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BOLT 5 : data_loss let you salvage received HTLC on remote commitment #639
Thanks to data_loss_protect, your remote peer is going to give you his current per_commitment_point if channel_reestablish are exchanged. If he owns a fully-signed commitment_transaction and broadcast it, using your basepoints you should be able to derive keys even for remote_htlcpubkey and get back, non only your to_remote output, but also HTLC outputs.