From: Christian Decker <decker.christian@gmail•com>
To: Jeff Garzik <jgarzik@bitpay•com>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] deterministic transaction expiration
Date: Wed, 6 Aug 2014 16:17:02 +0100 [thread overview]
Message-ID: <CALxbBHXh-Fktsr96PMXdohJdgcUKoNreJ-ZuApKOX3-qSkdk2w@mail.gmail.com> (raw)
In-Reply-To: <CAJHLa0OtPA3DGQuJhp3zkK5dnBux6TFAw3qDsBdO0zaxrqBgRg@mail.gmail.com>
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+1 for the new field, overloading fields with new meaning is definitely not
a good idea.
Something like nExpireAt with a block height sounds reasonable to me, but
we need to document that the usual caveats with blockchain reorgs apply.
On Wed, Aug 6, 2014 at 4:08 PM, Jeff Garzik <jgarzik@bitpay•com> wrote:
> ...because nLockTime is the exact opposite of expiration. A locked TX
> begins life invalid, and becomes valid (not-expired) after nLockTime passes.
>
> A new field containing expiration time would work.
>
>
>
> On Wed, Aug 6, 2014 at 10:44 AM, Tom Harding <tomh@thinlink•com> wrote:
>
>>
>> How is eventual expiration of a tx that started life with an nLockTime in
>> the future "breaking", any more than any other tx expiring?
>>
>>
>>
>> On 8/6/2014 6:54 AM, Mike Hearn wrote:
>>
>> We could however introduce a new field in a new tx version. We know we
>> need to rev the format at some point anyway.
>>
>>
>> On Wed, Aug 6, 2014 at 2:55 PM, Jeff Garzik <jgarzik@bitpay•com> wrote:
>>
>>> ...and existing users and uses of nLockTime suddenly become worthless,
>>> breaking payment channel refunds and other active uses of nLockTime.
>>>
>>> You cannot assume the user is around to rewrite their nLockTime, if it
>>> fails to be confirmed before some arbitrary deadline being set.
>>>
>>>
>>>
>>> On Wed, Aug 6, 2014 at 12:01 AM, Tom Harding <tomh@thinlink•com> wrote:
>>>
>>>> ...
>>>>
>>>
>> If nLockTime is used for expiration, transaction creator can't lie
>>>> to
>>>> help tx live longer without pushing initial confirmation eligibility
>>>> into the future. Very pretty. It would also enable "fill or kill"
>>>> transactions with a backdated nLockTime, which must be confirmed in a
>>>> few blocks, or start vanishing from mempools.
>>>>
>>>
>>
>
>
> --
> Jeff Garzik
> Bitcoin core developer and open source evangelist
> BitPay, Inc. https://bitpay.com/
>
>
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next prev parent reply other threads:[~2014-08-06 15:17 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-01 0:58 Kaz Wesley
2014-08-01 1:06 ` Peter Todd
2014-08-01 1:37 ` Kaz Wesley
2014-08-01 1:38 ` Matt Whitlock
2014-08-01 2:28 ` Gregory Maxwell
2014-08-01 3:26 ` Matt Whitlock
2014-08-01 3:31 ` Gregory Maxwell
2014-08-05 18:01 ` Alex Mizrahi
2014-08-02 0:36 ` Tom Harding
2014-08-05 17:02 ` Flavien Charlon
2014-08-05 17:48 ` Jeff Garzik
2014-08-05 18:54 ` Mike Hearn
2014-08-05 19:08 ` Jeff Garzik
2014-08-05 19:10 ` Kaz Wesley
2014-08-05 19:36 ` Jeff Garzik
2014-08-06 4:01 ` Tom Harding
2014-08-06 12:55 ` Jeff Garzik
2014-08-06 13:54 ` Mike Hearn
2014-08-06 14:44 ` Tom Harding
2014-08-06 15:08 ` Jeff Garzik
2014-08-06 15:17 ` Christian Decker [this message]
2014-08-06 15:42 ` Peter Todd
2014-08-06 16:15 ` Jeff Garzik
2014-08-06 17:02 ` Tom Harding
2014-08-06 17:21 ` Mark Friedenbach
2014-08-06 17:34 ` Peter Todd
2014-08-06 17:24 ` Jeff Garzik
2014-08-06 16:31 ` Mark Friedenbach
2014-08-06 17:20 ` Peter Todd
2014-08-06 17:30 ` Mark Friedenbach
2014-08-06 17:38 ` Peter Todd
2014-08-08 17:38 ` Tom Harding
2014-08-08 18:13 ` Jeff Garzik
2014-08-08 18:42 ` Kaz Wesley
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