The fact that this is possible should be enough for us to implement meassures against it.

On Fri, 7 Apr 2017, Daniele Pinna via bitcoin-dev wrote:

Can you please not forget to supply us more details on the claims made 
regarding the reverse engineering of the Asic chip?

It is absolutely crucial that we get these independently verified ASAP.


      Message: 2
      Date: Thu, 6 Apr 2017 21:38:31 +0000
      From: Gregory Maxwell <>
      To: Bitcoin Dev <>
      Subject: Re: [bitcoin-dev] BIP proposal: Inhibiting a covert attack on
              the     Bitcoin POW function
      Content-Type: text/plain; charset=UTF-8
      On Wed, Apr 5, 2017 at 9:37 PM, Gregory Maxwell <> wrote:
      > each block MUST either contain a BIP-141 segwit commitment or a
      > correct WTXID commitment with ID 0xaa21a9ef.
      It was just pointed out to me that the proposed ID (which I just
      selected to be above the segwit one) collides with one chosen in
      another non-BIP proposal.  This wasn't intentional, and I'll happily
      change the value when I update the document.


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