No one person owned the wall. No one could delete the past. For the first time, the people of Ledgerville didn't need to trust each other—they only had to trust the math. 💡 Decentralized: Everyone has a copy; no middleman. Immutable: Once it's written, it can't be changed. Transparent: Anyone can see the history of transactions.
If one person tried to cheat, their copy wouldn't match the rest of the town's. The Basics of Blockchain
Before a block could be added to the wall, it had to include a "fingerprint" of the previous block. This linked them together. If someone tried to change a single letter in an old block, the fingerprint would change, and the entire chain would visibly break. The Network No one person owned the wall