Mainchain refers to the primary blockchain of a cryptocurrency network. It is the main ledger where all transactions are recorded and validated. The mainchain serves as the core that supports the entire ecosystem.Transactions processed on the mainchain typically have a higher level of security and decentralization. This is because they benefit from the consensus mechanisms applied to the wider network, ensuring that all activities are transparent and immutable.Some networks implement sidechains or layer-two solutions to enhance scalability or add specific features without overwhelming the mainchain. These sidechains may connect back to the mainchain, allowing assets to move between them while still relying on the mainchain for ultimate security and trust.In summary, the mainchain is essential for the functioning and integrity of a cryptocurrency network, acting as the backbone for all transactions and activities within that system.