Imagine that the Ethereum mainnet is a crowded core business district, where every transaction has to queue for confirmation. Plasma is like a specialty branch built next to it—it's not a simple copy, but a clever ‘separation technique.’ After users deposit their assets into the mainnet vault, they can trade at lightning speed in the branch, ultimately only sending back a summary of the results to the main street. The brilliance of this design lies in the fact that the branch keeps its own accounts, but can always use the mainnet asset certificate as a ‘golden sword’ for protection.
Although transferring between branches is slightly troublesome in practice, and the exit mechanism requires a seven-day cooling-off period, Plasma truly opens up a new conceptual space for on-chain sharding. It uses cryptographic commitments to anchor security on the main chain, like equipping the blockchain with a detachable expansion cabin—enjoying the security of the mainnet while gaining the freedom of the side chains.
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