was the Internet that was being invented. I was there to provide feedback on their ideas, share some industry experience and talk about some of the latest trends in technology. One key points I talked about was that one doesn’t need to have the best idea or the most unique or ground breaking idea because it’s about execution. Bringing the idea to life […]
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geth attach on testnet error

April 9, 2017
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If you are trying to run the command geth attach and you get this error > Fatal: Unable to attach to remote geth: dial unix /Users/<username>/Library/Ethereum/geth.ipc: connect: no such file or directory it is because geth cannot find the file geth.ipc. This typically happens when you have run geth –testnet. This file gets generated at run time. To fix this, run geth attach with the additional ipc command. ie > geth attach ipc:/Users/<username>/Library/Ethereum/testnet/geth.ipc and that should do the trick! Installing Solidity on OSX If you are trying to install Solidity on OSX these are the commands you need to run. brew update brew upgrade brew tap ethereum/ethereum brew install solidity brew linkapps solidity If you get this error: ==> Installing solidity from ethereum/ethereum Error: You must `brew link cmake` before ethereum/ethereum/solidity can be installed it means you need to run “brew link cmake” as instructed. If you run brew doctor you will find a similar reason. Warning: You have unlinked kegs in your Cellar Leaving kegs unlinked can lead to build-trouble and cause brews that depend on those kegs to fail to run properly once built. Run `brew link` on these:   cmake The tricky part is that when you […]
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Protected: Understanding how permissioned blockchains can work for you?

April 9, 2017
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There is no excerpt because this is a protected post.
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Wellington Blockchain Meetup April 2017 Announced

April 7, 2017
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The next Wellington Blockchain meet up will be on 9th November at 5:30pm at Bizdojo. We’ve got an interesting agenda where Mark will provide an update on the NZ Blockchain conference, Paul will talk about the Blockchain Association of New Zealand and the programmes being run and Sean will share developments of his latest project, how to sell excess electricity to your neighbor, the Uber of electricity. Look forward to seeing you all there. April Blockchain Wellington Meetup Wednesday, Apr 19, 2017, 5:30 PM Bizdojo115 Tory Street Wellington, NZ 51 Members Went Hey guys,Let’s get together to chat about bitcoins, blockchains and smart contracts. It doesn’t matter what your background is. If you are interested and what to learn more, have questions that you want answered or want to meet with others in this industry then come along. All welcome.In this meet up we’ve got a few small presentations.5:30 pm: … Check out this Meetup →  
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