Plasma is the name given to the construction scalability method that places layer 2 blocks on top of the Ethereum blockchain in the form of a side chain. The implementation of Plasma gives the ability of hundreds of side chain transactions to be processed offline with only a single hash of the side chain block being added to the Ethereum blockchain. Fundamental flaws exist preventing further scalability. An exit game must be played for a user to withdraw from the side chain which requires side chain users to retain a high amount of data so that enough exists for validation. Also, a lengthy challenge period requires users to stay online or lose reward. Solutions that are more user friendly and less resource intensive are in development to improve layer 2 scalability. ZK-Rollups are one of the solutions in development to achieve this goal.
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