From: Tim Ruffing <tim.ruffing@mmci•uni-saarland.de>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: Re: [bitcoin-dev] Taproot: Privacy preserving switchable scripting
Date: Wed, 24 Jan 2018 16:38:11 +0100 [thread overview]
Message-ID: <1516808291.4277.25.camel@mmci.uni-saarland.de> (raw)
In-Reply-To: <CAAt2M1-oh=_Ro6+Srit0XYburK_abQgJiW0Jx=nmNyeToA2rSA@mail.gmail.com>
On Wed, 2018-01-24 at 13:51 +0100, Natanael via bitcoin-dev wrote:
> Sidenote: There's a risk here with interception, insertion of a new
> commitment and getting the new transaction into the blockchain first.
> However, I would suggest a mining policy here were two known
> conflicting transactions with commitments are resolved such that the
> one with the oldest commitment wins. How to address detection of
> conflicting transactions with commitments older than confirmed
> transactions isn't obvious. Some of these may be fully intentional by
> the original owner, such as a regretted transaction.
Okay, I think my proposal was wrong...
This looks better (feel free to break again):
1. Commit (H(classic_pk, tx), tx) to the blockchain, wait until confirmed
2. Reveal classic_pk in the blockchain
Then the tx in the first valid commitment wins. If the attacker
intercepts classic_pk, it won't help him. He cannot create the first
valid commitment, because it is created already. (The reason is that
the decommitment is canonical now; for all commitments, the
decommitment is just classic_pk.)
By the way, maybe I'm stating the obvious but Taproot (or similar) is
indeed very nice for outputs generated in the future: You can have a
path for a classical signature scheme and a path for a quantum-secure
scheme.
Best,
Tim
next prev parent reply other threads:[~2018-01-24 15:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 0:30 Gregory Maxwell
2018-01-23 1:55 ` Chris Belcher
2018-01-23 2:51 ` Matt Corallo
2018-01-23 14:39 ` Mark Friedenbach
2018-01-23 21:23 ` Matt Corallo
2018-01-23 21:38 ` Gregory Maxwell
2018-01-23 6:44 ` Anthony Towns
2018-01-23 13:15 ` Gregory Maxwell
2018-01-23 22:22 ` Anthony Towns
2018-01-23 22:45 ` Gregory Maxwell
2018-01-24 1:52 ` Andrew Poelstra
2018-01-24 9:28 ` Tim Ruffing
2018-01-24 12:51 ` Natanael
2018-01-24 15:38 ` Tim Ruffing [this message]
2018-01-24 18:51 ` Natanael
2018-01-24 23:22 ` Tim Ruffing
2018-01-25 0:09 ` Natanael
2018-01-26 13:14 ` [bitcoin-dev] Recovery of old UTXOs in a post-quantum world Tim Ruffing
2018-01-27 17:07 ` [bitcoin-dev] Taproot: Privacy preserving switchable scripting Russell O'Connor
2018-01-27 17:23 ` Matt Corallo
2018-01-23 15:43 ` Greg Sanders
2018-01-26 21:34 ` Gregory Maxwell
2018-07-13 1:51 ` [bitcoin-dev] Generalised taproot Anthony Towns
2018-10-24 2:22 ` Pieter Wuille
2018-02-05 9:27 ` [bitcoin-dev] Taproot: Privacy preserving switchable scripting ZmnSCPxj
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