pub(crate) const RECOVER_NUM_IDX_ADD_TO_LAST_USED: u64 = 8;Expand description
New client will start deriving new addresses from last used one
plus that many indexes. This should be less than
MAX_GAP, but more than 0: We want to make sure we detect
deposits that might have been made after multiple successive recoveries,
but we want also to avoid accidental address re-use.