BLOCK1/10

FEES0sats

TIME16.0

0% full 0 / 0 vB 0 txs — sat/vB

Grab the highest fee-rate (sat/vB) — rate beats size.

Best 0 sats

BLOCK BUILDER

You're a Bitcoin miner. Build the most valuable block.

A block has limited space, measured in vB (virtual bytes — a transaction's size). Only what fits gets mined.
Each tx pays a fee rate = sat/vB — what it pays per unit of space. That's the big number on every tile.
Space is scarce, so grab the highest fee-rate txs and pack the block full. Rate beats size.

Same space — very different reward:

5200 vB

= 1,000 sats

50200 vB

= 10,000 sats · grab this

RUN COMPLETE

0 sats mined

Efficiency0% of the best-play target (0 sats a perfect miner would earn from the same txs)

Block space is limited (vB). Miners fill it with the highest fee-rate (sat/vB) txs to earn the most. That's the fee market.