Marathon ($MARA) mined an “invalid block” the other day. They claim to accidentally have organized transactions in block 809478 incorrectly due to R&D to improve efficiency of their pool. Since the mined block didn’t follow protocol rules Nodes rejected the block which showcases the robustness of the bitcoin protocol. Miners don’t have the power to change the rules and network nodes stopped an invalid block from being accepted.

David vs Goliath, A tale as old as time 👾💪