On Wed, Mar 12, 2014 at 05:14:25PM +0100, Mike Hearn wrote: > > > > Can this be calculated in advance knowing the initial transaction size and > > the number of signatures required? > > > > Sure of course. You assume each signature to be placed in the tx is 73 > bytes. Not very hard, but if the tx you get back from the API doesn't > contain such a 73-byte sentinel value then it's harder to be sure that this > part was done correctly.
Multisig signing is an example of untrusted input from an adversary; this is a good example where you'd be better off just handling it correctly rather than trying to "make it easier". (although handling it correctly may include internally converting every not-yet-signed dummy signature into a 73 bytes pushdata prior to calculating the size) -- 'peter'[:-1]@petertodd.org 0000000000000000e18643801741dc70db6fda175230012b0f697024218cd9ef
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