5122e54437a4b89911623dfbe9a2f3c4

Bitcoin multi-sig transaction part 2

Welcome back bitcoin freaks. In the previous episode, we created a multi-sig transaction. Go back to that blog post if you don't know what multi-sig means.

Our code works. The transaction was made. The problem is that it handle only a theoretical use case when both private keys owners use the same machine to sign the transaction. We need to handle a real life situation when they use different machines. They have to be able to sign the transaction and send signatures to each other.

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D87b50f7d7d0b0314dc4714a247c2022

How to choose a bug tracker for a small startup team

Choosing a project management tool isn’t an easy task. There are tons of SaaS/web-based issue tracking tools out there (like with TODO apps for personal use.) Quora and Stack Exchange threads are full of comments written by marketing teams about these...

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When to move away from Heroku - the cost analysis

The problem

Are you using Heroku or a similar provider and you are not sure how cost-effective it is in the long run?

Are there other limitations of a Platform-as-a-Service of your choice and it would be great to know how expensive and complicated it is to migrate if necessary?

If you are concerned by either of these let me show you if and when it’s worth to start considering a change.

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5122e54437a4b89911623dfbe9a2f3c4

Bitcoin multi-sig transaction part 1

Welcome again. In this episode, we will code a bitcoin multi-sig transaction based on the bitcore library.

A multi-sig transaction means that an output has to be signed by more than one private key. This kind of transactions has a lot of practical use cases. Let’s say we have a company founded by three people. They decided that any outcome has to be confirmed by at least two of them. They create a special bitcoin address where companies bitcoins are stored. The address will require at least two signatures to make any outgoing transaction valid.

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How to make sure you deliver the product

As developers we constantly try to improve our knowledge. We are trying to implement features where the code will be easy to maintain in the future. It is really important when we work on some long lasting, complex project. But should it be a priority when we work for a client with limited budget or tight deadline?

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5122e54437a4b89911623dfbe9a2f3c4

Code your own bitcoin transaction

Today we will code our first bitcoin transaction. To achieve this goal we will use JavaScript library called bitcore. JavaScript is the most popular, modern programming language and almost every developer knows it, so it makes this article universal and useful for the wider audience.

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3254f15ea674eb387b83ebc59253a97d

Your own free PaaS with Dokku and Let's Encrypt

I've been working with Platform as a Service products for almost 3 years. I truly believe that an introduction of PaaS solutions was a breakthrough for web development.

There are many online services that provide an efficient and relatively cheap entry-level PaaS (e.g. Heroku, EngineYard), but what about self-hosted alternatives? Do they exist? Are they a good call?

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01caa77a1f122a1371fed292cab37c72

We were at wroc_love.rb

It’s our annual tradition that we go to the biggest Ruby conference in Poland - wroc_love.rb. This year it took place from 17th to 19th March. It’s a really good thing to attend programming conferences for couple of reasons and here are my thoughts about it.

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InSpec - Inspect Your Infrastructure

We don't have many infrastructure related posts here. We have a few full-time DevOps, it's a part of our normal offer. But, we're busy most of the time. When an opportunity to write a blog post emerged, I knew I've had to write about a thing which changed our workflow. During last two years, there were few ideas which helped us providing better and more reliable services - one of them is infrastructure integration testing.

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"By order of the Peaky fuckin' Blinders" - how to do dirty work and don’t get caught - episode 2

"Intelligence is a very valuable thing, innit, my friend? And usually it comes far too fucking late."

Alfie Solomons

This time is different. Intelligence comes in the right time. In the previous episode, we learned how is “our” API working. It is time to code the scraper that will use this API to get the data we want. Unfortunately, the API provider probably doesn't want us to get this data. He will ban us as soon as he will notice our unwelcome activities. Good news is that we will be smart from the beginning and prevent being noticed and banned :)

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