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Alerts: SPV mining suggested changes

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David A. Harding 2015-07-04 05:23:32 -04:00
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_alerts/2015-07-04-spv-mining.html
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@ -7,14 +7,16 @@ banner: "WARNING: many wallets currently vulnerable to double-spending of confir
<p><em>This document is being updated as new information arrives. Last
update: 2015-07-04 09:00 UTC</em></p>
{% assign confs="15" %}
{% assign confs="30" %}
<h2 id="summary">Summary</h2>
<p>Your bitcoins are safe if you received them in transactions confirmed before 2015-07-04 08:00 UTC.</p>
<p>After that time, confirmation scores are not as reliable as they
usually are for users of certain software:</p>
<p>However, there has been a problem with a planned upgrade. For
bitcoins received later than the time above, confirmation scores are
significantly less reliable then they usually are for users of
certain software:</p>
<ul>
<li><b>Lightweight (SPV) wallet users</b> should wait an additional {{confs}}
@ -72,12 +74,9 @@ real.
consensus rules. <a href="/en/download">Upgrade</a> is recommended
to return to full node security.</li>
<li><b>Lightweight (SPV) wallets</b> are not safe until all the major
pools switch to full validation. After all the major pools fix
their problems, lightweight wallets will remain vulnerable to one,
two, or rarely three confirmation double spends until near 100% of
total hash rate has upgraded to a BIP66-compliant version of
Bitcoin Core.</li>
<li><b>Lightweight (SPV) wallets</b> are not safe for less than
{{confs}} confirmations until all the major pools switch to full
validation.</li>
<li><b>Web wallets</b> are very diverse in what infrastructure they
run and how they handle double spends, so unless you know for sure
@ -125,16 +124,6 @@ real.
current recommendation of waiting {{confs}} extra confirmations to a
lower number.</p>
<p>However, the BIP66 soft fork implementation method of waiting for
only 95% of miners to upgrade does leave miner-trusting software such
as lightweight wallets at increased risk of seeing invalid single
confirmations (10% risk), invalid double confirmations (1% risk), and
maybe even invalid triple confirmations (0.1% risk) until more of
the 5% non-upgraded miners do finally upgrade. So for the next
several weeks (maybe months), lightweight wallet users, web wallet
users, and users of old versions of Bitcoin Core should wait an extra
two to three confirmations.</p>
<!--
<div style="text-align:right">
<i>This notice last updated: 2015-07-04 06:00 UTC</i>