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Ethereum: Building Custom Software with Distributed Hash Tables

As a novice developer, you’re probably familiar with the concept of blockchains and smart contracts. However, building a fully functional blockchain application from scratch can be a daunting task. In this article, we’ll take a look at how to build custom software using C

that leverages distributed hash tables (DHTs), a key component of many blockchain applications.

What is a Distributed Hash Table?

A DHT is a data structure that allows for the efficient storage and retrieval of large amounts of data by distributing it across a network of nodes. In the context of blockchains, DHTs are often used to store transaction-related data such as hashes, blocks, and other metadata.

Why Use C#?

C

is a popular choice for building blockchain applications because of:

• Strong support for distributed systems

• Ease of development with libraries like Entity Framework Core (EF Core) and CosmosDB

• Native integration with the Ethereum Virtual Machine (EVM)

Building a Custom DHT in C#

To build a custom DHT, you need to understand how to design and implement a data structure that can efficiently store and retrieve data. Here’s an example of implementing a DHT using C#:

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
public class DHTNode
{
public string Hash { get; a set; }
public List Items { get; a set; }
public DHTNode(string hash)
{
Hash = hash;
Items = new List();
}
}
public class DHTItem
{
public string data { get; a set; }
}
public class DHTStore
{
private readonly Dictionary _nodes = new Dictionary();
public void AddHash(string hash, DHTItem element)
{
if (!_nodes.TryGetValue(hash, out var node))
{
node = new DHTNode(hash);
_nodes.Add(hash, node);
}
node.Items.Add(item);
}
public DHTNode GetHash(string hash)
{
return _nodes.TryGetValue(hash, out var node) ? node : null;
}
}

Implementing Smart Contracts

To create smart contracts that interact with DHTs, you need to understand how to use the Ethereum Solidity programming language. Here is an example of implementing a simple smart contract that stores and retrieves data using DHT:

pragma solidity ^0.8.0;
contract DataStore {
mapping(address => uint256[]) public dataStores;
mapping(string => uint256[]) public hashDatastores;
function addHash(string memory _hash, uint256[] memory _data) public {
for (uint256 i = 0; i < _data.length; i++) {
if (!dataStores[_hash][i]) {
dataStores[_hash].push(_data[i]);
}
else {
hashDatastores[_hash].push(i);
}
}
}
function getDataHash(string memory _hash) public view returns (uint256[] memory) {
return dataStores[_hash];
}
function getData(string memory _hash) public view returns (uint256[]) {
return hashDatastores[_hash];
}
}

Example Use Cases

Here are some sample use cases for your custom DHT and smart contract:

• Transaction Validation: Your blockchain application can validate transactions by checking transaction data hashes against their corresponding DHT elements.

• Smart Contract Execution: Your smart contract can execute its logic based on DHT elements, such as updating the chain or triggering events.

Conclusion

Creating a custom DHT and smart contract in C

is a great way to build robust blockchain applications.