<oembed><type>rich</type><version>1.0</version><author_name>npub18df3zgqr9zt5ah42zpd34rmq6fp7v57vvwmtk20krhrfdczp38ks5xccej</author_name><author_url>https://nostr.ae/npub18df3zgqr9zt5ah42zpd34rmq6fp7v57vvwmtk20krhrfdczp38ks5xccej</author_url><provider_name>njump</provider_name><provider_url>https://nostr.ae</provider_url><html>📅 Original date posted:2015-12-20&#xA;📝 Original message:On 12/19/15, jl2012 &lt;jl2012 at xbt.hk&gt; wrote:&#xA;&gt; Chris Priest via bitcoin-dev 於 2015-12-19 22:34 寫到:&#xA;&gt;&gt; Block witholding attacks are only possible if you have a majority of&#xA;&gt;&gt; hashpower. If you only have 20% hashpower, you can&#39;t do this attack.&#xA;&gt;&gt; Currently, this attack is only a theoretical attack, as the ones with&#xA;&gt;&gt; all the hashpower today are not engaging in this behavior. Even if&#xA;&gt;&gt; someone who had a lot of hashpower decided to pull off this attack,&#xA;&gt;&gt; they wouldn&#39;t be able to disrupt much. Once that time comes, then I&#xA;&gt;&gt; think this problem should be solved, until then it should be a low&#xA;&gt;&gt; priority. There are more important things to work on in the meantime.&#xA;&gt;&gt;&#xA;&gt;&#xA;&gt; This is not true. For a pool with 5% total hash rate, an attacker only&#xA;&gt; needs 0.5% of hash rate to sabotage 10% of their income. It&#39;s already&#xA;&gt; enough to kill the pool&#xA;&gt;&#xA;&gt;&#xA;&#xA;This begs the question: If this is such a devastating attack, then why&#xA;hasn&#39;t this attack brought down every pool in existence? As far as I&#39;m&#xA;aware, there are many pools in operation despite this possibility.</html></oembed>