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From: "Jonathan Toomim (Toomim Bros)" <j@toom.im>
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Date: Wed, 7 Oct 2015 09:26:24 -0700
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To: Eric Lombrozo <elombrozo@gmail.com>
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Cc: "Jonathan Toomim \(Toomim Bros\) via bitcoin-dev"
<bitcoin-dev@lists.linuxfoundation.org>, Anthony Towns <aj@erisian.com.au>
Subject: Re: [bitcoin-dev] Let's deploy BIP65 CHECKLOCKTIMEVERIFY!
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On Oct 7, 2015, at 9:02 AM, Eric Lombrozo <elombrozo@gmail.com> wrote:
> But a real hashpower supermajority would make such attacks hard to =
pull off in practice.
If you had a 99% hashpower supermajority on the new version, an attacker =
would still be able to perform this attack once per day. Since the =
attacker is creating a transaction which is invalid according to new =
clients, it will just sit around in old clients' mempool until one of =
them mines a block.
--Apple-Mail=_633178B0-7663-4EDE-9A99-782901C7557E
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><div><br></div><br><div><div>On Oct 7, 2015, at 9:02 =
AM, Eric Lombrozo <<a =
href=3D"mailto:elombrozo@gmail.com">elombrozo@gmail.com</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: =
none; display: inline !important;">But a real hashpower supermajority =
would make such attacks hard to pull off in =
practice.</span></blockquote></div><br><div>If you had a 99% hashpower =
supermajority on the new version, an attacker would still be able to =
perform this attack once per day. Since the attacker is creating a =
transaction which is invalid according to new clients, it will just sit =
around in old clients' mempool until one of them mines a =
block. </div></body></html>=
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