public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Johnson Lau <jl2012@xbt.hk>
To: bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: [bitcoin-dev] BIP draft: Scripting System in Merkelized Abstract Syntax Tree
Date: Fri, 29 Apr 2016 07:48:10 +0200	[thread overview]
Message-ID: <D35A2482-CC78-4423-BD7B-EA3EEE1AC732@xbt.hk> (raw)

[-- Attachment #1: Type: text/plain, Size: 1365 bytes --]

https://github.com/jl2012/bips/blob/mastopcodes/bip-mastopcodes.mediawiki

This BIP defines the scripting system in Merkelized Abstract Syntax Tree (BIP114). It re-enables some of the previously disabled opcodes, introduces new opcodes, and defines expandable opcodes for future extension.

It will:
	• re-enable CAT, SUBSTR, LEFT, RIGHT, INVERT, AND, OR, XOR, LSHIFT, and RSHIFT;
	• introduce new opcodes: DUPTOALTSTACK, DUPFROMALTSTACK, SWAPSTACK, SWAPCAT, and RESIZE;
	• define expandable opcodes for future softforks of stack manipulating opcodes: EXPAND1 to EXPAND32.


This BIP is based on the BIP114 MAST: https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki

Reference implementation, including the BIP9 logic and script tests, could be found at https://github.com/jl2012/bitcoin/tree/segwit_mast . This branch is rebased on top of the #7910 segwit PR. However, I have not tested the BIP9 activation.

The implementation of the re-enabled opcode are mostly taken from the Elements Project.

-------------

This BIP does not describe changes in CHECKSIG (e.g. new hash type, Schnorr sig), which I think should be another BIP.

I have also considered more radical changes. For example, make all comparison opcode to be “VERIFY” type, and a script passes if and only if the stack is exactly empty after evaluation.



[-- Attachment #2: Message signed with OpenPGP using GPGMail --]
[-- Type: application/pgp-signature, Size: 671 bytes --]

                 reply	other threads:[~2016-04-29  5:48 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=D35A2482-CC78-4423-BD7B-EA3EEE1AC732@xbt.hk \
    --to=jl2012@xbt.hk \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox