Glossary

vSize

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The term vSize is equivalent to block weight.

See the full definition of block weight.

Related Terms
Weight unit
A weight unit is the unit used to measure the size of transactions and blocks as of the SegWit upgrade. Weight units are abbreviated as ‘wu’.
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vByte
A vByte is a unit measuring the weight of blocks and transactions. One vByte equals 4 weight units, so a block is limited to 4 million weight units.
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Block weight
Block weight measures a block's size in weight units. Bitcoin limits blocks to 4 million weight units, equal to a maximum of about 4 megabytes.
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SegWit
Segregated Witness (SegWit) is a 2017 soft-fork upgrade to Bitcoin that fixed transaction malleability and paved the way for the Lightning Network.
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Bitcoin transaction fee
Every Bitcoin transaction pays a fee to miners. Higher fees confirm faster, and fees are based on a transaction's data size rather than its bitcoin value.
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