# vbytes

URL: https://blockspace.wiki/glossary/vbytes/

Virtual bytes: a transaction's weight divided by four, rounded up. Every non-witness byte costs 4 weight units and every witness byte 1, so a witness byte counts as a quarter of a vbyte. Fee markets price vbytes. BTI's canonical measure is raw serialized bytes with no weight discounting, and every book entry is kept in both bytes and vbytes.

Sources:

- block.space docs: data types · https://block.space/docs/datatypes
- block.space docs: BTI · https://block.space/docs/bti
- BIP 141: Segregated Witness (consensus layer) · https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki

Updated: 2026-10-20