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From: Jeff Garzik <jgarzik@bitpay.com>
Date: Wed, 12 Mar 2014 11:35:45 -0400
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Multisign payment protocol?
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On Wed, Mar 12, 2014 at 5:48 AM, Mike Hearn <mike@plan99.net> wrote:
> CoinVault is also using a partially signed transaction format whereby
> 0-length placeholders are used for missing signatures in the transaction
> scripts.
>
> I don't know how you are implementing this/what framework you're using, but
> I suggest using placeholders that are the length of an actual expected
> signature, at least when forming the transaction. This is what bitcoinj will
> do because otherwise you could end up miscalculating the fee, which is based
> on the final size. See TransactionSignature.dummy() in the API.
The zero-length placeholder is not a new invention.
This is what bitcoind produces and expects by default, for a partially
signed transaction.
--
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc. https://bitpay.com/
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