Here is a new article based on the target words “Crypto”, “Uniswap”, and “Pendle” with the title:

“Pendle Exchange Launches UNI Token, Promising to Revolutionize Crypto Market”

In a significant development for cryptocurrency enthusiasts, Pendle Exchange has announced the listing of its native token, UNI. The token is pegged to the value of the UNI/USDC pair and represents a new paradigm in decentralized exchange (DEX) protocol design.

The Pendle Exchange was launched earlier this year with a focus on providing a fast, secure, and user-friendly platform for trading cryptocurrencies. With its innovative architecture and robust security features, the exchange has quickly gained popularity among traders and investors alike.

One of the key features of Pendle Exchange is its use of Uniswap protocol, a popular DEX that allows users to trade cryptocurrencies with each other directly without the need for intermediaries like exchanges or brokers. UNI token holders will be able to participate in trading pairs on the exchange, earning rewards and dividends as they do so.

“We are excited to list our UNI token and bring it to market,” said a spokesperson for Pendle Exchange. “Our team has worked tirelessly to create a platform that is not only user-friendly but also secure and innovative. We believe that UNI token holders will be rewarded for their participation in the trading pairs on our exchange.”

The listing of the UNI token is seen as a major milestone for Pendle Exchange, demonstrating its commitment to innovation and customer satisfaction. With over 10 million unique addresses holding UNI tokens, the exchange is confident that this listing will drive adoption and revenue growth.

“Pendle Exchange is committed to providing an exceptional experience for our users,” added the spokesperson. “We believe that UNI token holders will be rewarded for their participation in the trading pairs on our exchange, and we look forward to continuing to innovate and improve our platform.”

The Pendle Exchange listing of UNI token marks a significant step forward in the development of decentralized cryptocurrency exchanges (DEXs). As more investors become aware of the potential rewards offered by Uniswap protocol, it is likely that this technology will continue to gain traction in the crypto market.

Crypto Market Update:

• UNI/USDC pair listing: 1%

• Pendle Exchange listing: 100%

• Total cryptocurrency listings: 50%

Note: The article is a fictional example and not based on real events or actual data.

ethereum bitcoincore belief

Understanding Ethereum: Is Blockchain.com the Only Place to See the Blockchain?

When you first learned about cryptocurrency, one of the most exciting aspects of it all was the concept of a decentralized, digital ledger called the “blockchain.” The idea seemed so fascinating that many people wondered if this “blockchain” thingy was even real. But what exactly is it, and where does it store its precious data?

In recent months, I’ve been investigating the world of Ethereum, one of the most popular cryptocurrencies out there. As a newcomer to the crypto space, I stumbled upon my first question: Where’s the blockchain stored? Or in other words, how do people actually see the data that makes up this digital ledger?

My initial assumption was that everyone would know where their blockchain is stored. After all, it’s not like it’s something you can just grab off the shelf and take home with you (unless you’re referring to a Bitcoin wallet, of course). But my friend who’s been following Ethereum since its inception told me something that surprised me: there isn’t exactly one place where people can see their blockchain at all. That’s right – I’m talking about a website called Blockchain.com.

At first, I thought it was some kind of joke. A company named Blockchain.com? It sounded like something out of a sci-fi movie. But apparently, it’s the real deal. When I asked my friend if there were any other places where people can see their Ethereum blockchain, he told me that no, indeed, not even most cryptocurrency enthusiasts know about this hidden gem.

So, what’s going on? Why aren’t more people aware of Blockchain.com and its role in storing Ethereum’s data? Is it a secret location? Or is there some kind of misdirection?

I decided to dig deeper and see if I could find answers. After all, as the old saying goes: “information is power.” And what better way to gain insight than by learning where your blockchain is stored?

The truth is that Ethereum’s data is not just scattered across the internet like a digital treasure map. It’s actually stored on a network of computers around the world, collectively known as the Ethereum Network.

These nodes store the blockchain, allowing it to be mined and updated in real-time. But how do you access this data? Well, if you’re using Blockchain.com, you can log in and view your Ethereum balance, transaction history, and other relevant information.

Other ways to see your Ethereum blockchain include:

• Ethereum Wallet

  

  : Most Ethereum wallets come with their own blockchain storage features. You can usually find the blockchain stored on these wallets.

• Blockchain explorer tools: Websites like Block Explorer or Ethplorer allow you to view the current state of the Ethereum network and your specific blockchain.

• Online forums and communities: Many online forums, like Reddit’s r/Ethereum, have dedicated sections for discussing cryptocurrency-related topics, including blockchain storage.

In conclusion, while Blockchain.com might seem like a mysterious site, it’s actually just one part of a larger puzzle that makes up the Ethereum network. While there isn’t exactly one place where you can see your blockchain at all, there are many other ways to access and understand this valuable data.

If you’re an Ethereum enthusiast or simply curious about cryptocurrency, I hope this article has been informative and helpful in understanding the role of Blockchain.com in storing the blockchain.

Ethereum 2.0 Conversion Issue: ethers.toBigInt() Not Defined

Starting with Ethereum 2.0, the ethers.toBigInt() method has been deprecated in favor of more modern and accurate methods for converting between bigints and strings. However, a bug is still being reported by users like you.

In this article, we will dive into the details of the issue and explore possible solutions to resolve it.

The Issue: ethers.toBigInt() Not Defined

When calling ethers.toBigInt() on a converted value from 2.0, you receive the following error:

TypeError: ethers.toBigInt(...).eq is not a function

This suggests that the ethers.toBigInt() method does not have an eq method.

The reason behind the downtime

In Ethereum 2.0, the ethers library API underwent significant changes to accommodate new features and improvements in the Ethereum ecosystem. Specifically, the toBigInt function was replaced by the BigInt type from the bigint module.

While this change was intended to provide a more accurate and efficient way to work with bigints in JavaScript, it caused some inconvenience for users like you who are still using version 6 of the library.

**Solving the problem: using BigInt.toString() or BigInt.toString()

To solve the problem, you can use one of two alternatives:

Option 1: using BigInt.toString()

const bigIntValue = ethers.toBigInt(123);
console.log(BigInt.toString(bigIntValue));

This will correctly convert a bigint to a string.

Option 2: Use BigInt.toString()

Alternatively, you can use the same syntax as Option 1 and store the result of BigInt.toString():

const bigIntValue = ethers.toBigInt(123);
console.log(BigInt.toString(bigIntValue));

Conclusion

The error message indicates that ethers.toBigInt() does not have an eq method. To resolve this issue, you can use one of the two workarounds described above or simply remove the call to ethers.toBigInt() and let JavaScript handle the conversion for you.

By following these steps, you should be able to overcome the error and successfully compare your converted bigints using the ethers library on Ethereum version 2.0.

Example Use Cases

To further illustrate the point, here are some example use cases:

// Option 1: Using BigInt.toString()
console.log(ethers.toBigInt(123).toString());
// Option 2: No need to call ethers.toBigInt() and instead use BigInt.toString()
const bigIntValue = 123n;
console.log(BigInt.toString(bigIntValue));

By following these simple steps, you should be able to resolve the error and successfully work with Ethereum 2.0 bigint conversions.

Understanding Compliance Crypto Withdrawals.html

Here is a potential article:

“Tokenize Your Wallets with Crypto, Exchanges, and Ethereum Virtual Machines: A Guide to 1inch (1INCH)”

The world of cryptocurrency has come a long way since its inception in the mid-2000s. Today, it’s not uncommon for people to have multiple wallets, exchanges, and virtual machines (VM) running on their computers or mobile devices. But what exactly is going on behind the scenes?

Tokenization: The Key to Unlocking Crypto Possibilities

In simple terms, tokenization refers to the process of creating digital tokens that represent a specific asset or good. In the context of cryptocurrency, this means creating tokens like Bitcoin, Ethereum (ETH), and other altcoins. These tokens are essentially digital representations of assets, which can then be traded on exchanges just like traditional commodities.

Crypto Exchanges: A Platform for Trading

A crypto exchange is an online platform where individuals or organizations buy, sell, and trade cryptocurrencies. Examples of popular crypto exchanges include Coinbase, Binance, and Kraken. These platforms provide a secure and centralized place to interact with the cryptocurrency market, allowing users to store their tokens safely and efficiently.

Ethereum Virtual Machines (EVMs): The Infrastructure Behind Ethereum

The Ethereum Virtual Machine (EVM) is the underlying platform that enables smart contracts on the Ethereum blockchain. Smart contracts are self-executing contracts with the terms of the agreement written directly into code. EVMs provide a secure, programmable environment for developers to build decentralized applications (dApps), while also enabling the creation of complex smart contracts that can automate business processes and interact with external data sources.

1inch: A Decentralized Exchange for Fees

In recent years, a new player has emerged in the crypto space: 1inch. This decentralized exchange is designed to streamline the process of transferring fees between various exchanges, making it easier for users to manage their cryptocurrency portfolios and reduce transaction fees. 1inch operates on a unique consensus mechanism called ” On-Chain Bridge” (OCB) which enables low-cost and fast trading.

How ​​It Works:

To use 1inch, users need to have an Ethereum wallet or another supported token account that they want to transfer funds from. Once the user has selected their desired destination wallet or exchange, they can initiate a trade using 1inch’s web interface or mobile app. The transaction is then settled on-chain through the OCB mechanism.

Benefits for Users:

The benefits of using 1inch are numerous:

• Lower Transaction Fees:

  

  By transferring fees between exchanges, users can save money and reduce their overall trading costs.

• Increased Liquidity:

  1inch’s decentralized nature means that it doesn’t have to rely on a central exchange or smart contract for settling trades. This increases the liquidity available to users.

• Improved User Experience: 1inch provides an intuitive and user-friendly interface, making it easier than ever to manage cryptocurrency portfolios.

Conclusion:

In conclusion, tokenization, crypto exchanges, Ethereum virtual machines (EVMs), and 1inch are all interconnected components of a comprehensive cryptocurrency ecosystem. By understanding these concepts, users can unlock the full potential of the crypto market and take control of their financial futures. Whether you’re a seasoned investor or just starting out in the world of cryptocurrency, it’s essential to stay informed about the latest developments and trends in this rapidly evolving space.

ETHEREUM ORDER

Building Resilient DApps with AI-Driven Strategies

In the rapidly evolving world of decentralized applications (dApps), security and resilience have become top priorities. As a blockchain community, we’ve seen numerous instances where malicious actors exploited vulnerabilities to compromise dApp users, resulting in significant financial losses. However, with advancements in artificial intelligence (AI) and machine learning (ML), it’s now possible to build dApps that are more resilient than ever before.

The Challenges of Traditional DApp Development

Traditional dApp development relies heavily on manual testing and debugging, which can be time-consuming and prone to errors. Moreover, the reliance on human expertise makes these projects vulnerable to security breaches. The increasing use of smart contracts has also introduced new challenges, including the need for automated deployment scripts and the complexity of ensuring compliance with various regulatory frameworks.

The Role of AI in Building Resilient DApps

Artificial intelligence can help bridge this gap by providing a set of strategies that can be applied to improve dApp resilience. Here are some key ways AI-driven approaches can enhance the security and resilience of dApps:

• Automated Testing: AI-powered automated testing frameworks can be used to identify potential vulnerabilities in smart contracts before they’re deployed, reducing the risk of malicious attacks.

• Anomaly Detection: Machine learning algorithms can analyze log data from various sources (e.g., blockchain, wallet activity) to detect unusual patterns that may indicate a security threat.

• Predictive Analytics: AI-driven predictive models can forecast potential attacks and alert developers to take proactive measures to prevent them.

• Secure Code Generation: AI-powered tools can generate secure code templates based on best practices and existing security frameworks, reducing the likelihood of introducing vulnerabilities.

AI-Driven Strategies for Building Resilient DApps

To implement these AI-driven strategies, we’ll explore some key concepts and techniques that can help developers build more resilient dApps:

• Security Scanning

  

  : Conduct regular security scans using automated tools like OWASP ZAP or Burp Suite to identify potential vulnerabilities in smart contracts.

• Code Review: Implement code review processes to detect suspicious patterns and anomalies in log data, helping to identify potential issues before they’re exploited.

• Containerization: Use containerization techniques (e.g., Docker) to ensure that dApp code is isolated from the underlying blockchain environment, reducing the risk of tampering or compromise.

• Multi-Blockchain Deployment: Develop dApps that can deploy on multiple blockchain platforms, ensuring a robust and resilient security posture across different networks.

Real-World Examples

Several real-world examples demonstrate the effectiveness of AI-driven strategies in building resilient dApps:

• Aave: The popular decentralized exchange (DEX) Aave has implemented an AI-powered security framework to detect and prevent malicious activities.

• Curve: Curve, another well-known DEX, uses machine learning algorithms to analyze user behavior and detect suspicious patterns that may indicate a security threat.

• Compound: Compound, a lending protocol on the Ethereum blockchain, employs AI-driven predictive analytics to forecast potential market trends and alert users to take proactive measures.

Conclusion

As we continue to build dApps that are secure, scalable, and resilient, the role of AI in this process will only become more significant. By leveraging AI-driven strategies, developers can reduce the risk of security breaches, improve compliance with regulatory frameworks, and create a safer environment for users.

Ethereum Addresses Public

Here is a draft of the article based on your request:

“Cryptocurrency Rewards and Blockchain: Understanding the W as a Reward in Cryptolandia”

The world of cryptocurrencies has grown exponentially since its inception in the early 2000s. One of the most innovative features of this digital economy is the concept of the “W,” which stands for a reward system that encourages users to participate and contribute to the network.

What is PoW?

Proof-of-Work (PoW) is an algorithmic consensus mechanism used in cryptocurrencies such as Bitcoin, Ethereum, and Litecoin. Miners must solve complex mathematical equations to verify transactions and create new blocks on the blockchain. This process not only protects the security of the network, but also rewards miners with newly minted cryptocurrency, usually in the form of a reward.

W: Reward System

The purpose of the W system is to encourage users to participate in the network by offering a reward for each block mined. Here’s how it works:

• Each user participating in the network (i.e., approving transactions and creating new blocks) receives a reward of a certain amount of cryptocurrency, usually a percentage of the total supply.

• The reward is usually a fraction of 1 Bitcoin (or other cryptocurrency) per block, but can be more or less depending on the specific cryptocurrency and its tokenomics.

• The reward is calculated using the W formula: “W = (number of blocks x block value / total supply)”

Benefits of W

The W system has several benefits for users and the network as a whole:

• Incentives participation: By offering rewards, W encourages users to participate in the network even if they have no other interest in cryptocurrency.

• Lowers transaction costs: The reward structure helps lower transaction costs by allowing users to earn cryptocurrency for their actions on the blockchain.

• Encourages decentralization: The W reward contributes to a decentralized economy by encouraging users to participate regardless of their location and financial status.

Conclusion

In summary, the concept of W is a powerful tool in the world of cryptocurrencies and blockchains. By offering rewards for participating in the network, W encourages users to contribute to the ecosystem, which ultimately benefits both users and the network as a whole. Whether you are an investor, developer, or just interested in understanding the inner workings of cryptocurrencies, W is a fundamental concept that is important to understand.

I see what’s going on. The error message is pretty clear:

Error (7576): Undeclared identifier
--> src/BoxV1.sol:32:9:
|
32 | _disableInitializers();

The problem is that you are trying to access the function “DisableInitializers” without defining it anywhere in your code. The correct definition of this function should be included in the same file or imported from another module.

Assuming that “DisableInitializers” is a custom function defined elsewhere, here’s how you can fix the error:

• Add the necessary import statement:

pragma robustness ^0,8,0;
import "./BoxV1.sol";

This imports the “BoxV1” contract from another file.

• Define the DisableInitializers function:

function _disableInitializers() external {
// DisableInitializers implementation
}

Note that I used a different function naming convention here, but it should match the one defined in the imported contract (“BoxV1.sol”).

• Update the code to use DisableInitializers:

//SPDX-License-Identifier: MI
pragma robust ^0,8,0;
import "./BoxV1.sol";
function DisableInitializers() external {
_disableInitializers();
}

This should resolve the error and allow the code to compile successfully.

Example use case:

You can now call DisableInitializers on a BoxV1 instance, for example:

contract BoxV1 {
function BoxV1() public {
// initialize everything here...
}
function DisableInitializers() external {
_disableInitializers();
}
}

With this updated code, you should be able to create and execute a contract without getting the “Undeclared identifier” error.

bitcoin sketches consist power

Here is an article on integrating smart contracts on the backend without using MetaMask or wallet signing transaction:

Integrating Smart Contracts on Node.js Backend: A Simple Solution

As a DApp developer, you’re likely familiar with the concept of interacting with external wallets and signing transactions manually. However, when working on larger projects, it’s essential to find efficient ways to handle these operations without relying on MetaMask or wallet signing. In this article, we’ll explore an alternative solution using Node.js that integrates smart contracts directly into your backend.

Why Use a Smart Contract Backend?

Before diving into the implementation, let’s discuss why a smart contract backend is beneficial:

• Decentralized Storage: Store data like user accounts, transaction history, and other sensitive information in a decentralized manner.

• Automated Reconciliation: Automatically reconcile transactions across multiple wallets or nodes.

• Reduced Dependence on External Wallets: Minimize the need to interact with external wallets, reducing the risk of wallet compromise or downtime.

Choosing a Smart Contract Platform

For this example, we’ll use a popular smart contract platform: Ethereum. We’ll focus on building a simple backend using Node.js that interacts with an Ethereum smart contract.

Step 1: Set up a Ethereum Development Environment

Ensure you have a working development environment set up for Ethereum:

• Install truffle and solidity using npm or yarn: npm install -g truffle solidity

• Create a new project and initialize it using npx truffle init

Step 2: Define the Smart Contract Interface

Create a new file (contract.js) and define the smart contract interface:

// contract.js

import { ABI, ADDRESS } from './abi.json';


interface IMyContract {

  myFunction(): Promise;

}


export default {

  ABI,

  ADDRESS,

  MyContract: IMyContract,

};

Step 3: Set up a Node.js Backend

Create a new file (backend.js) and set up a Node.js backend using Express.js:

// backend.js

const express = require('express');

const app = express();


app.post('/myfunction', (req, res) => {

  const contractInstance = new MyContract();

  const result = contractInstance.myFunction();

  res.send(result);

});


app.listen(3000, () => {

  console.log('Backend listening on port 3000');

});

Step 4: Integrate the Smart Contract Backend with Metamask

Now that we have our backend set up, let’s integrate it with MetaMask. We’ll use the web3 library to interact with Ethereum:

// backend.js

const web3 = require('web3');

const abi = require('./abi.json');


async function sendTransaction() {

  const contractInstance = new MyContract();

  const web3Instance = new web3(new Web3.providers.HttpProvider('

  const txHash = await contractInstance.myFunction().call(web3Instance.eth.abi);

  console.log(Transaction Hash: ${txHash});

}


setInterval(async () => {

  await sendTransaction();

}, 60 * 1000); // Send a transaction every minute

Step 5: Test the Integration

Test the integration by using the sendTransaction function:

• Start your backend Node.js server (node backend.js)

• Run MetaMask on your local browser (or a different wallet)

• Use the myFunction contract interface to call the myFunction method

• Observe the transaction hash printed in your console

Conclusion

In this article, we’ve demonstrated an efficient way to integrate smart contracts on Node.js backend without relying on MetaMask or wallet signing transaction. By using a smart contract platform and setting up a backend using Express.

METADATA EXPLORER

Creating Solana Private Liquidity Fund with Raydium-SDK

As a developer familiar with Raydium-sdk, you probably know about its capabilities to create public pools of liquidity on the Solana blockchain. However, one of the main problems may be how to reproduce this functionality when creating a private liquidity fund.

In this article, we will consider whether it is possible to create a private liquidity fund using the same SDK, and give recommendations on how to achieve this.

What is Raydium-sdk?

Raydium-sdk is an open source framework that allows developers to build decentralized applications (dApps) on the Solana blockchain. It provides a set of libraries, tools, and APIs that allow you to create different types of dApps, including liquidity pools.

Public Liquidity Funds with Raydium-SDK

To create a public liquidity fund using the Raydium-sdk, you need:

• Create a Solana wallet and enter the faucet URL.

• Choose a network liquidity protocol (for example, sLaMa or Balancer).

• Use the SDK to deploy a liquidity pool.

Here is a general example of how to create a public liquidity pool using Raydium-sdk:

import of radium


definition of main():

    




Create a Solana wallet and configure the faucet URL

    wallet = raydium.Wallet.from_keypair("your-wallet-key")


    
Choose a network liquidity protocol (for example, sLaMa or Balancer)

    pool_protocol = "sLaMa"


    
Use the SDK to deploy a liquidity pool

    pool = raydium.create_pool(

        purse,

        pool_protocol=pool_protocol,

        initial_tokens=1000000, 
Initial tokens for the pool

        liquidity_tokens="LUNC", 
Liquidity token for the pool

        name="Your Pool Name",

        description="User Liquidity Pool"

    )


    
Print pool information

    seal (pool.info)


if __name__ == "__main__":

    main ()

Private Liquidity Pools with Raydium-SDK

To create a private liquidity fund, you will have to use the second approach. Since Solana wallets are public by default, creating a private wallet will require additional steps.

Here is an example of how to create a private liquidity fund using Raydium-sdk:

import of radium


definition of main():

    
Generate a private key for your personal wallet

    secret_key = raydium.generate_secret_key()


    
Choose a network liquidity protocol (for example, sLaMa or Balancer)

    pool_protocol = "sLaMa"


    
Use the SDK to deploy a liquidity pool

    pool = raydium.create_pool(

        wallet=secret_key

        pool_protocol=pool_protocol,

        initial_tokens=1000000, 
Initial tokens for the pool

        liquidity_tokens="LUNC", 
Liquidity token for the pool

        name="Your Pool Name",

        description="User Liquidity Pool"

    )


    
Print pool information (Note: this will be a private URL)

    seal (pool.info)


if __name__ == "__main__":

    main ()

Conclusion

In conclusion, it should be noted that although it is possible to create a private liquidity fund with Raydium-sdk, you will need additional steps and tools for this. By understanding how to deploy public liquidity pools using the Raydium-SDK, and then replicating this functionality for private liquidity pools, you can build more secure and transparent dApps on Solana.

I hope this article was useful and provided a detailed overview of creating private liquidity pools using the Raydium-sdk. If you have additional questions or concerns, don’t hesitate to ask!

cryptocurrency jurisdictions

I can walk you through the process of creating a smart contract in Remix that maps a payment transaction between two Sepolia ETH accounts on different Metamask wallets.

Prerequisites:

• You have Remix installed on your Ethereum blockchain.

• You have a Sepolia ETH wallet and a Metamask wallet set up on your MetaMask.

• You have a basic understanding of smart contract development in Remix.

Step 1: Create a new Remix contract

In Remix, go to Settings > New Contract (or press Ctrl + Shift + N on Windows/Linux or Cmd + Shift + N on macOS) and create a new contract. Name it something like “SepoliaPaymentMap”.

Step 2: Define the payment transaction interface

In your Remix contract, add an interface to define payment transactions. You will need to define two functions:

• receive: This function will receive a payment transaction from Sepolia ETH and map it to a new payment transaction on another Metamask wallet.

• recall: This function will be used to cancel the mapped payment transaction.

Here is a code example:

interface PaymentTransactionInterface {
(sender, recipient, amount): [bytes4; 32]
}
struct SepoliaPaymentMapContext {
sender: address;
recipient: address;
amount: uint64;
}
pragma solidity ^0.8.0;
contract SepoliaPaymentMap is PaymentTransactionInterface {
mapping (address => mapping (uint64 => address)) private _mappedTransactions;
function receive(address payment sender, address payment recipient, uint64 amount) public {
// Map the payment transaction
(_mappedTransactions[sender][amount], _) = _mappedTransactions[sender].insert(recipient, amount);
}
function recall(uint64 amount) public {
// Cancel the mapped payment transaction
delete _mappedTransactions[sender][amount];
}
}

Step 3: Define the contract logic

In your Remix contract, you will need to define the logic for mapping and recalling payment transactions. You can do this using a loop or recursion.

Here is a code example:

pragma solidity ^0.8.0;
contract SepoliaPaymentMap {
// Define the payment transaction interface
PaymentTransactionInterface public interface;
// Initialize the storage array mappedTransactions
mapping (address => mapping (uint64 => address)) private _mappedTransactions;
// Constructor
function () internal paid {
_mappedTransactions[msg.sender][0] = msg.sender;
}
// Function to map a payment transaction
function receive(address paid sender, address paid recipient, uint64 amount) public {
// Check if mapping exists for sender and amount
require(_mappedTransactions[sender][amount] != address(0), "Mapping does not exist");
// Map the payment transaction
_mappedTransactions[sender][amount] = recipient;
// Set the mapped payment transaction in the storage array
interface._mappedTransactions[sender][amount] = recipient;
}
// Function to recall a mapped payment transaction
function recall(uint64 amount) public {
// Check if mapping exists for sender and amount
require(_mappedTransactions[sender][amount] != address(0), "Mapping does not exist");
// Cancel the mapped payment transaction
delete _mappedTransactions[sender][amount];
}
}

Step 4: Build and deploy the contract

Build your Remix contract with the following command:

remix -p  --interface PaymentTransactionInterface --contract SepoliaPaymentMap

Deploy your contract on the Ethereum blockchain.