Fiat cost processors often add a markup to the exchange charge they use when calculating a world fee. When this occurs, you likely won’t get the actual change charge. As an alternative, they take an additional slice of profit, and you end up with less in your pocket at the end of the transaction.

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In case of off-chain (Lightning) transaction issues happens in other method. Each lightning node has (may be many) on-chain address, from which one all begins. When funds are received on such address, utilizing cryptography techniques node could open so-known as lightning channel to another node, what signifies that these two nodes made settlement about funds availability between them. Later, all the transactions which are made trough channel (own transactions, or it could also be routed transaction from one other node) are saved only on these two nodes (and intermediate node if there was such). The only transactions which are saved in networks blockchain are channel opening and shutting transactions. Because of this Lightning transactions we call off-chain. Largely they exist solely in node database-file.