# Merkle trees and Verifying Proof-of-Work

This course takes you deeper into **how Merkle Trees support proof-of-work, data integrity, and scalability** across the Bitcoin and BSV network. Building on earlier lessons, you’ll see how mined blocks are broadcast, validated, and stored — and how the blockchain’s design ensures trust and efficiency, even as the ledger grows to global scale.

You will explore:

* How nodes broadcast new blocks to the network and validate each other’s work to maintain consensus.
* Why openness and data sharing between nodes strengthen network efficiency and fairness.
* How the **Coinbase transaction** works — rewarding miners and anchoring every block’s Merkle Tree.
* How the **Merkle root** and block header together secure the chain against tampering or double spending.
* What happens when someone tries to alter a mined block, and how proof of work prevents it.
* How Merkle Trees and UTXO management allow nodes to **prune old data**, saving disk space while keeping every transaction verifiable.

By the end of the course, learners will:

* **Understand how Proof-of-work and Merkle Trees work together** to guarantee blockchain integrity.
* Recognize how blocks link through Merkle roots and headers to form an **unbreakable chain of trust**.
* Appreciate how Bitcoin’s architecture **enables light clients and global scalability without sacrificing verification**.

This course is designed for beginners — no technical background required. It reveals how Bitcoin’s elegant combination of **Merkle Trees and Proof-of-work** keeps data secure, auditable, and efficient, even as the blockchain grows to handle millions of transactions a day.


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