Build the Next Block
You’re the miner: scarce space, best fee-per-space wins — not first come, first served.
Pack the next blockPlayground
Short interactives that make one Bitcoin idea click.
Free from day one. Simulations only — not trading tools, not a wallet, never a place to paste keys.
Coins in your pocket
A wallet balance is a pile of coins — you spend whole ones and often get change back.
See your balance as coinsFee pressure dial
Fees rise when more people want the next block’s limited space than it can hold.
See why fees spikeBitcoin flow
Transactions arrive continuously, wait in the mempool, and leave when a block claims them — capacity is paced by blocks, not internet speed.
Soon