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Badumtss8

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I've no experience with crypto but a lot with UI. Is it possible that they were trying to send 500K for 1865 and entered the numbers in the wrong inputs ? Software asked them to confirm. They saw the correct digits and pressed ok.

Users have always paid upfront for software, until software companies with lots of capital started this non sense. All copies of Microsoft Office were paid upfront. Users are just reacting to what the software industry did.

nginx listens on port 80. Accessible from machine. Inaccessible from outside unless allowed by ufw.

docker listens on port X. Accessible on machine. Also accessible from outside regardless of ufw.

No amount of time and experience will make you think that configuring a software to listen on a port will automagically poke a hole in the firewall.