j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLùI set up several full nodes (around the world) and in the code where conflicting 'in-memory' transactions are detected I logged the transaction and had another machine that would consolidate the logs into one log to see global double spend attempts.
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https://whatsonchain.com/tx/7ab4c35a563c68da1a2b10e92c7f66e63e76af0bc273afb061eb23c12d8c7432