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From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
To: Rusty Russell <rusty@rustcorp.com.au>,
	Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Making OP_TRUE standard?
Date: Thu, 17 May 2018 06:28:54 -0400	[thread overview]
Message-ID: <bGnScyqXi6LMbsqtc8l3DDTfibYhKd30y-Urd28iImu-gK2hBKYPLpkkbit18RkYlmakzoJAVqKyqL5bw_By_AdXJJd1r3QrLjH1W6igKPM=@protonmail.com> (raw)
In-Reply-To: <87vabnq9ui.fsf@rustcorp.com.au>

Good morning Rusty and list,

> Your zero-val-OP_TRUE-can't-be-spent-after-same-block SF is interesting,
> 
> but if we want a SF just give us SIGHASH_NOINPUT and we'll not need this
> 
> at all (though others still might).

We might still want this in general in Lightning; for instance we could make every funding transaction include such an output.  If it turns out, our initial feerate estimate for the funding transaction is low, we can use the `OP_TRUE` for fee-bumping.  This is a win for Lightning since the funding transaction ID remains the same (even in Decker-Russell-Osuntokun, the trigger transaction is signed with `SIGHASH_ALL`, and refers to a fixed funding transaction ID).

Without the `OP_TRUE`-for-fee-bump, we would have to pretend to open a new different channel and RBF the old funding transaction with a new higher-feerate funding transaction, then keep track of which one gets confirmed deeply (there is a race where a miner discovers a block using the older funding transaction before our broadcast of the new funding transaction reaches it).

(we could also feebump using the change output of the funding transaction, but such a change output might not exist for all funding transactions.)

Regards,
ZmnSCPxj


  reply	other threads:[~2018-05-17 10:29 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08 23:57 [bitcoin-dev] Making OP_TRUE standard? Rusty Russell
2018-05-09  0:24 ` Olaoluwa Osuntokun
2018-05-09  3:02   ` ZmnSCPxj
2018-05-10  2:08   ` Rusty Russell
2018-05-09 17:56 ` Johnson Lau
2018-05-09 19:27   ` Peter Todd
2018-05-09 20:19     ` Johnson Lau
2018-05-09 20:59       ` Peter Todd
2018-05-09 22:06   ` Olaoluwa Osuntokun
2018-05-10  2:06   ` Rusty Russell
2018-05-10  2:27 ` Luke Dashjr
2018-05-10  3:07   ` ZmnSCPxj
2018-05-15  1:22   ` ZmnSCPxj
2018-05-17  2:44   ` Rusty Russell
2018-05-17 10:28     ` ZmnSCPxj [this message]
2018-05-17 17:35       ` Christian Decker
2018-05-17 20:06     ` Jim Posen
2018-05-21  3:44       ` Rusty Russell
2018-05-21  3:56         ` Peter Todd
2018-05-30  2:47           ` Rusty Russell
2018-05-31  2:47             ` Rusty Russell
2018-05-21 14:20         ` Russell O'Connor
2018-05-10  9:33 ` Jorge Timón
2018-05-10  9:33   ` Jorge Timón
2018-05-10  9:43   ` Luke Dashjr
2018-05-11  2:44     ` ZmnSCPxj

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