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Message-Id: <05590A33-1802-4C15-91C0-8777ACD8440B@voskuil.org>
From: Eric Voskuil <eric@voskuil.org>
Date: Mon, 2 Feb 2015 11:05:57 -0700
To: Brian Erdelyi <brian.erdelyi@gmail.com>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Proposal to address Bitcoin malware
Precedence: list

In sending the first-signed transaction to another for second signature, how=
 does the first signer authenticate to the second without compromising the  i=
ndependence of the two factors?

Sent from my iPhone

> On Feb 2, 2015, at 10:40 AM, Brian Erdelyi <brian.erdelyi@gmail.com> wrote=
:
>=20
> Another concept...
>=20
> It should be possible to use multisig wallets to protect against malware. =
 For example, a user could generate a wallet with 3 keys and require a trans=
action that has been signed by 2 of those keys.  One key is placed in cold s=
torage and anther sent to a third-party.
>=20
> It is now possible to generate and sign transactions on the users computer=
 and send this signed transaction to the third-party for the second signatur=
e.  This now permits the use of out of band transaction verification techniq=
ues before the third party signs the transaction and sends to the blockchain=
.
>=20
> If the third-party is malicious or becomes compromised they would not have=
 the ability to complete transactions as they only have one private key.  If=
 the third-party disappeared, the user could use the key in cold storage to s=
ign transactions and send funds to a new wallet.
>=20
> Thoughts?
> --------------------------------------------------------------------------=
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