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Recently, while discussing the merits of Lightning, the question of securing all the unsigned Lightning transactions arose.
As it should be possible to have a SPV Lightning client running on any device (e.g. a mobile phone), how would one recover all these IOUs if the phone was lost or stolen?
With Bitcoin and HD wallets, as everything is stored on the blockchain, no backup is needed, as long one has the recovery seed. Is there something similar for lightning wallets?