The Blocks and the Chain
Understand what a blockchain ledger is and how blocks are joined together to form a chain.
We'll cover the following...
In this lesson, we’ll learn the logical components of a blockchain and how they work together in a complex but fascinating and precise way.
A blockchain deals with two types of data:
Permanent data (that can never be changed).
Ephemeral data (that can be changed).
This is the principal distinction between the two parts that consitute a blockchain ledger:
The world state (ephemeral).
The blockchain (permanent).
Let’s look at these two components in detail to understand how they are so closely related.
The world state
A status is a mapping between a label and some data. We refer to the label as the key and the associated data as the value. In a distributed ledger, a key identifies an account and the value is a set of information tied to that account. ...