== Chapter 1 - What is Bitcoin?
* Updated Bitcoin history
* More user stories and updates
* More examples of bitcoin uses and clients
* Updated guide on how to get, use, spend bitcoin

== Chapter 2 - How Bitcoin Works
* Many small changes, updates and improvements

== Chapter 3 - Bitcoin Core
* Improved and updated examples and code
* Configuration options and examples
* Running a bitcoin node
* Updated libraries

== Chapter 4 - Keys and Addresses

* Many small improvements
* Improved and new diagrams

== Chapter 5 - Wallets

* Much more detail on BIP39 Mnemonic Code Words
* BIP39 Passphrases and use-cases
* Using public extended keys on an e-commerce server
* Improved and new diagrams

== Chapter 6 - Transactions

* Transaction Structure
  * More detail on inputs and outputs
  * Transaction serialization/deserialization

* Transaction Fees
  * Dynamic fees
  * Fee estimation
  * Third-party fee estimation services

* Digital Signatures
  * Signature creation and verification
  * Signature serialization (DER encoding)
  * SIGHASH flags
  * ECDSA Math overview
