How Blockchain Works

Original slide files are available in the local preview. Public distribution is pending source-material review.

What we covered

Explained how a network of computers shares a record of transactions.
Used a three-block diagram to show how digital fingerprints, called hashes, link records and reveal changes.
Compared blockchain with bank records and introduced how networks agree on new transactions.
Explored uses beyond cryptocurrency, then reviewed the concepts and wallet safety through trivia.

Optional review questions

Choose an answer to review the meeting material. This quiz checks the presentation’s answer key, not current market knowledge. Historical or ambiguous answers carry notes. Responses are not saved.

1. What makes a blockchain hard to change?A secret admin passwordHidden cloud filesCryptography linking blocksA single locked server

Source: Question and answer: PDF pages 8–9

2. Why is a blockchain called "decentralized"?It needs a central bankIt’s stored on many computers worldwideOnly one person controls itIt runs on one big computer

Source: Question and answer: PDF pages 10–11

3. What does a "block" in blockchain contain?A user’s wallet historyA user’s emailA list of computers securing the networkA list of transactions

Source: Question and answer: PDF pages 12–13

4. Who created Bitcoin?Satoshi NakamotoBill GatesSteve JobsA bank CEO

Source: Question and answer: PDF pages 14–15

5. What do Bitcoin miners use to earn rewards?Social media postsBlock analysis toolsComputers solving math puzzlesOnline spreadsheets

Source: Question and answer: PDF pages 16–17

6. How many bitcoins will ever exist?1 trillionUnlimited100 million21 million

Source: Question and answer: PDF pages 18–19

7. What is a meme coin usually based on?Government policiesInternet jokes or trendsA serious business planGold reserves

Source: Question and answer: PDF pages 20–21

8. Why are meme coins risky to buy?Their value can drop fastThey’re fun to ownThey’re hard to sellThey’re only for kids

Source: Question and answer: PDF pages 22–23

9. What’s the most important thing to keep secret in your crypto wallet?Your tokensYour phone numberYour seed phraseYour email address

Source: Question and answer: PDF pages 24–25

10. What’s a clue you’re dealing with a crypto scam?A colorful websiteA free app downloadA text from a friendA promise of quick riches

Source: Question and answer: PDF pages 26–27