Comment by @harfang • Hey

Now we introduce a revocation key that prevents a cheater from broadcasting an expired tx. The revocation key allows the betrayed party to punish the cheat

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Now you understand better the basics of an Bidirectional payment channel. Soon a thread of how Lightning network implements this mechanism. This thread’s information comes from: https://github.com/bitcoinbook/bitcoinbook by aantonop and contributors. You can gather more information here: https://github.com/lnbook/lnbook same authors