On Dec 9, 2015, at 7:50 AM, Jorge Timón wrote: > I don't undesrtand. SPV nodes won't think they are validating transactions with the new version unless they adapt to the new format. They will be simply unable to receive payments using the new format if it is a softfork (although as said I agree with making it a hardfork on the simpler design and smaller fraud proofs grounds alone). > Okay, I might just not understand how a sigwit payment would look to current software yet. I'll add learning about that to my to-do list...