Kalle Rosenbaum

Kalle Rosenbaum has worked as a software developer for 20 years. His passion for Bitcoin began in 2013 and has continued uninterrupted. Kalle started a Bitcoin consultancy company in 2015 and has worked in the Bitcoin industry since then. He also writes a technical blog that explains various technical Bitcoin topics, such as block-propagation improvements, sidechains, and replace-by-fee. The purpose of the blog is to teach himself and let others benefit, too.

books by Kalle Rosenbaum

Exploring Bitcoin

  • April 2019
  • ISBN 9781617297014
  • 86 pages

Bitcoin is hailed by its supporters as a secure independent money system, offering the potential to end centralized banking along with economic issues like inflation and financial exclusion. The key to bitcoin’s security—and the reason its supporters trust it so much—is its reliance on an incorruptible digital ledger, known as the blockchain.

In Exploring Bitcoin, author and Bitcoin expert Kalle Rosenbaum presents two chapters from his own book, Grokking Bitcoin. In the first fully-illustrated chapter, you’ll start with a simple traditional money system and improve on it using Bitcoin technology. You’ll learn about cryptographic hash functions and digital signatures. Digital signatures are then used to guard against imposters by authenticating payments.

In the second chapter, you’ll take a close look at Bitcoin's blockchain which enables anyone to fully verify the complete transaction history. The blockchain also enables lightweight Bitcoin wallets to save bandwidth and storage space. Exercises in each chapter reinforce all that you’ve learned along the way. By the end of this free ebook, you’ll understand how some parts of the Bitcoin system works.

Grokking Bitcoin

  • April 2019
  • ISBN 9781617294648
  • 480 pages
  • printed in black & white
  • Available translations: Finnish, German, Japanese, Polish, Russian

Grokking Bitcoin explains why Bitcoin’s supporters trust it so deeply, and why you can too. This approachable book will introduce you to Bitcoin’s groundbreaking technology, which is the key to this world-changing system. This illustrated, easy-to-read guide prepares you for a new way of thinking with easy-to-follow diagrams and exercises. You’ll discover how Bitcoin mining works, how to accept Bitcoin, how to participate in the Bitcoin network, and how to set up a digital wallet.