Blockchain 101 Certification Study Guide 2026
Everything you need to pass the Blockchain 101 Certification exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 Blockchain 101 Certification Exam Format at a Glance
📚 Blockchain 101 Certification Topics to Study (21)
✍️ Sample Blockchain 101 Certification Questions & Answers
1. What is the primary difference between a hot wallet and a cold wallet?
Hot wallets maintain an active internet connection making them convenient but more vulnerable, while cold wallets are stored offline providing greater security.
2. What is the MOST important consideration when implementing system architecture & design solutions in Blockchain 101?
Technology solutions must align with organizational needs and scale appropriately to deliver value both now and in the future.
3. What is 'flash loan' functionality in DeFi smart contracts?
Flash loans allow anyone to borrow large amounts without collateral as long as the principal plus fee is returned within the same atomic transaction.
4. What does the term 'uncle block' (ommer block) refer to in Ethereum?
Uncle blocks are valid blocks mined at the same time as the canonical block but not included in the main chain; Ethereum rewards miners for them to reduce centralization.
5. What distinguishes a 'soft fork' from a 'hard fork' in blockchain protocol upgrades?
A soft fork introduces tighter rules that old nodes still accept, while a hard fork creates incompatible rules requiring all nodes to upgrade.
6. Which performance monitoring & optimization tool is MOST valuable for identifying root causes in Blockchain 101?
Root cause analysis with systematic methods identifies underlying causes rather than symptoms, leading to lasting solutions.