From: =?utf-8?Q?JOSE_FEMENIAS_CA=C3=91UELO?= <jose.femenias@gmail.com>
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Message-Id: <90096274-9576-4A08-A86A-E1C4F3E3B5DE@gmail.com>
Date: Sun, 11 Mar 2018 13:44:47 +0100
To: bitcoin-dev@lists.linuxfoundation.org
Subject: [bitcoin-dev] Bulletproof CT as basis for election voting?
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If I understand Bulletproof Confidential Transactions properly, their =
main virtue is being able to hide not the senders/receivers of a coin =
but the amount transferred.
That sounds to me like a perfect use case for an election.
For instance, in my country, every citizen is issued a National ID Card =
with a digital certificate.=20
So, a naive implementation could simply be that the Voting Authority, =
sends a coin (1 coin =3D 1 vote) to each citizen above 18. This would be =
an open transaction, so it is easily auditable.
Later on, each voter sends her coin to her preferred party, as part of a =
Bulletproof CT, along with 0 coins to other parties to disguise her =
vote.
In the end, each party will accrue as may votes as coins received.

Is there any gotcha I=E2=80=99m missing here? Are there any missing =
features required in Bulletproof to support this use case?=