Scalability
Sidechains enable a high degree of versatility and scalability. A blockchain can spin up a series of sidechains and 'delegate' processing work to them to increase throughput, for example. Think of this as a manager delegating tasks to other staff so that more work can be done simultaneously.
Sidechains do have one drawback: in most cases, they're not operated by the same nodes or network as the mainchain, which means that sidechain nodes will need to trust the sidechain's security model. The EVM sidechain however will implement a sidechain that will inherit Cardanoβs security model
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