https://en.wikipedia.org/wiki/Two_Generals'_Problem https://en.wikipedia.org/wiki/Two_Generals'_Problem "Because acknowledgement of message receipt can be lost

https://en.wikipedia.org/wiki/Two_Generals'_Problem https://en.wikipedia.org/wiki/Two_Generals'_Problem "Because acknowledgement of message receipt can be lost as easily as the original message, a potentially infinite series of messages are required to come to consensus." What you want isn't really a handshake, it's a commit, and no finite amount of messages will ensure agreement over a lossy network.