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<p class="is-style-lead">Marathon Digital Holdings (MARA), a publicly traded crypto mining company, reportedly mined an invalid block on Bitcoin, according to developers, miners and researchers</p> 
<p>The invalid block was at height 809478, with anonymous Bitcoin developer “0xB10C” writing on oo<a href="https://twitter.com/0xB10C/status/1706969844350963801" target="_blank" rel="noopener noreferrer nofollow">X</a> that MaraPool — Marathon’s mining pool — had a “transaction ordering issue.” </p> 
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   <p lang="en" dir="ltr">It seems like MARAPool had a transaction ordering issue. <br><br>66dfefcdc3eeec2745c11f511f6068d62f34c34c767ba0feed47f63f01ccc2d8 is the 6th tx in the invalid block.<br><br>It spends from 7d18f0eefce0497b5d0c9b61fdf816b7744587c7e5e57acc53de71d1dae59725, which is the 1454th tx in the block. <a href="https://t.co/P3txhKqVS0" target="_blank" rel="noopener noreferrer nofollow">https://t.co/P3txhKqVS0</a></p>— 0xB10C (@0xB10C) <a href="https://twitter.com/0xB10C/status/1706969844350963801?ref_src=twsrc%5Etfw" target="_blank" rel="noopener noreferrer nofollow">September 27, 2023</a> 
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<p>This was <a href="https://twitter.com/lopp/status/1706940328056357194" target="_blank" rel="noopener noreferrer nofollow">confirmed</a> by Casa CTO Jameson Lopp, who said that data gathered from all nine of his nodes shows that the block contained a transaction that incorrectly spent an output before it was created, thus invalidating the block.</p> 
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   <p lang="en" dir="ltr">Confirmed on my nodes. <a href="https://t.co/NIrNMGHnwa" target="_blank" rel="noopener noreferrer nofollow">https://t.co/NIrNMGHnwa</a></p>— Jameson Lopp (@lopp) <a href="https://twitter.com/lopp/status/1706940328056357194?ref_src=twsrc%5Etfw" target="_blank" rel="noopener noreferrer nofollow">September 27, 2023</a> 
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<p> You might also like: <a href="https://crypto.news/marathons-bitcoin-production-slips-9-amid-unprecedented-heatwave/" rel="noopener noreferrer nofollow"> Marathon’s Bitcoin production slips 9% amid ‘unprecedented’ heatwave </a> </p> 
<p>Other Bitcoin node operators rejected the invalid block. </p> 
<p>According to BitMEX Research, the issue arose because a transaction in the block was ordered incorrectly in relation to a spending output transaction, breaking consensus rules.</p> 
<p>When a miner produces an invalid block, nodes running the Bitcoin protocol will reject and not build on top of it. Miners are incentivized to construct valid blocks according to consensus rules, as invalid blocks represent wasted resources and reward loss.</p> 
<p>Marathon Digital operates a large mining operation with over 37,000 active miners and 3.2 EH/s of hash rate. However, this incident illustrates that even major mining pools are susceptible to consensus rule violations that lead to wasted mining effort.</p> 
<p>The event appears to be a minor hiccup that demonstrates the resilience of Bitcoin’s decentralized proof-of-work consensus mechanism. </p> 
<p>Even major miners must follow network rules and properly structure blocks, or their work will be rejected by the peer-to-peer network.</p> 
<p> Read more: <a href="https://crypto.news/marathon-registers-record-bitcoin-production-in-q1-2023/" rel="noopener noreferrer nofollow"> Marathon registers record bitcoin production in Q1 2023 </a> </p>

Marathon reportedly mined an invalid Bitcoin block

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