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Bitcoin Lightning Network is a proposed solution to the blockchain congestion problem. Through the creation of an off-chain network that relies on payment channels, it could permit users to make transactions quickly and at a low cost. Transactions are only validated by nodes of the main blockchain, and not on the block chains. This allows for near-instantaneous settlement of payments while still maintaining transparency and security properties of the Bitcoin blockchain. Whether you have an interest a useful content about digital payments, check here.