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Alerts: first version of invalid v3 blocks

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David A. Harding 2015-07-04 02:06:20 -04:00
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---
title: "Some Miners Generating Invalid v3 Blocks"
alias: "spv-mining"
active: true
banner: "WARNING: many wallets currently vulnerable to double spends (click here to read)"
---
<p><em>This document is being updated as new information arrives. Last
update: 2015-07-04 06:00 UTC</em></p>
<h2 id="summary">Summary</h2>
<p>Some miners are currently generating invalid blocks. <b>Bitcoin Core
0.9.x and earlier</b> will accept these invalid blocks, making them
more vulnerable to double spends. This <b>also applies to web wallets</b>
from companies that still use 0.9.x or earlier nodes.</p>
<p><b>Lightweight (SPV) wallets are also at increased risk,</b> and will
remain so until all miners have switched back to full
validation.</p>
<p>Users of the above listed vulnerable software must either <b>stop
accepting transactions</b> or <a href="/en/download">upgrade to Bitcoin
Core 0.10.0 or later</a>.</p>
<p>Users of Bitcoin Core 0.10.0 and later are currently unaffected.</p>
<p><b>Miners:</b> If you are a pool miner, please switch immediately to a
pool to that fully validates blocks.</p>
<p><b>More information to follow.</b></p>
<!--
<div style="text-align:right">
<i>This notice last updated: 2015-07-04 06:00 UTC</i>
</div>
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