Plasma

Plasma is a type of Layer 2 scaling approach that uses its own block validation mechanism and a network of bidirectional channels to track state changes. Plasma-based scaling systems differ from most rollup systems in that they do not store transaction data on the corresponding layer one blockchain so that the layer one nodes cannot verify the transaction on the Plasma layer. Generally, Plasma chains use fraud or fault proofs (like Optimistic Rollups) to arbitrate disputes. Since the advent of rollup scaling solutions, the utilization of Plasma type architectures has become less popular.