Blockchain in the context of COVID-19

Maciej Zieliński

16 Apr 2020
Blockchain in the context of COVID-19

The world's pandemic is constantly affecting our daily lives, forcing us to redefine our view of many branches of life and business. Recent days have brought many dynamic changes, and more are constantly appearing on the horizon. But are there also new opportunities besides new problems? Where can blockchain allow us to adapt to the current situation?

Supply and distribution of medicines and medical equipment

In crisis situations, the management of the supply of medicines and medical equipment is a key issue which, as the covid-19 pandemic shows, should be secured globally, and any mistake can have tragic consequences for hundreds of patients. The current situation shows how flawed modern systems can be, which are unable to protect us e.g. from periodic shortages of products as important as masks.

 The supply chains of protection agents or medicines are extremely sensitive and susceptible to manipulation, and many parties with different and sometimes even conflicting interests are involved in them. Blockchain provides a secure platform to solve this problem, introducing greater data transparency and better product traceability. Because a blockchain record can only be verified and updated with a "smart contract", manipulating the block chain is also very difficult. 

Blockchain allows to work out a compromise and trust at protocol level between all parties involved. This is crucial in situations where demand for a particular product exceeds supply and product availability may prove to be inadequate to actual demand. Blockchain can allow us to create a decentralised system for the distribution of medicines in which the interests of one party do not take precedence over the other. 

One of the companies working to secure the drug supply chain using blockchain and IoT technology is Chronicled. The company has been on the market for several years now, implementing decentralized supply chain ecosystems and building a protocol-based solution to improve global trade in key industries, including pharmaceuticals.

Banking services  

The world's coronavirus pandemic forces us to redefine our view of many branches of business. Sources such as The Economist and Forbes have been telling us for several weeks about the real risk of a global economic crisis comparable to that of 2008. One of the sectors that are certainly facing dynamic changes is the financial one. 

Before 2008, banks had little competition, which allowed them to monopolise financial services. This allowed them to charge high commissions, add hidden fees to the rates offered or overstate currency margins. It was them who dictated the conditions - if the consumer needed money he could only go to them. When it comes to the financial services market, there was practically no other choice. Customers often followed the rules created by banks, which were often unfavorable for them, because they usually had no other viable options. 

However, the events that started with the collapse of Lehman Brothers in September 2008 led to an accumulation of aversion to the financial system at the time, which was accompanied by a general lack of confidence in the banking sector. Changes in customer mentality triggered a demand for different solutions from the previous ones, which created an opportunity for new players to enter a market where they started to offer better, more competitive services. This has triggered dynamic changes in the industry. 

An example of using blockchain technology on the banking services market is Request. This decentralised network based on Ethereum enables users to, among other things, perform transactions between themselves, send or request payments or issue invoices. Whereas developed by Symbiont and Ipreo companies Synaps  using blockchain-based smart contracts seeks to improve and automate the market for credit syndicates. 

Today, when the coronavirus pandemic brings with it another threat of financial crisis, the demand for fintech is likely to increase sharply again. Many consumers will lose confidence in the traditional form of banking services and start looking for alternative options. Again, this will create an opportunity for those who will offer new, innovative products based on modern technologies such as blockchain, offering opportunities such as peer to peer transactions or the decentralisation of asset transfer. 

Verification of identity

The reduction of social relations contributes to the growing popularity of remote communication tools. This will create a demand for solutions for authentication of digital certificates and identities verified by cryptography, not by the participation of a person. Basing the verification process on blockchain is simply cheaper and more secure than using a third party.  At a time when the lack of trust in relationships, especially business relationships, seems to be a common problem, obtaining it at the level of IT protocol seems to be a solution created for the needs of the modern market 

An example of a company operating in this area is Spanish Validated ID provide digital identity solutions designed primarily for remote working and e-commerce. Their ViDSigner is a comprehensive electronic signature service that allows users to issue honored signatures in several ways - including a sliding card, biometric signature or automatic seal.

New, safer asset transfer methods

Transferring business interactions to the Internet will increase the demand for secure asset transfer methods. Blockchain seems to be the ideal solution here. For several years now, we have been observing how the tokenization and trading of assets in a decentralized system based on it is gaining popularity in various industries, including those as different from each other as real estate and music. When a blockchain occurs, the need to engage an external third party disappears, so that asset transfer processes can be faster and become cheaper to maintain. Additionally, recording transaction data in the blockchain reduces their vulnerability to manipulation or fraud. 

Such solutions are implemented by 2014, among others, by the company Bitmark, which claims that although modern societies have developed property rights and intellectual property rights, they have not protected digital content. Therefore, through the use of blockchain technology, it enables the transfer of digital content in a peer to peer system, including health data, digital art collections, music rights and medical records.  

Certificates of authenticity based on cryptography

According to Maciej Jędrzejczyk. CEE Blockchain Leader’a at IBM  may reveal many inaccuracies in the supply chain depending on demand and production from China. This will lead to the disclosure of counterfeit certificates of authenticity of parts of the products originating from there. As he predicts, "this will lead manufacturers to use irrefutable proofs of origin based on cryptography rather than on authority".

Blockchain can record transactions in the supply chain and provide a unique identity for each product unit, tracking its journey in the supply chain. In addition, the unit can be paired with an NFC chip, QR code or RFID tag to enable real-time digital recording of progress. The Shanghai company is already working on this mechanism VeChain dealing with the problem of authenticating luxury goods. 

Hope for the entertainment industry

The entertainment industry seems to be one of the most affected by the outbreak. Thousands of cancelled concerts, festivals and other music events have brought and will bring losses of many millions. In a market dominated by giants such as Spotify, iTunes and YouTube, the creators will suffer most. While streaming portals are more active, the royalties paid to artists represent only a small percentage of the profits from playing their music. Blockchain-based portals such as Opus and Vezt, which are able to pay artists almost 100% of the profits thanks to the use of blockchain technology, become an alternative for artists. For many artists, they can be the key to survival in such a rapidly changing market. 

The consequences of the current situation will be coming back to us severely in the coming months. However, in addition to numerous threats, there are also new opportunities. It is up to us whether we will be able to take advantage of them and limit the losses resulting from the pandemic. The technology may again prove to be irreplaceable here. We will probably need modern solutions such as blockchain as never before.

Reducing losses, solving current problems and adapting to upcoming changes are areas where modern technology will prove necessary. In the context of an epidemic, many blockchain-based solutions turn out to be even more valid, there are also new areas where the implication of this technology may be the most optimal choice. The coming weeks will require the implementation of significant changes in many branches of business, without a doubt blockchain is a technology able to do this.

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The Ultimate Web3 Backend Guide: Supercharge dApps with APIs

Tomasz Dybowski

04 Mar 2025
The Ultimate Web3 Backend Guide: Supercharge dApps with APIs

Introduction

Web3 backend development is essential for building scalable, efficient and decentralized applications (dApps) on EVM-compatible blockchains like Ethereum, Polygon, and Base. A robust Web3 backend enables off-chain computations, efficient data management and better security, ensuring seamless interaction between smart contracts, databases and frontend applications.

Unlike traditional Web2 applications that rely entirely on centralized servers, Web3 applications aim to minimize reliance on centralized entities. However, full decentralization isn't always possible or practical, especially when it comes to high-performance requirements, user authentication or storing large datasets. A well-structured backend in Web3 ensures that these limitations are addressed, allowing for a seamless user experience while maintaining decentralization where it matters most.

Furthermore, dApps require efficient backend solutions to handle real-time data processing, reduce latency, and provide smooth user interactions. Without a well-integrated backend, users may experience delays in transactions, inconsistencies in data retrieval, and inefficiencies in accessing decentralized services. Consequently, Web3 backend development is a crucial component in ensuring a balance between decentralization, security, and functionality.

This article explores:

  • When and why Web3 dApps need a backend
  • Why not all applications should be fully on-chain
  • Architecture examples of hybrid dApps
  • A comparison between APIs and blockchain-based logic

This post kicks off a Web3 backend development series, where we focus on the technical aspects of implementing Web3 backend solutions for decentralized applications.

Why Do Some Web3 Projects Need a Backend?

Web3 applications seek to achieve decentralization, but real-world constraints often necessitate hybrid architectures that include both on-chain and off-chain components. While decentralized smart contracts provide trustless execution, they come with significant limitations, such as high gas fees, slow transaction finality, and the inability to store large amounts of data. A backend helps address these challenges by handling logic and data management more efficiently while still ensuring that core transactions remain secure and verifiable on-chain.

Moreover, Web3 applications must consider user experience. Fully decentralized applications often struggle with slow transaction speeds, which can negatively impact usability. A hybrid backend allows for pre-processing operations off-chain while committing final results to the blockchain. This ensures that users experience fast and responsive interactions without compromising security and transparency.

While decentralization is a core principle of blockchain technology, many dApps still rely on a Web2-style backend for practical reasons:

1. Performance & Scalability in Web3 Backend Development

  • Smart contracts are expensive to execute and require gas fees for every interaction.
  • Offloading non-essential computations to a backend reduces costs and improves performance.
  • Caching and load balancing mechanisms in traditional backends ensure smooth dApp performance and improve response times for dApp users.
  • Event-driven architectures using tools like Redis or Kafka can help manage asynchronous data processing efficiently.

2. Web3 APIs for Data Storage and Off-Chain Access

  • Storing large amounts of data on-chain is impractical due to high costs.
  • APIs allow dApps to store & fetch off-chain data (e.g. user profiles, transaction history).
  • Decentralized storage solutions like IPFS, Arweave and Filecoin can be used for storing immutable data (e.g. NFT metadata), but a Web2 backend helps with indexing and querying structured data efficiently.

3. Advanced Logic & Data Aggregation in Web3 Backend

  • Some dApps need complex business logic that is inefficient or impossible to implement in a smart contract.
  • Backend APIs allow for data aggregation from multiple sources, including oracles (e.g. Chainlink) and off-chain databases.
  • Middleware solutions like The Graph help in indexing blockchain data efficiently, reducing the need for on-chain computation.

4. User Authentication & Role Management in Web3 dApps

  • Many applications require user logins, permissions or KYC compliance.
  • Blockchain does not natively support session-based authentication, requiring a backend for handling this logic.
  • Tools like Firebase Auth, Auth0 or Web3Auth can be used to integrate seamless authentication for Web3 applications.

5. Cost Optimization with Web3 APIs

  • Every change in a smart contract requires a new audit, costing tens of thousands of dollars.
  • By handling logic off-chain where possible, projects can minimize expensive redeployments.
  • Using layer 2 solutions like Optimism, Arbitrum and zkSync can significantly reduce gas costs.

Web3 Backend Development: Tools and Technologies

A modern Web3 backend integrates multiple tools to handle smart contract interactions, data storage, and security. Understanding these tools is crucial to developing a scalable and efficient backend for dApps. Without the right stack, developers may face inefficiencies, security risks, and scaling challenges that limit the adoption of their Web3 applications.

Unlike traditional backend development, Web3 requires additional considerations, such as decentralized authentication, smart contract integration, and secure data management across both on-chain and off-chain environments.

Here’s an overview of the essential Web3 backend tech stack:

1. API Development for Web3 Backend Services

  • Node.js is the go-to backend runtime good for Web3 applications due to its asynchronous event-driven architecture.
  • NestJS is a framework built on top of Node.js, providing modular architecture and TypeScript support for structured backend development.

2. Smart Contract Interaction Libraries for Web3 Backend

  • Ethers.js and Web3.js are TypeScript/JavaScript libraries used for interacting with Ethereum-compatible blockchains.

3. Database Solutions for Web3 Backend

  • PostgreSQL: Structured database used for storing off-chain transactional data.
  • MongoDB: NoSQL database for flexible schema data storage.
  • Firebase: A set of tools used, among other things, for user authentication.
  • The Graph: Decentralized indexing protocol used to query blockchain data efficiently.

4. Cloud Services and Hosting for Web3 APIs

When It Doesn't Make Sense to Go Fully On-Chain

Decentralization is valuable, but it comes at a cost. Fully on-chain applications suffer from performance limitations, high costs and slow execution speeds. For many use cases, a hybrid Web3 architecture that utilizes a mix of blockchain-based and off-chain components provides a more scalable and cost-effective solution.

In some cases, forcing full decentralization is unnecessary and inefficient. A hybrid Web3 architecture balances decentralization and practicality by allowing non-essential logic and data storage to be handled off-chain while maintaining trustless and verifiable interactions on-chain.

The key challenge when designing a hybrid Web3 backend is ensuring that off-chain computations remain auditable and transparent. This can be achieved through cryptographic proofs, hash commitments and off-chain data attestations that anchor trust into the blockchain while improving efficiency.

For example, Optimistic Rollups and ZK-Rollups allow computations to happen off-chain while only submitting finalized data to Ethereum, reducing fees and increasing throughput. Similarly, state channels enable fast, low-cost transactions that only require occasional settlement on-chain.

A well-balanced Web3 backend architecture ensures that critical dApp functionalities remain decentralized while offloading resource-intensive tasks to off-chain systems. This makes applications cheaper, faster and more user-friendly while still adhering to blockchain's principles of transparency and security.

Example: NFT-based Game with Off-Chain Logic

Imagine a Web3 game where users buy, trade and battle NFT-based characters. While asset ownership should be on-chain, other elements like:

  • Game logic (e.g., matchmaking, leaderboard calculations)
  • User profiles & stats
  • Off-chain notifications

can be handled off-chain to improve speed and cost-effectiveness.

Architecture Diagram

Below is an example diagram showing how a hybrid Web3 application splits responsibilities between backend and blockchain components.

Hybrid Web3 Architecture

Comparing Web3 Backend APIs vs. Blockchain-Based Logic

FeatureWeb3 Backend (API)Blockchain (Smart Contracts)
Change ManagementCan be updated easilyEvery change requires a new contract deployment
CostTraditional hosting feesHigh gas fees + costly audits
Data StorageCan store large datasetsLimited and expensive storage
SecuritySecure but relies on centralized infrastructureFully decentralized & trustless
PerformanceFast response timesLimited by blockchain throughput

Reducing Web3 Costs with AI Smart Contract Audit

One of the biggest pain points in Web3 development is the cost of smart contract audits. Each change to the contract code requires a new audit, often costing tens of thousands of dollars.

To address this issue, Nextrope is developing an AI-powered smart contract auditing tool, which:

  • Reduces audit costs by automating code analysis.
  • Speeds up development cycles by catching vulnerabilities early.
  • Improves security by providing quick feedback.

This AI-powered solution will be a game-changer for the industry, making smart contract development more cost-effective and accessible.

Conclusion

Web3 backend development plays a crucial role in scalable and efficient dApps. While full decentralization is ideal in some cases, many projects benefit from a hybrid architecture, where off-chain components optimize performance, reduce costs and improve user experience.

In future posts in this Web3 backend series, we’ll explore specific implementation details, including:

  • How to design a Web3 API for dApps
  • Best practices for integrating backend services
  • Security challenges and solutions

Stay tuned for the next article in this series!

Nextrope Launches “AI-Powered Smart Contract Auditing” Project

Miłosz Mach

03 Mar 2025
Nextrope Launches “AI-Powered Smart Contract Auditing” Project

Next Enterprises Sp. z o.o. is implementing a project co-financed by the European Funds, titled "Smart Contract Auditing with Artificial Intelligence". The goal of the project is to develop and deploy an advanced AI model that enables efficient analysis, vulnerability detection, and security auditing of smart contracts, taking into account their complexity and uniqueness.

Planned Project Tasks:

  • Development of an AI model trained on Solidity keywords;
  • Creation of an effective model in simulated conditions;
  • Analysis of the unpredictability of compiled code execution within the Ethereum Virtual Machine (EVM) in the context of the developed model in a controlled environment;
  • Validation of the model in real-world conditions.

Target Groups:

  • Specialized audit firms focused on smart contract security;
  • Companies developing and/or deploying smart contracts on various platforms;
  • Exchanges, wallet providers, and decentralized applications (dApps) in the blockchain sector;
  • Government agencies or industry compliance bodies responsible for blockchain technology regulation;
  • Smart contract security specialists and developers.

The implementation of the developed tool will enable automated and efficient auditing of smart contracts. The model will provide detailed insights and recommendations for optimizing transaction costs and improving contract performance. As a result, users will be able to make informed decisions, enhancing security and operational efficiency within the blockchain ecosystem. Key benefits stem from the model’s training on smart contract code, audit data, and detected vulnerabilities. Additionally, the incorporation of chaos theory principles will allow for more precise risk and anomaly forecasting.

By deploying this advanced AI model, the project will enhance the security, efficiency, and accessibility of blockchain technology for end users. This will translate into tangible social and economic benefits, including:

  1. Economic Security
  2. Business and Financial Security
  3. Increased Public Trust
  4. Optimization of Transaction Costs
  5. Support for Innovation and Entrepreneurship
  6. Education and Public Awareness

Project Value: 4,173,953.24 PLN
European Funds Contribution: 3,090,156.39 PLN

#EUFunds #EuropeanFunds

Challenges in Smart Contract Auditing

Smart contracts have become a fundamental component of blockchain technology, eliminating intermediaries, and automating processes. However, their growing significance also introduces new challenges, particularly in ensuring security and compliance with industry standards.

Traditional smart contract audits rely heavily on manual code reviews, which are expensive, time-consuming, and prone to human error. As cyber threats continue to evolve, the use of advanced technologies to support the auditing process is imperative.

The Role of AI in Data Analysis

Artificial intelligence (AI) introduces a new paradigm in smart contract security assessment by leveraging its capability to process vast amounts of data and identify patterns that may go unnoticed with traditional auditing methods. AI enables:

  • Automated code analysis and real-time detection of potential vulnerabilities,
  • Optimization of auditing processes by reducing human errors and improving threat identification efficiency,
  • Better adaptation to evolving regulatory requirements and emerging threats within the blockchain ecosystem,
  • Rapid analysis of large datasets, allowing for quick insights and the detection of non-obvious dependencies in smart contract code.

By utilizing AI, the auditing process becomes more comprehensive, precise, and scalable, enabling continuous risk monitoring and adaptation to new attack vectors.

A New Era of Smart Contract Security with AI

With the support of European Funds under the European Funds for a Modern Economy (FENG) program, we are conducting research on next-generation blockchain auditing methods, reinforcing Nextrope’s position as a leader in innovative technology solutions.

The "Smart Contract Auditing with Artificial Intelligence (AI)" project contributes to key aspects of blockchain security by:

  • Automating smart contract audits, accelerating verification processes, and improving their accuracy,
  • Optimizing costs, making professional audits more accessible to a broader range of entities,
  • Raising security standards and enhancing regulatory compliance,
  • Increasing trust in smart contracts, fostering broader technology adoption.

Interested in learning more about our project or discovering how to utilize AI in your company? 📩 Contact us at contact@nextrope.com for further details!

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