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 of measure for the weight of blocks and transactions. A vByte is equivalent to 4 weight units, and thus, a block is limited to being 1 vMegabyte large, or 4 million weight units.
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Block Weight
Block weight is a measure of the size of a block, measured in weight units. The Bitcoin protocol limits blocks to 4 million weight units, equivalent to a maximum of 4 megabytes.
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SegWit
Segregated Witness (SegWit) is a soft-fork upgrade to Bitcoin which was activated in 2017. SegWit fixed the problem of transaction malleability, and paved the way for the implementation of the Lightning Network and many other upgrades.
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Bitcoin Transaction Fee
All Bitcoin transactions must pay a fee to be included in the blockchain. The fee is paid to the miners. The higher the fee, the faster the transaction will be confirmed. Fees are measured based on the data size of the transaction.
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