On Sun, Dec 20, 2015 at 11:35 AM, Peter Todd wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > > > On 20 December 2015 08:30:45 GMT-08:00, Chris Pacia > wrote: > >On Dec 20, 2015 6:34 AM, "Jeff Garzik via bitcoin-dev" < > >bitcoin-dev@lists.linuxfoundation.org> wrote: > > > >> 2) This reverses the useful minimization attribute of HD wallets - > >"just > >backup the seed" > > > >It would be nice if the bip37 filter matching algorithm was extended to > >serve up the proof. > > > >And if server-based wallets did the same it would preserve the "just > >backup > >the seed" functionality. > > Exactly! The information will be out there - "just backup the seed" > requires someone to have the exact same data needed to generate the > TXO-unspent proof that my proposal requires to spend an old txout. > > tl;dr: jgarzik is incorrect; theres no difference at all from the status > quo. > The data stored in the legacy case makes it possible to sign and send a transaction without any connection to a network. The data stored in the upgraded case, absent grandfathering, requires significant network sync at a minimum. The user experience and security parameters are different. Thus, issue/recommendation #1.