On Saturday, 29 March 2014, at 7:36 am, Gregory Maxwell wrote: > On Sat, Mar 29, 2014 at 7:28 AM, Watson Ladd <w...@uchicago.edu> wrote: > > This is not the case: one can use MPC techniques to compute a > > signature from shares without reconstructing the private key. There is > > a paper on this for bitcoin, but I don't know where it is. > > Practically speaking you cannot unless the technique used is one > carefully selected to make it possible. This proposal isn't such a > scheme I beleieve, however, and I think I'd strongly prefer that we > BIP standardize a formulation which also has this property.
I too would prefer that, but I do not believe there exists a method for computing a traditional signature from decomposed private key shares. Unless I'm mistaken, the composed signature has a different formula and requires a different verification algorithm from the ECDSA signatures we're using today. Thus, such a scheme would require a change to the Bitcoin scripting language. I specifically did not want to address that in my BIP because changes like that take too long. I am aiming to be useful in the present. ------------------------------------------------------------------------------ _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
