🔐 Practical Guide to ZKP: Learn Real Usecase of ZKP with Plonky2

The HashChainCircuit example you've provided is a practical application of zero-knowledge proofs (ZKPs) using Plonky2, specifically demonstrating how to prove that an ordered sequence of operations has been correctly performed without revealing the underlying data. Here's a breakdown and continuation of your code snippet:

Concept Recap

The HashChainCircuit concept involves creating a chain of hashes where each hash is derived from the previous state concatenated with a new item. This ensures that any modification to an intermediate item will change the final hash, allowing for verification of integrity without revealing individual items.

Code Breakdown

Initialization and Setup

rust
 
1use crate::utils::poseidon_hash_out::PoseidonHashOutTarget;
2
3pub struct HashChainCircuit {
4    pub data: CircuitData<F, C, D>,
5    pub items: Vec<Target>,
6}
7
8impl HashChainCircuit {
9    pub fn new(chain_length: usize) -> Self {
10        let config = CircuitConfig::standard_recursion_config();
11        let mut builder = CircuitBuilder::<F, D>::new(config);
12
13        // Create a target (slot) for each item in the chain
14        let items: Vec<Target> = (0..
15
16[Read the full article at DEV Community](https://dev.to/toshiya_matsumoto_ac94abe/practical-guide-to-zkp-learn-real-usecase-of-zkp-with-plonky2-408l)
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