Ethereum: Create custom software with distributed hash tables
As an emerging developer, it is probably familiar with the concept of blockchains and intelligent contracts. However, creating a fully functional blockchain -based application from the ground can be a discouraging task. In this article we will examine how to create custom software with C#, use distributed hash tables (DHT), a decisive component in many blockchain applications.
What is a distributed hash table?
A DHT is a data structure that enables efficient storage and restoration of large amounts of data by distributing nodes via a network. In the context of blockchains, DHT is often used to store data in connection with transactions such as hashes, blocks and other metadata.
Why use C#?
C
is a popular option for blockchain applications based on your:
- Strong support for distributed systems
- Easy development with libraries such as Entity Framework Core (EF Core) and Cosmosdb
- Native integration into the Ethereum Virtual Machine (EVM)
Building a personalized DHT in C#
To create a personalized DHT, you must understand how you can design and implement a data structure that can efficiently store and restore data. Here is a sample implementation of a DHT with C#:
`Charp
With the system;
with system.collectionss.generic;
with system.threading.taks;
Dhtnode Public Class
{
Hash {get public chain; Location; }
Public list
Public Dhtnode (Kettenhaash)
{
Hash = hash;
Elements = new
}
}
Dhitem Public Class
{
public chain data {get; Location; }
}
DHStore Public Class
{
Private reading dictionary
Public empty Addhash (Kettenhash, Dhtitem element)
{
if (! _nodes.trygetvalue (hash, out var node)))
{
Node = new dhtnode (hash);
_nodes.add (hash, knot);
}
node.items.add (item);
}
Public Dhtnode Gethash (hash of the chain)
{
return _nodes.trygetvalue (hash, out var node)? Knot: zero;
}
}
Implementation of intelligent contracts
In order to create intelligent contracts that interact with the DHT, you have to understand how the Solidity programming language is used by Ethereum. Here you will find an example -implementation of a simple intelligent contract, the data stored and repeated using the DHT:
Solidity
Pragma solidity ^0.8.0;
Data data contract {
Mapping (address => uint256 []) public data torros;
Mapping (string => uint256 []) public hashdatostores;
Addhash function (chain storage _hash, uint256 [] _data) public {
For (uint256 i = 0; i <_data.length; i ++) {
if (! dataer [_hash] [i]) {
Data torros [_hash] .push (_data [i]);
}
Others {
Hashdatostores [_hash] .push (i);
}
}
}
Function Getdataash (String Memory _Hash) Public Vista Return (Uint256 []) {
Return data transport [_hash];
}
GetData function (String memory _hash) Public Vista Returns (Uint256 []) {
return hashdatostores [_hash];
}
}
`
Example of application cases
Here are some cases of examples of your personalized DHT and your intelligent contract:
* Transaction validation : The blockchain -based application can validate transactions that check the hashes of the corresponding transaction elements.
* Execution of smart contract : Your intelligent contract can execute its logic based on DHT elements, e.g. B. the update of the chain or activation events.
Diploma
Creating a personalized DHT and an intelligent contract in C
is an excellent way to create robust blockchain applications.
