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🤓Sidechain is a separate blockchain with a two-way binding to the parent blockchain (the main chain). It allows tokens and other digital assets of one blockchain to be used securely in another blockchain and then (if necessary) be returned to the original blockchain. The user of the parent blockchain must first send the coins to the outgoing address, where they are" locked " by the participants of the so-called "federation", which is designed to exclude the possibility of spending them elsewhere. When the transaction is completed, its participants receive a confirmation, but for additional security, this happens after a certain waiting period. After that, the equivalent amount of coins is transferred to the sidechain, and the user has the opportunity to spend them. When sending coins from the sidechain to the main blockchain, the reverse process occurs.

The most well – known platform that uses sidechains is Polygn (Matic previously). It uses sidechains for off-chain computing, which allows developers to create and maintain various dapps.

In addition to their own developments, Polygon implements support for Optimistic Rollups, ZK-Rollups, and Validium. Rollups reduce the load on the network by grouping transactions and moving some of the calculations outside of Ethereum — into sidechains. There are two main types of Rollups: ZK-Rollups and Optimistic rollups.

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