[bitcoin-dev] BIP 158 Flexibility and Filter Size

[Gregory Maxwell]

On Tue, May 29, 2018 at 2:42 AM, Jim Posen <jim.posen at gmail.com> wrote:
> Certain wallets may be able to use only the output script filter by using
> output scripts to watch for confirmations on sent transactions, assuming
> that application is the only one with access to the private keys. The
> additional benefit of the input script/outpoint filter is to watch for
> unexpected spends (coins getting stolen or spent from another wallet) or
> transactions without a unique change or output address. I think this is a
> reasonable implementation, and it would be nice to be able to download that
> filter without any input elements.

In this configuration there is little need to access historical blocks
though, since you're assuming that you'll never recover from a backup.
No?