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From: "Russell O'Connor" <roconnor@blockstream.io>
Date: Mon, 22 May 2017 18:32:38 -0400
Message-ID: <CAMZUoKk1fxOLgBfuxqXpxG-M5ZCPHZBb62_LZF7H4syQ-L7tCg@mail.gmail.com>
To: Peter Todd <pete@petertodd.org>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] A Method for Computing Merkle Roots of Annotated
Binary Trees
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On May 22, 2017 23:05, "Peter Todd" <pete@petertodd.org> wrote:
On Mon, May 22, 2017 at 03:05:49AM -0400, Russell O'Connor via bitcoin-dev
wrote:
> MerkleRoot :=3D SHA256(SHA256(LeftRoot =E2=8B=85 RightRoot))
> sha256Compress : Word256 =C3=97 Word512 -> Word256
To be clear, what math operations do you mean by "=E2=8B=85" and "=C3=97"?
By "=E2=8B=85", I usually mean concatenation (though I also use it for func=
tion
composition in one instance). By "=C3=97", I mean the Cartesian product.
--001a114c1e92d1ec000550247204
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"auto"><div><br><div class=3D"gmail_extra"><br><div class=3D"gma=
il_quote">On May 22, 2017 23:05, "Peter Todd" <<a href=3D"mail=
to:pete@petertodd.org">pete@petertodd.org</a>> wrote:<br type=3D"attribu=
tion"><blockquote class=3D"quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">On Mon, May 22, 2017 at 03:05:49AM -0400, Ru=
ssell O'Connor via bitcoin-dev wrote:<br>
>=C2=A0 =C2=A0 =C2=A0MerkleRoot :=3D SHA256(SHA256(LeftRoot =E2=8B=85 Ri=
ghtRoot))<br>
<div class=3D"quoted-text">>=C2=A0 =C2=A0 =C2=A0sha256Compress : Word256=
=C3=97 Word512 -> Word256<br>
<br>
</div>To be clear, what math operations do you mean by "=E2=8B=85"=
; and "=C3=97"?</blockquote></div></div></div><div dir=3D"auto"><=
br></div><div dir=3D"auto">By=C2=A0<span style=3D"font-family:sans-serif">&=
quot;=E2=8B=85", I usually mean concatenation (though I also use it fo=
r function composition in one instance). =C2=A0 By=C2=A0</span><span style=
=3D"font-family:sans-serif">"=C3=97", I mean the Cartesian produc=
t.</span></div><div dir=3D"auto"></div><div dir=3D"auto"></div><div dir=3D"=
auto"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blockquote cla=
ss=3D"quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex"><font color=3D"#888888">
</font></blockquote></div><br></div></div></div>
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