An educational sandbox built to demystify cryptography, blocks, mining, and immutable ledgers through live interaction.
Disclaimer: This project is a blockchain simulator for educational purposes only. It is not a real blockchain network, financial product, or investment tool.
Every block has a unique fingerprint called a Hash (using SHA-256). Try creating a block. Note the long string of text under "Current Hash". If you alter even one letter of a transaction later, that hash changes completely (known as the Avalanche Effect).
Before transactions hit the blockchain, they wait in a staging area called the Mempool (Memory Pool). Use the form on the right to add a transaction, and watch it sit in the staging queue until you mine it.
To prevent spam, miners must solve a puzzle: find a hash starting with specific characters (our difficulty is set to start with "00"). The computer keeps changing a random number called a Nonce until it hits a valid combination. Click "Mine" and notice how many attempts (Nonce value) it takes!
Try This: Mine 2 or 3 blocks. Then, go back to Block #1 and edit the text inside its entry box. Watch what happens! The modified block flashes red because its hash broke, breaking the connection to every block following it.