ArtOfBlockChain
ArtOfBlockChain
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  • Difficulty - Medium
    Total Plays - 1
    Allowed Time - 10 sec
    Best time - 10 sec

    Why are multi-step writes risky?

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    Explanation:
    Multi-step operations can leave the contract in a partially updated state if execution halts. Attackers exploit these interim states to bypass checks.
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    Explanation:
    EXTCODESIZE checks if the target has code deployed. It helps detect contracts vs EOAs in validation logic
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    Explanation:
    If the implementation contract is self-destructed, proxies break permanently or redirect unexpectedly. This creates bricked contracts and undefined behavior
  • Difficulty - Medium
    Total Plays - 2
    Allowed Time - 10 sec
    Best time - 10 sec

    What does RETURNDATASIZE prevent?

    Tip: Click "Play" to reveal options and start playing.
    #A
    #B
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    #D
    Explanation:
    RETURNDATASIZE ensures the caller knows exactly how many bytes were returned. It prevents incorrect assumptions and truncation bugs during low-level calls.
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  • Application deadline: 4 weeks
    Z

    Solidity Engineer, Gateway

    Zama • FULL_TIME • NA

    Job description
    Zama, an open-source cryptography company focused on Fully Homomorphic Encryption for blockchain, is hiring a Solidity Engineer for the Gateway team, which supports the core execution flow of the Zama Confidential Blockchain Protocol. The position involves building smart contract infrastructure to support rollup operations and trust controls such as DAO...
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  • Application deadline: 4 weeks
    Job description
    Zama, an open-source cryptography company advancing Fully Homomorphic Encryption solutions for blockchain, is hiring a Developer Experience Engineer to support the adoption of its main product, fhevm. This role focuses on designing and maintaining developer-facing tools that help blockchain engineers integrate Zama’s encryption-based functionality into applications using tools like Solidity...
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  • Application deadline: 4 weeks
    E

    Integrations Engineer (Web3)

    ENS Labs • FULL_TIME • NA

    Job description
    ENS Labs, the development team behind the Ethereum Name Service protocol, is seeking a Web3-focused Integrations Engineer to advance ENS adoption across wallets, SDKs, dApps, L2 networks, developer libraries, and other crypto infrastructure. This role combines hands-on engineering work with external collaboration, contributing code directly to open-source projects that integrate...
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  • Application deadline: 4 weeks
    S

    Backend Developer for Blockchain Services

    SatoshiLabs • FULL_TIME • NA

    Job description
    SatoshiLabs, the company behind Trezor and the first hardware wallet in the industry, such as Recovery Seeds and Shamir Backup, is seeking a Backend Developer to support and expand its blockchain infrastructure. The role involves developing services that interface with multiple crypto networks, integrating external data services, managing backend performance,...
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  • Application deadline: 4 weeks
    S

    Full-stack Developer (Node.js/TypeScript)

    SatoshiLabs • FULL_TIME • NA

    Job description
    SatoshiLabs, the company behind Trezor and the first hardware wallet in the industry, is hiring a Full-stack Developer to support the development of trading features within Trezor Suite. The role focuses on backend development for a trading aggregator that connects with multiple centralized and decentralized exchange APIs. The position also...
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  • Application deadline: 4 weeks
    E

    DevOps Engineer — Senior/Staff

    ENS Labs • FULL_TIME • NA

    Job description
    ENS Labs, the core development team behind the Ethereum Name Service protocol, is hiring a Senior/Staff-level DevOps Engineer to manage and maintain the infrastructure that supports ENS resolution across multiple chains. This role oversees operational reliability for core services such as metadata systems, indexing services, CCIP-Read gateways, and emerging Namechain/L2...
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