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Abdil Hamid
@ForensicBlockSmith • Feb 13, 2026

Feb 13, 2026

1.5K

Hardhat vs Remix for beginners: when building a dApp, what should I use and why?

Hey everyone — I’m new to Ethereum development and building a small dApp (Solidity + ethers.js).I keep seeing “use Hardhat”, but I’m still unclear what Hardhat is used for in...

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AuditWardenRashid
@AuditWarden • Feb 7, 2026

Feb 7, 2026

1.5K

Blockchain Developer vs Data Scientist for Singapore (from Germany): Which path gets hired + EP pass reality in 2025?

I keep seeing people debate blockchain developer vs data scientist, so I’m putting my real situation here. I’m currently based in Germany, and I’m trying to target Singapore roles (either...

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Difficulty - Medium

Total Plays - 24

Allowed Time - 10 sec

Best time - 0.900

Which opcode is deprecated but still callable?

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Explanation:
CALLCODE is deprecated due to unsafe context handling. It remains callable for backward compatibility but should never be used in new designs.

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Difficulty - Medium

Total Plays - 20

Allowed Time - 10 sec

Best time - 1.062

Why avoid multiple SSTOREs in a function?

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Explanation:
SSTORE is one of the most expensive operations and repeating it unnecessarily multiplies costs. Caching values into memory and writing once dramatically optimizes gas. This is foundational in gas-sensitive protocols.

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Difficulty - Medium

Total Plays - 46

Allowed Time - 10 sec

Best time - 0.758

Which hash function does Bitcoin use?

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Explanation:
Bitcoin uses the SHA-256 cryptographic hash function to secure transactions and link blocks in the blockchain. This algorithm produces a fixed 256-bit output, ensuring immutability and resistance to tampering. By using SHA-256, Bitcoin maintains trust, decentralization, and data integrity across the network

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Difficulty - Medium

Total Plays - 38

Allowed Time - 10 sec

Best time - 0.959

What does zk-SNARK stand for?

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Explanation:
zk-SNARKs are zero-knowledge proofs that improve blockchain privacy and scaling by verifying transactions without revealing sensitive data.

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Difficulty - Medium

Total Plays - 31

Allowed Time - 10 sec

Best time - 1.388

What is the purpose of the #[account] macro in Anchor?

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Explanation:
The #[account] macro in Anchor is used to define and validate account structures for Solana smart contracts. It simplifies account management and ensures data integrity.

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Difficulty - Medium

Total Plays - 27

Allowed Time - 10 sec

Best time - 2.943

Which Rust feature ensures type safety in blockchain data structures?

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Explanation:
Rust’s ownership model enforces strict rules on data access, preventing issues like double-spending in blockchain applications. It ensures compile-time safety for complex data structures.

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Difficulty - Medium

Total Plays - 30

Allowed Time - 10 sec

Best time - 1.424

Which platform focuses on NFT-based games?

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Explanation:
Decentraland is a virtual world where users buy land and items as NFTs. It blends gaming and digital ownership.

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Difficulty - Medium

Total Plays - 30

Allowed Time - 10 sec

Best time - 1.157

MetaMask" is a

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Explanation:
MetaMask is a popular cryptocurrency wallet and browser extension that allows users to manage Ethereum-based assets and interact with decentralized applications (dApps). It securely stores private keys, enabling seamless transactions and access to Web3 platforms directly from the browser.

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Difficulty - Medium

Total Plays - 47

Allowed Time - 10 sec

Best time - 1.211

Blockchain Oracles provide

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Explanation:
A blockchain oracle is a service that connects a blockchain with real-world data from outside the network. It helps smart contracts get information like weather, prices, or sports scores so they can work properly.

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Difficulty - Medium

Total Plays - 40

Allowed Time - 10 sec

Best time - 0.706

What does Web3 rely on?

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Explanation:
Web3 uses blockchain to power trustless, decentralized applications.

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Amanda Smith
@AmandaS • Oct 24, 2024

Oct 24, 2024

1.4K

What’s a key reason to consider adopting a blockchain solution?

I’ve been thinking about how blockchain could help solve some of the inefficiencies in supply chain management. For instance, if you could have real-time, tamper-proof tracking of every shipment, wouldn’t...

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ChainMentorNaina
@ChainMentorNaina • Jan 15, 2026

Jan 15, 2026

1.1K

Blockchain for Medical Records and Health Data: Any Real Hiring Demand, or Still Too Early?

I’ve been in blockchain for a while and I keep seeing “blockchain for medical records” and “health data on blockchain” come up in enterprise conversations. On paper it makes sense...

Like 10 Replies 3
AnitaSmartContractSensei
@SmartContractSensei • Jan 9, 2026

Jan 9, 2026

3.1K

Rust dev moving into Web3 — how do you answer ‘Tell me about yourself’ without sounding like a blockchain newbie?

I’m a Rust dev (backend + performance stuff) and I’m interviewing for Web3 roles now. This sounds silly, but “Tell me about yourself” is the one question where I freeze,...

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AshishS
@Web3SecurityPro • Dec 28, 2025

Dec 28, 2025

2.1K

What skills actually matter for UI/UX roles in NFT platforms and decentralized identity?

Looking to get into UI/UX design for blockchain and metaverse projects—what’s the real deal with hiring right now?For those already working on NFT platforms, virtual asset tools, or decentralized ID...

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AuditWardenRashid
@AuditWarden • Dec 18, 2025

Dec 18, 2025

1.0K

Do remote blockchain developer jobs really hire worldwide, or is timezone the real deal-breaker?

Are most blockchain developer jobs truly remote and open worldwide, or does timezone still play a bigger role than people admit? I want to move into blockchain after a career...

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Abdil Hamid
@ForensicBlockSmith • Dec 18, 2025

Dec 18, 2025

1.4K

Will Web3 Create or Kill Cybersecurity Jobs?

I’m currently learning cybersecurity and fascinated by how security frameworks adapt across industries. With Web3’s rise, I keep wondering — does decentralization reduce the need for traditional cybersecurity roles, or...

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AlexDeveloper
@Alexdeveloper • Dec 12, 2025

Dec 12, 2025

979

I’m in my 30s with a commerce degree… is it too late to start a blockchain career?

I’m in my early 30s with a commerce background and feeling stuck in my current path. I’ve been reading about blockchain jobs for the last few months, and it genuinely...

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AlexDeveloper
@Alexdeveloper • Nov 20, 2025

Nov 20, 2025

1.0K

Feeling Lost as a New Blockchain Developer: How Do You Navigate a Confusing Codebase?

I joined a blockchain company three months ago after eight years in backend engineering, including five years with Rust. But this is my first role in Web3 — and the...

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