Beginner
What the hell is blockchain, really? — Check your understanding
Page 7 of 7 — Section 7 of 7
User Beginner
7/7 — What the hell is blockchain, really? — Check your understanding
Key points
- Hash link:Why does changing one page force you to redo later pages? (Because each block commits to the previous hash; one change breaks every later link.)
- Consensus:Who decides which block is next on a public chain? (Many independent nodes/validators following the rules; the majority chain wins.)
- Tamper signal:How can anyone spot that a block was edited? (Hashes and Merkle roots would differ; explorers would show a different parent/tx root.)
- Why does a public:Explorer give more confidence than a wallet screenshot? (Anyone can independently verify the hash, from/to/value, and confirmations.)
- Confirmations:Why do more blocks make a transaction harder to replace? (An attacker would need to outpace all honest nodes from that depth forward.)