Have you heard of cryptocurrencies like Bitcoin and Ethereum? The BBC micro:bit, a popular educational tool, now offers a fun and simplified way to understand these concepts through micro:coin! This project introduces the fundamentals of blockchain technology in a hands-on, engaging manner, perfect for beginners and educators.
How micro:bit Creates Digital Coins
Each micro:bit device simulates a blockchain—a secure, unchangeable sequence of data blocks. In this context, each block represents a coin. The process of generating new coins is called _mining_. To mine a micro:coin, simply shake your micro:bit. If you're lucky, a new block (coin) is added to your chain!
Once a block is added, it's broadcast to other micro:bit devices via radio. Since the blockchain is public and tamper-proof, sharing it is safe. Other devices receive the new block, validate it, and update their own blockchains accordingly. This mirrors how real decentralized networks operate.
Understanding Blocks, Chains, and Cryptocurrency
A blockchain is a distributed ledger that records transactions in a crypto network. Each block contains data such as its creation time and miner identity. Crucially, every block includes a _hash_—a unique digital fingerprint generated from the previous block's data and hash. This chaining mechanism ensures security: altering any block would invalidate all subsequent hashes, making fraud virtually impossible.
The micro:coin project demonstrates these principles in a tangible way, helping users grasp complex ideas like decentralization, consensus, and cryptographic security.
Start Mining Your micro:coins
Ready to begin? Here's how to interact with your micro:coin blockchain:
- Press button A to display the number of blocks (coins) you've mined—this is your score.
- Press button B to view the total length of the blockchain.
- Shake the device to attempt mining a new coin.
Happy mining! Remember, consistency pays off in building your chain.
Protect Your Digital Assets
Just like real cryptocurrencies, your micro:coins need safekeeping. Consider building a secure storage system to practice good digital habits. 👉 Explore beginner-friendly crypto storage tips
Implementing micro:coin with MakeCode
The micro:coin project uses the radio-blockchain extension in Microsoft MakeCode. Follow these steps to set it up:
- Open the MakeCode for micro:bit editor.
- Click Advanced > Extensions.
- Search for "blockchain" and add the radio-blockchain package.
Here's the essential code snippet for mining and tracking coins:
// Shaking triggers mining
input.onGesture(Gesture.Shake, function () {
led.stopAnimation();
basic.clearScreen();
basic.pause(200); // Brief pause for effect
if (randint(0, 2) == 0) { // 30% chance to succeed
blockchain.addBlock(1); // Add a new block
basic.showIcon(IconNames.Diamond); // Success icon
} else {
basic.showIcon(IconNames.Asleep); // Missed attempt
}
});
// Display mined coins
input.onButtonPressed(Button.A, function () {
led.stopAnimation();
let coins = blockchain.valuesFrom(blockchain.id()).length;
basic.showNumber(coins);
basic.showString("COINS");
});
// Display blockchain length
input.onButtonPressed(Button.B, function () {
led.stopAnimation();
basic.showNumber(blockchain.length());
basic.showString("BLOCKS");
});
// Initial instructions
basic.showString("A=COINS B=CHAIN SHAKE=MINE");How the Blockchain Code Operates
The radio-blockchain extension uses radio communication to sync blocks between micro:bits. The underlying code is written in TypeScript and available as open-source. Key functions include:
- Block creation: Generating new blocks with hashes based on previous data.
- Consensus mechanism: Validating and accepting blocks from other devices.
- Data integrity: Ensuring the chain remains immutable and transparent.
For a deeper dive, review the main.ts file on GitHub, which contains the full implementation.
Frequently Asked Questions
What is the educational value of micro:coin?
micro:coin teaches core blockchain concepts like mining, hashing, and decentralization without complex math. It's ideal for classrooms and workshops to spark interest in computer science and cryptography.
How does shaking the micro:bit mimic real mining?
In real crypto networks, mining requires solving computational puzzles. Shaking the micro:bit simulates this effort through a random chance mechanism, emphasizing the resource-intensive nature of mining.
Can micro:coins be transferred between devices?
Yes! The radio communication allows blocks to be shared, mirroring peer-to-peer transactions. However, this is a simulation and has no real monetary value.
Is this project suitable for absolute beginners?
Absolutely. The visual feedback and simple controls make it accessible for ages 8 and up. It requires no prior coding or crypto knowledge.
How secure is the micro:bit blockchain?
While simplified, it uses cryptographic hashing to prevent tampering. It's secure for educational purposes but not for real financial transactions.
Where can I learn more about blockchain technology?
Check out the references below or 👉 discover advanced learning resources for deeper insights into crypto networks.
References and Further Reading
- "A blockchain in 200 lines of code". _Medium_.
- "Let’s Build the Tiniest Blockchain". _Medium_.
- "How does the blockchain work?". _Medium_.
Note: The micro:coin project is for educational purposes only and is not affiliated with any real cryptocurrency.