From: Peter Todd <pete@petertodd.org>
To: Sean Bowe <sean@z.cash>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP draft: HTLC transactions
Date: Wed, 20 Jul 2016 01:46:54 -0400 [thread overview]
Message-ID: <20160720054654.GA1420@fedora-21-dvm> (raw)
In-Reply-To: <CAKazn3mKUMMz0wyqTsgbkd4mBLgvG2PXziXhgRTi4hX_ApbPhg@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 837 bytes --]
On Tue, Jul 19, 2016 at 10:35:39PM -0600, Sean Bowe via bitcoin-dev wrote:
> I'm requesting feedback for Hash Time-Locked Contract (HTLC) transactions
> in Bitcoin.
>
> HTLC transactions allow you to pay for the preimage of a hash. CSV/CLTV can
> be used to recover your funds if the other party is not cooperative. These
> scripts take the following general form:
>
> [HASHOP] <digest> OP_EQUAL
> OP_IF
> <seller pubkey>
> OP_ELSE
> <num> [TIMEOUTOP] OP_DROP <buyer pubkey>
> OP_ENDIF
> OP_CHECKSIG
Note that because you're hashing the top item on the stack regardless
scriptSig's that satisfy HTLC's are malleable: that top stack item can be
changed anything in the digest-not-provided case and the script still passes.
--
https://petertodd.org 'peter'[:-1]@petertodd.org
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 455 bytes --]
next prev parent reply other threads:[~2016-07-20 5:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 4:35 [bitcoin-dev] BIP draft: HTLC transactions Sean Bowe
2016-07-20 5:46 ` Peter Todd [this message]
2016-07-20 6:17 ` Luke Dashjr
2016-08-09 0:46 ` Peter Todd
2016-08-17 10:00 ` Johnson Lau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160720054654.GA1420@fedora-21-dvm \
--to=pete@petertodd.org \
--cc=bitcoin-dev@lists.linuxfoundation.org \
--cc=sean@z.cash \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox