Rust #4.2 - Defining Concrete Types for Blocks and Transactions

In this lesson, we take the next step in building our Rust blockchain by defining the concrete types for blocks, headers, and extrinsics. We'll establish the necessary types using the support structures we previously imported. You'll learn how to define the extrinsic, header, and block types using generics like AccountID and RuntimeCall. This foundational setup will enable us to start creating and managing blocks in subsequent lessons. By the end of this lesson, you'll have a clear understanding of how to structure the core components of a Rust-based blockchain, preparing you for the implementation of specific system and runtime calls.

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