¿Qué es Virtual byte (vB)?
The unit transaction size is measured in for fee purposes, equal to four weight units, introduced so SegWit data is discounted.
SegWit moved signature data into a separate witness section that counts for one weight unit per byte instead of four. A block holds four million weight units, equivalently one million virtual bytes.
This is why SegWit transactions are cheaper: the same economic action occupies fewer virtual bytes and therefore costs less at the same fee rate.
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Esta definición forma parte del glosario de Bitcoin Logical. Para la explicación completa, empieza por Aprender, o consulta las cifras en vivo en La Señal Bitcoin.