BLOCKCHAIN QUESTLevel 1 of 3

Level 1: Blockchain Fundamentals

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Fundamentals

Smart Contracts

Oracles & Web3

Sector 01: Cryptographic Core & P2P Network

Mission Objective: Mine and validate 6 canonical blocks by mastering SHA-256 hashes, Merkle trees, gossip, and distributed consensus.

Canonical Block Chain · Level 1

0 / 6 validated blocks

Block Structure & Cryptography

Question 1 of 6

Why does retroactively modifying a transaction in an older block break the integrity of the subsequent chain?