[Bitcoin-development] Regtest Consensus Forking Behavior Introduced in Bitcoin Core in May 2014

[Dave Collins]

Hello All,

Josh Rickmar and I discovered a subtle consensus change in Bitcoin Core
which causes forking behavior on regtest.  Luckily it does not affect
mainnet or testnet, however it does mean that regtest difficulty
retargetting is broken.

I've made a post to the bitcointalk forums at
https://bitcointalk.org/index.php?topic=1065504 for the nicer formatting
which explains in detail.

Regards,

Dave Collins



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Re: [Bitcoin-development] [softfork proposal] Strict DER signatures

[Dave Collins]

I'm really glad to see this proposal.  We already treat non-DER
signatures as non-standard in btcd and agree that extending them be
illegal as a part of a soft fork is a smart and sane thing to do.

It's also good to see the explicit use of signature parsing since it
matches what we already do as well because we noticed noticed OpenSSL's
notion of big numbers (unsigned) didn't agree with Go's (signed).  By
having the explicit signature scheme and checking clearly called out in
a BIP, it greatly lowers the chances of there being any disagreement
about what is valid or invalid due to an underlying dependency.

+1

On 1/20/2015 6:35 PM, Pieter Wuille wrote:
 Hello everyone,
 
 We've been aware of the risk of depending on OpenSSL for consensus
 rules for a while, and were trying to get rid of this as part of BIP
 62 (malleability protection), which was however postponed due to
 unforeseen complexities. The recent evens (see the thread titled
 OpenSSL 1.0.0p / 1.0.1k incompatible, causes blockchain rejection.
 on this mailing list) have made it clear that the problem is very
 real, however, and I would prefer to have a fundamental solution for
 it sooner rather than later.
 
 I therefore propose a softfork to make non-DER signatures illegal
 (they've been non-standard since v0.8.0). A draft BIP text can be
 found on:
 
 https://gist.github.com/sipa/5d12c343746dad376c80
 
 The document includes motivation and specification. In addition, an
 implementation (including unit tests derived from the BIP text) can be
 found on:
 
 https://github.com/sipa/bitcoin/commit/bipstrictder
 
 Comments/criticisms are very welcome, but I'd prefer keeping the
 discussion here on the mailinglist (which is more accessible than on
 the gist).
 



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