(Updated for Fabric 2.3.2 and Ubuntu 20.04, easily work with v2.2.3 LTS and v1.4.12 LTS too, still less than 3 mins to read, 5 mins to install! But try not to use the $5 1GB RAM instance with 2.3.x, you might run out of memory when starting the sample network, use the $10 2GB RAM one.)

Yes, It can be done, in 5 mins or so. So I won’t waste too much time to explain these to you. Just get a basic Ubuntu 20.04 Droplet from DigitalOcean, or use my link (Discount code for newbies, I get some free referral…


Sharing notes from our second dev intern study topic, cloud infrastructure. It’s a very big topic to cover in a couple of weeks and the notes might seem a bit unstructured. We are still editing it and adding some diagrams, links, etc. Use it as a collection of key concepts in the cloud computing topic. (Probably best for beginners who haven’t even installed Windows Server or Linux).

Our interns, William and Eleanor, both CompSci undergrads, spent a week researching into the topic with some starting questions, we met to discuss the topic for an hour or so, and then a…


Image from Wikimedia Commons

Sharing our notes from a Blockchain study session for our new interns, William and Eleanor, both CompSci undergrads. They spent a week researching into the topic with some starting questions, we met to discuss the topic for an hour or so, and then a week or so to write up the topic. We will update and edit these notes every now and then, and we welcome feedback and comments. Thanks.

We will soon be updating this article to include a bit more about Crypto and DLT. Stay tuned.

OnDemandWorld team, we are working on a new blockchain and AI based…


Photo: CC2 Licence, Click here for original.

(Updated 20210804) Further to my Get into Crypto Trading Now article, which was written for newbies to get into trading and start playing around with crypto, I am writing this note to share my wider opinion on the “recent” late-2020 crypto craze. Take a look at the chart below, still can’t see the pattern?


(Updated 20210413) Cryptocurrency is still the main killer app for blockchain tech, many projects been trying hard to build new business case with it, but still ended up just dancing around with tokenomics. Stop wondering if bitcoin is just a fad, try it out. It’s easier than getting a bank account! Can start with just a few bucks or even for free. Why not? Dive right in, you might end up understanding how powerful blockchain can be and appreciate how it created a decentralised market place worth billions quicker than Facebook and Google did.

Just using this article to share…


Let’s try to change the data economy together. Force Google and Facebook to price your time spent with their “free” services and reward you! I wish one day Brave Browser will be strong enough to start asking Google to reward you with tokens for each search. Just click here to get it from Brave.com or get it from your favourite mobile app stores.

This article doesn’t generate any referral or other rewards from Brave.

There are many Chromium based browsers, their web viewing performance are all at similar level as they share the same rendering engine. Microsoft Edge is another…


(Updated on 20210619) Just keeping a list of apps my dev team use on Mac.

  • Brave Browser — Just like Chrome, but no ads and you get rewarded if you choose to view ads. Read about why I recommend Brave here.
  • Microsoft Edge — You probably won’t believe me, but I think Edge is a good browsers too.
  • KeePassXC — To store my passwords which are not in the built-in keychain. No, I don’t trust SaaS to store my passwords.
  • qBittorrent — Bittorrent client, supports RSS which I use with showRSS to watch daily shows regularly.
  • Resilio Sync — I…


(20210124 This article is (over)due for an update to Fabric 2.3/2.2.x, until then, you can still play around with 1.4.4 as below.)

This is a guide to set up a Fabric Network of 1 orderer with Kafka, 1 Organisation with 3 peers, deployed across 3 nodes using extra_hosts configuration. This network is tested on Digital Ocean droplets with Ubuntu 18.04 with Hyperledger Fabric 1.4.4. Bare minimum of 2GB RAM for around 60% CPU (high) utilisation.

For Chinese verison of this article, clicke here. 点击这里即可查看本文的中文版。

Depending on the speed of the network connection, you can just about run all the steps…


This is a guide to set up a Fabric Network of 1 orderer with Kafka, 1 Organisation with 3 peers, deployed across 3 nodes using extra_hosts configuration. This network is tested on Digital Ocean droplets with Ubuntu 18.04 with Hyperledger Fabric 1.4.4. Bare minimum of 2GB RAM for around 60% CPU (high) utilisation.

点击这里即可查看本文的中文版。

Depending on the speed of the network connection, you can just about run all the steps below perfectly and install it in around 30 mins. Let’s start. (I recommend getting at least the $15 bucks a month Droplet from DigitalOcean, you will need the 3GB RAM…


It’s no accident. A study conducted by the National Institutes of Health (NIH) and the Department of Agriculture (USDA) found that over the past 25 years, “average daily rates of obesity and overweight increased among adults between the ages of 18 and 64.”

The study found that “people of normal weight were three times more likely to be obese and five times more likely to be overweight than those who were overweight.” …

Edward Tsang

Experienced technologist, focused on selective combinations of blockchain and AI. I am not a writer, I use Medium like an online notepad to share my thoughts.

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