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37 lines
1.3 KiB
HTML
37 lines
1.3 KiB
HTML
---
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title: "Some Miners Generating Invalid Blocks"
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alias: "spv-mining"
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active: true
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banner: "WARNING: many wallets currently vulnerable to double spends (click here to read)"
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---
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<p><em>This document is being updated as new information arrives. Last
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update: 2015-07-04 06:00 UTC</em></p>
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<h2 id="summary">Summary</h2>
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<p>Some miners are currently generating invalid blocks. <b>Bitcoin Core
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0.9.4 and earlier</b> will accept these invalid blocks, making them
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more vulnerable to double spends. This <b>also applies to web wallets</b>
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from companies that still use 0.9.4 or earlier nodes.</p>
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<p><b>Lightweight (SPV) wallets are also at increased risk,</b> and will
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remain so until all miners have switched back to full
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validation.</p>
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<p>Users of the above listed vulnerable software must either <b>stop
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accepting transactions—even if they are confirmed—</b> or <a href="/en/download">upgrade to Bitcoin
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Core 0.10.2</a>.</p>
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<p>Users of Bitcoin Core 0.9.5 and later are currently unaffected.</p>
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<p><b>Miners:</b> If you are a pool miner, please switch immediately to a
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pool to that fully validates blocks.</p>
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<p><b>More information to follow.</b></p>
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<!--
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<div style="text-align:right">
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<i>This notice last updated: 2015-07-04 06:00 UTC</i>
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</div>
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-->
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