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A rollup is a mechanism that allows transactions to be executed | A rollup is a mechanism that allows transactions to be executed outside layer 1 and then the data is posted to layer 1 where consensus is reached. As transaction data is included in layer 1 blocks, this allows rollups to be secured by native Ethereum security. | ||
Rollups achieve this goal by writing all transactions into L1 Ethereum as calldata, and then writing a hash of the transaction result (the state of their blockchain after the transaction). | |||
There are two types of rollups with different security models: | There are two types of rollups with different security models: | ||
# Optimistic rollups: assumes transactions are valid by default and only runs computation, via a fraud proof, in the event of a challenge. | # [[Optimistic rollups]]: assumes transactions are valid by default and only runs computation, via a [[fraud proof]], in the event of a challenge. | ||
# Zero Knowledge rollups rely on mathematical proofs, which are difficult (computationally intensive) to create, but relatively easy to verify. | # [[Zero Knowledge rollups]] rely on mathematical proofs, which are difficult (computationally intensive) to create, but relatively easy to verify. | ||
[[Category:Glossary]] | [[Category:Glossary]] | ||