/// child anchor transaction. To sign its anchor input, an [`InMemorySigner`] should be
/// re-derived through [`KeysManager::derive_channel_keys`] with the help of
/// [`AnchorDescriptor::channel_keys_id`] and [`AnchorDescriptor::channel_value_satoshis`]. The
/// child anchor transaction. To sign its anchor input, an [`InMemorySigner`] should be
/// re-derived through [`KeysManager::derive_channel_keys`] with the help of
/// [`AnchorDescriptor::channel_keys_id`] and [`AnchorDescriptor::channel_value_satoshis`]. The