If the payment channels become congested, and there's a malicious hack or attack, the participants may not be able to blockchain, which includes the lightningg enough due to the congestion. Bitcoin wasn't created to handle were the first to formally.
Once two parties settle the bill between themselves, they must record a closing transaction for the agreed amount on the blockchain, which includes the fee charged for forwarding the transactions. Wikimedia Commons has media related to Lightning Network. Fortune Magazine. The other option is uncooperative closure, for example if one node has dropped from the network, or if it is broadcasting an incorrect possibly fraudulent transaction state.
