DEV Community: OstryKot

Zero-Knowledge Proof (ZKP) – A Simple Example and Its Application in Blockchain

OstryKot — Wed, 02 Apr 2025 21:26:34 +0000

What is a Zero-Knowledge Proof (ZKP)?

A Zero-Knowledge Proof (ZKP) is a cryptographic method that allows one party (the prover) to convince another party (the verifier) that they know a certain piece of information without revealing the information itself. In other words, it enables the validation of data without disclosing its content.

Key Features of ZKP:

Completeness – If the statement is true, the prover can convince the verifier.
Soundness – If the statement is false, no one can deceive the verifier.
Zero-Knowledge – The verifier learns nothing beyond the fact that the statement is true.

A Simple Example: Ali Baba’s Cave

Zero-Knowledge Proofs are crucial for privacy and scalability in blockchain. Here are some key applications:

1. Private Transactions (Zcash, Monero)

Zcash uses zk-SNARKs (a type of ZKP) to hide the sender, receiver, and transaction amount while ensuring validity.
Verifiers can confirm a transaction is correct without seeing its details.

2. Scalability (Ethereum, zk-Rollups)

zk-Rollups use ZKPs to bundle multiple transactions into a single proof, reducing network load.
Ethereum verifies an entire batch of transactions with one ZKP instead of processing each individually.

3. Authentication Without Data Exposure

Proving sufficient funds in an account without revealing the balance.
Confirming age (>18) without disclosing the exact birth date.

Conclusion

Zero-Knowledge Proofs are a groundbreaking technology that combines privacy and security. By leveraging ZKPs, blockchain can become more discreet and efficient while maintaining full verifiability. As cryptography advances, ZKPs will play an increasingly vital role in the digital economy.

Cryptocurrency Wallet Scams – How Do Seed Phrase and Multisig Smart Contract Scams Work?

OstryKot — Mon, 31 Mar 2025 17:14:39 +0000

In the world of cryptocurrencies, where anonymity and decentralization reign, scammers are constantly devising new ways to steal funds. One of the more sophisticated schemes gaining traction on social media platforms like YouTube and Facebook involves fake seed phrases and multisig smart contracts. Let’s dive into how this scam operates, why it’s so effective, and how you can protect yourself.

How Does This Scam Work?
It all starts with a seemingly innocent comment on social media. A user, posing as a confused beginner, posts a plea for help: “I can’t recover 4,000 USDT from my wallet. Here’s my seed phrase—can someone assist me?” Alongside the message, they provide a 12- or 24-word recovery phrase, supposedly granting access to a wallet loaded with cryptocurrency. For many, this looks like a golden opportunity—who wouldn’t want to claim 4,000 USDT?

Enticed by the prospect of easy money, the victim uses the seed phrase in an app like MetaMask or Trust Wallet. Upon logging in, they see a balance—sure enough, there’s 4,000 USDT. Excited, they attempt to transfer the funds to their own wallet. But here’s the catch: to execute a transaction on the blockchain, native tokens (e.g., ETH on Ethereum or TRX on Tron) are needed to cover gas fees. Since the wallet lacks these tokens, the victim sends their own—say, 0.01 ETH—to enable the transfer.

The Multisig Smart Contract Trap
After sending the native tokens, the victim tries to complete the USDT transfer, only to find it fails. Why? The wallet isn’t a standard address—it’s a multisig smart contract requiring at least two signatures (private keys) to authorize transactions. The victim knows only one key—the one from the provided seed phrase—while the second remains in the scammer’s possession. Without that second signature, neither the USDT nor the deposited native tokens can be withdrawn.

Worse still, in many cases, the smart contract is programmed to automatically redirect the native tokens to another address controlled by the scammer as soon as they’re deposited. The victim loses their funds (e.g., 0.01 ETH), and the 4,000 USDT? It’s often just bait—sometimes not even real tokens, but a fake balance displayed by the contract.

Why Does It Work?
This scheme exploits several factors:

Greed: The sight of a large sum of money clouds judgment.
Lack of Technical Knowledge: Few users understand how multisig smart contracts work or can distinguish them from regular wallets.
Apparent Credibility: A publicly shared seed phrase looks like an amateur mistake, lowering suspicion.
Automation: Scammers often use bots to monitor the wallet and instantly snatch deposited tokens before the victim catches on.

How to Protect Yourself?
Here are some key tips:

Never Trust Public Seed Phrases: No sane person would share their wallet’s recovery phrase publicly—it’s always a red flag.
Verify Addresses: Before sending any funds, check the address on a blockchain explorer (e.g., Etherscan, TronScan). Smart contracts differ from regular addresses and often have additional functionality.
Don’t Send Tokens to Unknown Wallets: If you need to deposit native tokens to “unlock” funds, that’s a warning sign.
Educate Yourself: Learn the basics of cryptocurrencies, smart contracts, and multisig to better understand what you’re dealing with.

Conclusion
The seed phrase and multisig smart contract scam is a clever trap that blends blockchain technology with human naivety. Scammers create an illusion of easy profit, leveraging advanced mechanisms like multisignature contracts and automatic fund redirection. The key to staying safe? Caution and skepticism—if something seems too good to be true, it probably is. In the crypto world, the mantra “not your seed, not your coins” can be your best ally.

What is Web3? Differences Between Web2 and Web3

OstryKot — Thu, 27 Feb 2025 09:24:47 +0000

Web3 is the next evolution of the internet, aiming to decentralize the web and give control over data and content back to users. To understand what Web3 is, it’s helpful to first look at its predecessors: Web1 and Web2.

Web1: The Era of Static Websites

Web1, the first generation of the internet, lasted from the early 1990s to the early 2000s. It was a static internet where users could mainly browse content published by a small number of creators. Websites were simple, built on HTML, and user interaction was minimal. Web1 can be compared to a digital library, where users were passive consumers of information.

Web2: The Era of Interaction and Social Media

Web2, which dominated the internet from the 2000s to 2020, introduced dynamic websites, social media platforms, and web applications. Users gained the ability to create and share content, comment, like, and collaborate online. Companies like Facebook, Google, YouTube, and Twitter became central hubs of the internet, collecting vast amounts of user data. Web2 is characterized by centralization, where control over data and content lies in the hands of corporations.

Web3: The Era of Decentralization and User Ownership

Web3 is a vision of the internet where power and control are distributed, and users have full ownership of their data and digital assets. Key technologies of Web3 include blockchain, cryptocurrencies, smart contracts, and decentralized applications (dApps). In Web3, users don’t need to rely on intermediaries like banks, social media platforms, or cloud service providers. Instead, transactions and interactions are direct, secure, and transparent thanks to blockchain technology.

Key Differences Between Web2 and Web3

Decentralization vs. Centralization: Web2 relies on centralized servers controlled by corporations, while Web3 uses decentralized blockchain networks.
Data Ownership: In Web2, companies collect and monetize user data, whereas in Web3, users have full control over their data.
Payments and Digital Economy: Web2 uses traditional payment systems, while Web3 leverages cryptocurrencies and tokens.
Security and Privacy: Web3 offers a higher level of security and privacy through encryption and decentralization.
Interactivity and Smart Contracts: Web3 introduces smart contracts, which automate transactions and agreements.

Examples of Web3 Applications

Web3 is being applied in various areas, such as:

DeFi (Decentralized Finance): Decentralized financial platforms that enable loans, investments, and transactions without banks.
NFTs (Non-Fungible Tokens): Digital certificates of ownership that allow trading unique artworks or virtual items.
DAOs (Decentralized Autonomous Organizations): Community-driven organizations where decisions are made democratically.

Challenges of Web3

Despite its promises, Web3 still faces many challenges, such as scalability, energy consumption by blockchains, lack of legal regulations, and low accessibility for average users.

Conclusion

Web3 is a revolutionary vision of the internet that aims to give power back to users through decentralization, transparency, and data ownership. Although the technology is still in its early stages, its potential to change how we use the internet is immense. Unlike Web2, where corporations dominate, Web3 puts the user at the center, offering new financial, social, and technological opportunities.