# witness

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

The segwit section of a transaction (BIP 141/144) holding one stack per input. It is hashed into the wtxid but not the txid, and each of its bytes weighs 1 WU instead of 4.

Sources:

- block.space docs: data types · https://block.space/docs/datatypes

Updated: 2026-10-20