🦀 Rust Master Class - Chapter 24: Blockchain Trust fall exercise.
You fall backward.
Someone catches you.
But what if they don't?
Blockchain is trust — but the cryptographic kind.
Mathematical kind.
Building a blockchain from scratch in Rust involves using custom data structures to represent blocks and the chain itself, combined with cryptographic hashing for security and a "mining" process to validate new entries .
1.
Core Data Structures The foundation of a blockchain consists of two primary structs: , which holds the actual data, and , which stores the sequence of blocks in a vector .
Fields: Typically include a unique , a (used for mining), the payload, the current block's , the to link it to the chain, and a .
Fields: Primarily contains a field, which is a [3-5].
Code Example: [Source: 37, 163]
2.
The Genesis Block Every blockchain must start with a genesis block (the first block).
It is initialized with a specific ID (usually 1) and a dummy (often a string of 64 zeros) . [Source: 37]
3.
Mining and Hashing Mining is the process of finding a valid hash for a new block.
In these sources, a valid hash is defined as one that starts with "0000" .
Proof of Work: A is used to repeatedly hash the block's content while incrementing the until the resulting hash meets the "0000" prefix requirement .
External Crates: The implementation relies on for hashing and for timestamps .
Code Example: [Source: 43]
4.
Validation Logic To maintain the integrity of the chain, Rust methods are used to verify both individual blocks and the entire chain . : Checks several conditions: The must match the of the preceding block .
The current block's must start with "0000" .
The must be exactly one greater than the previous block's ID .
Re-hashing the data must yield the same stored in the block . : Iterates through the entire vector and calls the validation logic on each pair of blocks to ensure no historical data has been tampered with .
5.
Chain Selection In decentralized scenarios where multiple versions of the chain exist, a method is used to determine the correct copy .
It typically validates both local and remote copies and selects the valid chain with the greatest length .
Summary of Key Components : External crate used to create immutable digital fingerprints (hashes) of block data . and : Used in the mining process to find the correct nonce .
Vector Management: New blocks are added to the chain using after successful validation . 📖 Download the full PDF: https://drive.google.com/file/d/1lSwTULlW53zSJ9b0CGWidDSjmUP9xEiA/view?usp=sharing Part 24 of the Rust Master Class series — STEM EdTech | Automation Consulting | Rust Tutoring RustLang #Programming #LearnToCode #STEM #EdTech