O que é Fee rate (sat/vB)?

A transaction paying a large total fee but occupying a lot of space can be less attractive to a miner than a small one paying less in absolute terms. What matters is revenue per unit of scarce block space.

A typical single-input, two-output native SegWit spend is around 141 virtual bytes, which is the reference size our fee estimator uses to translate a rate into a real cost.