From: Luke Dashjr <luke@dashjr•org>
To: Johnson Lau <jl2012@xbt•hk>
Cc: bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] cleanstack alt stack & softfork improvements (Was: Merkle branch verification & tail-call semantics for generalized MAST)
Date: Thu, 21 Sep 2017 16:33:16 +0000 [thread overview]
Message-ID: <201709211633.17714.luke@dashjr.org> (raw)
In-Reply-To: <21D6060D-97F0-439A-86D3-065C21BACC3F@xbt.hk>
On Thursday 21 September 2017 8:02:42 AM Johnson Lau wrote:
> I think it’s possible only if you spend more witness space to store the
> (pubkey, message) pairs, so that old clients could understand the
> aggregation produced by new clients. But this completely defeats the
> purpose of doing aggregation.
SigAgg is a softfork, so old clients *won't* understand it... am I missing
something?
For example, perhaps the lookup opcode could have a data payload itself (eg,
like pushdata opcodes do), and the script can be parsed independently from
execution to collect the applicable ones.
> > This is another approach, and one that seems like a good idea in general.
> > I'm not sure it actually needs to take more witness space - in theory,
> > such stack items could be implied if the Script engine is designed for
> > it upfront. Then it would behave as if it were non-verify, while
> > retaining backward compatibility.
>
> Sounds interesting but I don’t get it. For example, how could you make a
> OP_MUL out of OP_NOP?
The same as your OP_MULVERIFY at the consensus level, except new clients would
execute it as an OP_MUL, and inject pops/pushes when sending such a
transaction to older clients. The hash committed to for the script would
include the inferred values, but not the actual on-chain data. This would
probably need to be part of some kind of MAST-like softfork to be viable, and
maybe not even then.
Luke
next prev parent reply other threads:[~2017-09-21 16:33 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 0:38 [bitcoin-dev] Merkle branch verification & tail-call semantics for generalized MAST Mark Friedenbach
2017-09-08 9:21 ` Johnson Lau
2017-09-12 2:03 ` Mark Friedenbach
2017-09-12 2:13 ` Bryan Bishop
2017-09-12 8:55 ` Johnson Lau
2017-09-12 19:57 ` Mark Friedenbach
2017-09-12 23:27 ` Karl Johan Alm
2017-09-13 9:41 ` Peter Todd
2017-09-11 20:37 ` Adán Sánchez de Pedro Crespo
2017-09-19 0:46 ` Mark Friedenbach
2017-09-19 3:09 ` [bitcoin-dev] cleanstack alt stack & softfork improvements (Was: Merkle branch verification & tail-call semantics for generalized MAST) Luke Dashjr
2017-09-19 7:33 ` Mark Friedenbach
2017-09-22 20:32 ` Sergio Demian Lerner
2017-09-22 21:11 ` Mark Friedenbach
2017-09-22 21:32 ` Sergio Demian Lerner
2017-09-22 21:39 ` Mark Friedenbach
2017-09-22 21:54 ` Sergio Demian Lerner
2017-09-22 22:07 ` Mark Friedenbach
2017-09-22 22:09 ` Pieter Wuille
2021-04-09 8:15 ` [bitcoin-dev] maximum block height on transaction Erik Aronesty
2021-04-09 11:39 ` Russell O'Connor
2021-04-09 15:54 ` Jeremy
2021-04-12 20:04 ` Billy Tetrud
2021-04-16 4:24 ` ZmnSCPxj
2021-05-03 2:30 ` ZmnSCPxj
2017-09-20 5:13 ` [bitcoin-dev] cleanstack alt stack & softfork improvements (Was: Merkle branch verification & tail-call semantics for generalized MAST) Johnson Lau
2017-09-20 19:29 ` Mark Friedenbach
2017-09-21 3:58 ` Johnson Lau
2017-09-21 4:11 ` Luke Dashjr
2017-09-21 8:02 ` Johnson Lau
2017-09-21 16:33 ` Luke Dashjr [this message]
2017-09-21 17:38 ` Johnson Lau
2017-09-30 23:23 ` [bitcoin-dev] Merkle branch verification & tail-call semantics for generalized MAST Luke Dashjr
2017-09-30 23:51 ` Mark Friedenbach
2017-10-02 17:15 ` Russell O'Connor
2017-10-28 4:40 ` Mark Friedenbach
2017-11-01 8:43 ` Luke Dashjr
2017-11-01 15:08 ` Mark Friedenbach
2017-11-04 7:59 ` Luke Dashjr
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