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title: WEB3 CODING BOOTCAMP AT BLOCKFUSELABS WEEK 2

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**WEB3 CODING BOOTCAMP AT BLOCKFUSELABS  
WEEK 2**  

The second week of my coding bootcamp was packed with new knowledge and hands-on experiences that built upon the foundation set in Week One. We focused on concepts such as peer-to-peer networks, hash algorithms, Merkle trees, Quasi-Turing Networks, Hierarchical Deterministic wallets, Uniswap, and Ethereum accounts. We even built a Hierarchical Deterministic wallet!  

There's a clear difference between how data is transferred between a client and a server in Web3. Unlike in Web2, where the client sends a 'request' to the server and the server sends a 'response,' in Web3, both the client and server can send requests and responses. This is called a **peer-to-peer** network. Each entity in this network is called a node, and nodes can store, send, retrieve, and manipulate data.  
![Screenshot from 2025-01-18 21-10-31](https://hackmd.io/_uploads/Syq_0YKvkx.png)  

**Hash algorithms** are one of the most fascinating concepts I've learned about. They involve passing an input through a hash function to get an output of a fixed length. Regardless of the size or type of the input, the output will always have the same length.  
Here are a few properties of hash algorithms:  
* You can't convert the output back to its input.  
* You can't infer the input from its output.  
* The output will always have a fixed length, regardless of the size or type of the input data.  

**Merkle Tree** is a binary tree data structure used to validate all transactions in a block.  
It involves hashing (using a hash function) the hash of transactions in an upward flow until only the root hash (Merkle root) remains.  
![Screenshot from 2025-01-18 21-11-26](https://hackmd.io/_uploads/SJTFRFYwJl.png)  

So far, I've loved our classes and all the tasks given to us. I'm looking forward to achieving more in the subsequent weeks!