Guru on Rails

if you don’t sacrifice for your dream then your dream becomes your sacrifice.
Will Nguyen


Tue 02 Oct 2018


Technically, it's like a tracking device. At first when I investigate any technology I look for the reason. Why does it appear? What problems does it solve? It would be useful, wouldn't it? The ans...

Fri 19 Oct 2018

Security Blockchain

We use digital signature a lot nowaday. In order to understand the blockchain technology - it's more likely the design pattern, we have to understand the digital signature. How does it work? Which ...

Tue 23 Oct 2018


Transactions move value from transaction inputs to transaction outputs. An input is a reference to a previous transaction's output, showing where the value is coming from. An output is a specific ...