How the network agrees

1. 1
   Explore levelThe Global Bitcoin Network

   Switch nodes off, slow the links and compare a mesh with a single hub.

   Open the model I've tried it

2. 2
   Explore levelThe Mining Machine

   Make the target smaller and see how many more guesses a block needs.

   Open the model I've tried it

   Optional challenge What is a miner actually doing?

   Solving a meaningful maths problem Guessing numbers until the block header's hash falls below a target Checking other people's passwords Check answer

3. 3
   Explore levelThe Difficulty Engine

   Add hash rate and watch the next adjustment pull the block time back towards ten minutes.

   Open the model I've tried it

   Optional challenge The last 2,016 blocks came much faster than every ten minutes. What happens at the next adjustment?

   Difficulty rises Difficulty falls The block reward rises Check answer

4. 4
   Explore levelThe Blockspace Market

   Fill the mempool and see which transactions make the next block.

   Open the model I've tried it

   Optional challenge Blocks are full. Which transaction is a miner most likely to include first?

   The oldest one The one paying the highest fee rate (sat/vB) The one paying the largest amount Check answer

5. 5
   Advanced levelThe Chain of Blocks

   Compare two branches by cumulative work rather than by length.

   Open the model I've tried it

   Optional challenge Two valid branches compete. Which one do nodes follow?

   The longest one by number of blocks The one with the most cumulative work The one the largest exchange prefers Check answer

6. 6
   Explore levelThe Bitcoin Security Arena

   Give the attacker a majority of hash rate and try the validation gate.

   Open the model I've tried it

   Optional challenge An attacker controls 60 % of all hash rate. What can it still NOT do?

   Reverse its own recent payment Spend coins it has no keys for Delay some transactions Check answer

Finished? Choose another path or explore freely.