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>
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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
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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 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
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