Developers Forum for XinFin XDC Network: Mitali_BlocksScan

Proof of Presence - Hackathon Submission Build on XDCNetwork

Mitali_BlocksScan — Thu, 01 May 2025 18:24:12 +0000

Problem Statement

Traditional presence verification systems are prone to fraud and lack transparency. We need a decentralized, tamper-proof method to prove real-world attendance securely.

🚀 Project Overview

Proof of Presence is a decentralized application (dApp) designed to verify and record the presence of individuals at a specific location or event using blockchain technology. It ensures transparency, immutability, and trust, making it useful for events, conferences, meetups, or even secure facility check-ins.

🛠 Tech Stack

Smart Contracts: Solidity (Ethereum-compatible blockchain - XDC Network)

Backend: Node.js, Express.js
Blockchain Interaction: Web3.js
Wallet Extension : BlocksPay

🧩 Features

✅ Tamper-Proof Attendance
Attendance records are logged on-chain using smart contracts, making them immutable, verifiable, and resistant to fraud or manipulation.
🔒 Privacy-Preserving Verification
Users can prove their presence at events without revealing sensitive personal information, thanks to cryptographic proofs.
🌐 Seamless Integration for Any Event
Easily adaptable for physical or virtual events like conferences, meetups, or workshops—enhancing trust, transparency, and automation in attendance tracking.

📝 Setup Instructions

Pre-requisites
Node.js >= 16.x

Clone the Repository

git clone https://github.com/0xprathamesh/proof-of-presence
cd proof-of-presence

Install Dependencies

npm install

Run the Application

npm run dev

Add Events

Events can be added easily from the admin panel using a clean and intuitive interface designed for smooth event creation and management.

📽️ Demo Video

https://youtu.be/f0ISwW7_wPM

🌍 Deployment

Smart Contract Address: 0xYourDeployedContract
Network: XDC Apothem(Testnet) Network

👨‍💻 Developer Team

Meet the builders behind Proof of Presence:

Prathamesh Patil– Project Lead & Blockchain Integration
Dheeraj Khatiya– Frontend & UI/UX
Mitali Lakhere– Smart Contract Development, Deployment & Testing
Jui Puranik- Documentation & Technical writing

Some more images

We are thrilled to have won the competition 🏆—proof that passion, teamwork, and persistence pay off! 🎉✨

Wallet Address: 0xEAde2298C7d1b5C748103da66D6Dd9Cf204E2AD2

Built with ❤️ for the EthDubai Hackathon 2025 by the Proof of Presence Team.

[Informative] How to Connect your subnet to BlocksPay wallet an easy guide.

Mitali_BlocksScan — Wed, 10 Jan 2024 17:05:19 +0000

Unveil the capabilities of XDC Subnet, a robust innovation enabling the construction of secure, expandable, and decentralized networks within the XDC Ecosystem. This technology facilitates multiple functionalities, from crafting exclusive subnetworks to launching decentralized applications (DApps), presenting a spectrum of potential uses. This comprehensive guide will lead you through the steps of initiating your unique XDC Subnet, ushering in a world of opportunities.

Check out the "XDC Subnet Installation Guide: Building a Secure and Scalable Network."

Let's Connect the BlocksPay to Subnet

Step 1: Download the Wallet extension from BlocksPay

Step 2: Follow wallet instruction to Create a new wallet

Step 3: Click top middle network selector button and "Add a network manually"

Click on "Change Network" and then "Manage Network" button.

Then click on three lines and select "Custom Network".

Enter your Subnet Network details:

Network name: network_name
New RPC URL: http://localhost:8545 or http://<MAIN_IP>:8545
Chain ID: chain_id
Currency symbol: symbol

Once you have filled all the details click on "Add network" button

This is how you will be able to see the subnet network detail on Blockspay

Step 4: Click account selector and "select Import account from another wallet", paste your "grandmaster Private Key"

once you have paste your private key you will be asked to enter your wallet extension password(BlocksPay wallet)for extra security and then "import acount" button.

Step 5: Now access your Subnet URL and access the "Login" tab under the "Management" tab.

Step 6: Once you are on Login Portal, click on the "Connect Wallet" button to connect the XDC Network using BlocksPay Wallet and Click on the "Connect" button of BlocksPay screen.

This is how, your Subnet will connect to BlocksPay Wallet.

Some Reference links:

XDC Subnet Installation Guide Building a Secure and Scalable Network.

Checkout the guide for XDC Subnet user interface

[Informative] Things to remember while setting up XDC-Subnet to avoid failure

Mitali_BlocksScan — Wed, 13 Sep 2023 06:02:28 +0000

Greetings!

This article aims to assist you if you encounter problems while configuring your subnet. If you've set up a subnet and encounter issues, particularly when you face permission denied errors or errors related to images that are already pulled, here are some steps to resolve them:

For Permission Denied Errors:

If you encounter a "permission denied" error when running commands, prepend sudo to your commands like this: sudo your-command.

For Errors Related to Pulled Images:

If you encounter errors indicating that an image is already pulled, follow these steps:

First, check if the Docker system already contains the image by running the command:

sudo docker images

If the image is listed, proceed to delete it by using the following command, replacing <Image ID> with the actual image ID:

sudo docker rmi <Image ID>

Once you've deleted the specific image, return to the video and article guide to set up XDC-Subnet. You can find the guide in the following resources:

We hope these steps help resolve your issues and enable you to successfully set up your XDC-Subnet.

Thank you for reading!

[Informative]Important links and details about XDC Network

Mitali_BlocksScan — Wed, 23 Aug 2023 18:31:37 +0000

Hello Everyone!

Hope this message finds you energised and motivated. We've listed some invaluable resources and links to empower your journey in crafting decentralized applications or unlocking the potential of XDC Network. These tools are poised to elevate your dApp development prowess and unveil the endless possibilities within XDC Network. Keep that curiosity alive and continue your amazing work! Let's #BuildOnXDC together!

Endpoint Details for XDC Network:

For MainNet

RPC:
https://rpc.xdcrpc.com
https://rpc.xinfin.network
https://rpc-xdc.icecreamswap.com
https://rpc1.xinfin.network
eRPC:
https://erpc.xdcrpc.com
https://erpc.xinfin.network
Network ID: 50
Explorer:
https://xdcscan.io/
https://xdc.blocksscan.io/
https://explorer.xinfin.network/
https://xdc.network/

Web Socket:
wss://ws.xinfin.network
wss://ws1.xinfin.network
wss://ews.xinfin.network

For TestNet (Apothem Network):

RPC:
https://rpc.apothem.network
https://apothem.xdcrpc.com
eRPC:
https://erpc.apothem.network
Network ID: 51
Faucet:
https://faucet.apothem.network
https://faucet.blocksscan.io/
Explorer:
https://apothem.xdcscan.io/
https://apothem.blocksscan.io/
https://explorer.apothem.network/

Web Socket:
wss://ws.apothem.network/ws

Wallet extensions:-

BlocksPay:
https://chrome.google.com/webstore/detail/blockspay-secure-multiple/pogabilnghhbafaheaepaaeopjpleimd

XDCPay2.0:
https://chrome.google.com/webstore/detail/xdcpay-20/iidmfamdbddcbjmemafekkohbnfiblhp

XDCPay:
https://chrome.google.com/webstore/detail/xdcpay/bocpokimicclpaiekenaeelehdjllofo

XDC Web Wallet:
https://wallet.xinfin.network/
https://betawallet.xinfin.network
Official Website:
https://xinfin.org/
Integration Guide:
https://xinfin.org/exchange-listing-resource
XDC Network tools:
https://xinfin.org/xdc-chain-network-tools-and-documents
XDC API Links:
https://apidocs.xinfin.network/docs/#xinfin-apis
https://apidocs.xinfin.network/
XDC Document:
https://howto.xinfin.org/
https://docs.xdc.org/
Full Node setup instructions:
https://github.com/XinFinOrg/XinFin-Node
Find other endpoints:
https://chainlist.org/chain/50
https://chainlist.org/chain/51

Keep exploring and developing dApp on XDC Network, need any help post on the XDC.Dev, we are here to help you.

Thank you!
Regards BlocksScan

Connecting Web3 Wallets with WalletConnect and Pure JavaScript: A Step-by-Step Guide

Mitali_BlocksScan — Wed, 21 Jun 2023 07:35:47 +0000

In this article, we will explore the process of integrating WalletConnect into your JavaScript application.

WHAT IS WALLET CONNECT?
WalletConnect is an open-source protocol that facilitates secure and convenient communication between decentralized applications (DApps) and mobile cryptocurrency wallets. With WalletConnect, users can connect their wallets to DApps by scanning a QR code, establishing a secure connection between the wallet and the DApp.

The protocol incorporates end-to-end encryption, guaranteeing the secure transmission of sensitive data like private keys and transaction details between the wallet and the DApp. This ensures that user information remains protected throughout the interaction.

By leveraging WalletConnect, DApps can offer a seamless and secure wallet integration experience to users, enhancing the usability and accessibility of decentralized applications.

WHAT IS JavaScript?
JS is an abbreviation commonly used to refer to JavaScript. JavaScript is a high-level, interpreted programming language that allows developers to add interactive elements and dynamic behavior to websites. It is primarily used for client-side web development, meaning it runs in a user’s web browser, but it can also be used on the server-side with the help of technologies like Node.js.
How to connect the wallet and do a transaction.
Step 1: To setup the code, clone the repository (https://github.com/Mitali-88/wallet-connect)

Once repo gets added to your system, Open the respective folder and start the HTML file.

Here, you will be able to see a screen with 3 buttons and one input field.

Step 2: Click on the “Connect Wallet” button, it will pop up the QR code to scan.

Step 3: Now, open your preferred Android wallet, such as D’cent Wallet, and navigate to the “Discovery” tab. Tap the scanner button at the top left corner to scan the QR code displayed on your app’s interface. Here, you will see the scanner option at the top-left corner, click on that icon and scan the OR code of the D’cent app.

Step 4: Now, you can select the network as XDC Network and address which you want to connect to the app. Your wallet will be successfully connected to the app.

Side by side you can open the network tab to see, if your wallet is connected or not (I have set debug options in the code ).

Step 5: Now coming back to the website, Paste the address in the “To address” field where you want to send XDC. Now click on the “Send Transaction” button .

In this code I have hardcoded the value of amount which is “0.001” XDC, you can change it according to your preferences or you can make it dynamic by adding another input for amount and can handle it, in the backend as I have handled “receiver’s address”.

After clicking on the send transaction button you will get a confirmation-notification on your Android wallet like this.(Refer below Screenshot)

You can see the transaction receipt at the network tab, refer to the below screenshot .

Step 6: To disconnect wallet, click on the “Disconnect wallet” button to close the connection between D’cent wallet and our app.

This is just a base code; you can optimise it according to your need. Let us know your feedback on this article in the comments and do share.

How it works

Follow👇

BlocksScan Youtube Channel

How to Add Custom Tokens in BlocksPay?

Mitali_BlocksScan — Fri, 17 Mar 2023 13:36:23 +0000

Adding a custom token in BlockPay is easy, with a few simple steps.

Step 1: Access the BlocksPay wallet. On the dashboard, simply click on the “Add custom Token” button.

Step 2: Now, Enter the Token’s Contract address and click on the Add Token button.

Step 3: Now you’re good to go. You can see the token gets added to the BlocksPay Wallet.

This is how users can easily store and transfer their favorite tokens on the BlockPay platform.

Explore the BlocksPay and share your feedback with the BlocksScan Team!

BlocksPay Extension Link:- https://chrome.google.com/webstore/detail/blockspay-secure-multiple/pogabilnghhbafaheaepaaeopjpleimd

For any queries, follow BlocksScan — Social channels: