Practice Test Geeks(C4) CryptoCurrency Certification Consortium Practice Test
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C4 Wallet Security & Key Management Flashcards

6 cards from real C4 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 C4 Wallet Security & Key Management flashcards as text

  1. What is a watch-only wallet?

    Answer: A wallet that holds the public keys/addresses only, allowing balance monitoring without the ability to spend funds

    A watch-only wallet contains only public keys or addresses, enabling balance and transaction monitoring without storing private keys on the device.

  2. What does the derivation path m/44'/0'/0'/0/0 signify in an HD wallet?

    Answer: A BIP44 Bitcoin mainnet address at account 0, external chain, index 0

    BIP44 defines the path m/purpose'/coin_type'/account'/change/index; 44' = BIP44, 0' = Bitcoin, 0' = account 0, 0 = external, 0 = first address.

  3. What is the main risk associated with using a brain wallet (a wallet whose private key is derived from a memorized passphrase)?

    Answer: Human-chosen passphrases have low entropy and are vulnerable to dictionary attacks

    Brain wallets derived from memorable phrases have far less entropy than randomly generated seeds, making them highly susceptible to dictionary and brute-force attacks.

  4. Which practice best mitigates the risk of a single point of failure in cryptocurrency key storage?

    Answer: Geographic distribution of encrypted backups and/or multisig setups

    Distributing backups geographically and/or using multisig removes single points of failure, protecting against fire, theft, or hardware failure at any one location.

  5. What is the significance of the checksum in a BIP39 mnemonic seed phrase?

    Answer: It detects transcription errors by appending a hash of the entropy to validate the word list

    BIP39 appends the first bits of the SHA-256 hash of the entropy as a checksum, allowing wallets to detect typos or invalid word sequences.

  6. In the context of C4 certification, what is operational security (OPSEC) as it applies to managing cryptocurrency keys?

    Answer: Practices that minimize information leakage about wallet holdings, addresses, and key storage methods to potential adversaries

    OPSEC in crypto key management means limiting disclosure of wallet addresses, balances, and storage methods to reduce targeting by attackers.

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Sources & references

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  1. cryptoconsortium.org — Renewal, retake fee, retake policy, score release, eligibility, exam format, passing score, test dates, time limit, score validity · verified Oct 2026