Lab 3 — Blockchain Creation

Goal

Understand block mining, parent hashes, nonces, and chain validity.

Tools

• Board: https://unidraw.io/app/board/71d2106c5ed5c65ab20b?allow_guest=true
• Hasher / BitStory: https://joshorndorff.github.io/BitStory/bitStoryLive.html

Tasks

1. Create several transactions.
2. Mine a block by finding a nonce that satisfies the difficulty target.
3. Add the block to the shared board.
4. Verify that each block references the previous block hash.
5. Break one block and observe how the following blocks become invalid.

Deliverable

Screenshot or link showing your mined block and nonce.