From: Pieter Wuille <bitcoin-dev@wuille•net>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Refreshed BIP324
Date: Sat, 12 Nov 2022 03:23:16 +0000 [thread overview]
Message-ID: <JXfTBjsA71dHE3h9wkxnWXANrwTbMADO4s2w34gEvMbiduKu4PEt5t-KA3EAIz-Xs4urjBHZ15NDFZST2a7e0x_NqyJymUnEORuTp3SNfMs=@wuille.net> (raw)
In-Reply-To: <wDqcIVw-YGTsjdf5M2GO9NNRl_UQuBeka2CUQUyQ329u6u-o7RabW_7S4FD3EDfk02kUczb3bXf8LtHhKLtx773UhQ7djKOl-JPOIrXqBSc=@wuille.net>
Another idea...
On Thursday, November 10th, 2022 at 4:23 PM, Pieter Wuille via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org> wrote:
> On Thursday, November 3rd, 2022 at 1:53 PM, Murch wrote:
>
> > From what I understand we'll have about 35 message types on the network
> > with the addition of BIP324. 256 possible IDs sounds like plenty room to
> > grow, but perhaps we can be a bit more conservative:
> >
> > We could use the first bit to signal a 2-byte message ID. That allows us
> > to express 128 IDs with 1 byte, but if we need more, we get a total of
> > 2^15 IDs across 2 bytes.
>
> Yeah, effectively treating the first 1 or 2 bytes as a simple variable
> length integer is a nice way of increasing the space at low cost.
The above would really result in having two separate variable-length encodings:
* First byte 1-12 to signify length of alphabetic command
* Otherwise first bit to signify length of short command
I think we can just merge the two and have a single variable-length command structure that can be used for both: command encodings are 1 to 12 bytes, each byte's top bit indicating whether another byte follows (the top bit of byte 11 has no special meaning).
This means:
* Every alphabetic command of L characters becomes L bytes.
* 102 non-alphabetic 1-byte commands can be assigned.
* 15708 non-alphabetic 2-byte commands can be assigned.
* etc
So this gives a uniform space which commands can be assigned from, and there is no strict need for thinking of the short-binary and long-alphabetic commands as distinct. In v2, some short ones would be treated as aliases for old long-alphabetic ones. But new commands could also just be introduced as short ones only (even in v1).
WDYT?
Cheers,
--
Pieter
next prev parent reply other threads:[~2022-11-12 3:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-08 12:59 Dhruv M
2022-10-26 16:39 ` Pieter Wuille
2022-10-27 7:28 ` Vasil Dimov
2022-11-03 17:53 ` Murch
2022-11-03 22:26 ` Jonas Schnelli
2022-11-08 3:20 ` Anthony Towns
2022-11-10 21:23 ` Pieter Wuille
2022-11-12 3:23 ` Pieter Wuille [this message]
2022-11-12 18:52 ` Yuval Kogman
2022-11-18 8:24 ` Anthony Towns
2023-01-05 22:06 ` Pieter Wuille
2023-01-05 23:12 ` Anthony Towns
2023-01-09 8:11 ` Anthony Towns
2023-02-16 17:43 ` Dhruv M
2023-02-17 15:51 ` Anthony Towns
2023-02-17 22:13 ` Pieter Wuille
2023-02-19 23:56 ` Anthony Towns
2023-02-20 15:22 ` Pieter Wuille
2023-02-21 16:03 ` Anthony Towns
2023-02-28 18:07 ` Dhruv M
2023-02-28 21:02 ` Erik Aronesty
2023-10-11 20:52 ` Tim Ruffing
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