Bitcoin Mining Company Marathon Digital Mines Invalid Block

Marathon’s Bitcoin mining pool ordered a set of transactions in the wrong sequence, which resulted in making the whole block invalid.

Written By:
Gopal Solanky

Last updated: September 27, 2023 12:54 PM

Published September 27, 2023 12:54 PM

Last updated: September 27, 2023 12:54 PM

Published September 27, 2023 12:54 PM

A Nasdaq listed Bitcoin mining company, Marathon Digital, has mined an invalid Bitcoin block that has been rejected by other node operators.

According to BitMEX Research, Marathon Digital’s mining pool – MaraPool has transactions in the wrong order, which caused the block to be invalid.

It appears as if MARA had transactions in the wrong order.

The invalid block included this txn (A):https://t.co/IShJvlS8Ow

Spending an output from this txin (B):https://t.co/Z6BNJQqcYd

However, txin B was included in the block after txin A, therefore the block was invalid… https://t.co/rWC0mM8tyG
— BitMEX Research (@BitMEXResearch) September 27, 2023

It described that transaction (A) was to be executed based on the output from another transaction (B), which can only proceed if transaction (B) is set before transaction (A) in the block. However, MaraPool set both transactions in the wrong order, which resulted in the whole block being invalid.

The error was further confirmed by an anonymous Bitcoin developer, 0xB10C, adding that MaraPool might be running custom code instead of using Bitcoin Core, which double checks block validity after creating a block template.

It seems like MARAPool had a transaction ordering issue.

66dfefcdc3eeec2745c11f511f6068d62f34c34c767ba0feed47f63f01ccc2d8 is the 6th tx in the invalid block.

It spends from 7d18f0eefce0497b5d0c9b61fdf816b7744587c7e5e57acc53de71d1dae59725, which is the 1454th tx in the block. https://t.co/P3txhKqVS0
— b10c (@0xB10C) September 27, 2023

Bitcoin Core is an open-source software used by miners to operate a Bitcoin node

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