Crypto glossary
Plasma
Plasma is an early Ethereum scaling design in which child chains post only commitments to the main chain and users rely on exit games to withdraw safely.
Proposed in 2017, Plasma lets an operator run a child chain that processes transactions off Ethereum and periodically publishes a Merkle root of its blocks to a contract on mainnet. The transaction data itself stays with the operator. If the operator cheats, users can start an exit, proving ownership of their coins with the published roots, and anyone can challenge a fraudulent exit during a waiting period.
Plasma shaped the first wave of layer 2 projects, and early versions of networks that later became large, Polygon among them, offered Plasma bridges. Its exit games and fraud proofs were direct ancestors of optimistic rollups, which keep the challenge logic but publish all transaction data on the main chain.
The weak point is data availability. If the operator withholds blocks, users cannot build the proofs they need, and everyone may rush to exit at once, a scenario called mass exit. Plasma also handled general smart contracts poorly. It should not be confused with the stablecoin-focused blockchain launched in 2025 under the same name.
Example
On an early Plasma chain, a user who notices the operator has stopped publishing blocks submits an exit using their last valid transaction and waits out the challenge period to recover their tokens on Ethereum.
Related terms
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