MARA Pool, the Bitcoin mining pool operated by the publicly listed Marathon Digital Holdings, had a transaction ordering issue on September 27 after it mined an invalid block at block height 809478. The invalid block was first picked by an X user, “0xB10C”, before Jameson Lopp, the CTO of Casa, a Bitcoin-focused company, later confirmed it.
Lopp scanned his node and noted that MARA Pool had spent an output before it was created, validating a double-spent transaction.
Marathon Digital Mined An Invalid Block
In Bitcoin, a mining pool or an individual miner can’t approve an “illegal” transaction originating from any network user. By double-spending, the user posting the transaction tries to cheat the system.
Bitcoin is self-auditing, and every miner and mining pool connected to the network must always confirm that all transactions in the latest block and attached to the longest chain are valid. If a block contains an invalid transaction not supported by other miners, it w
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