This is probably the best diagram explaining HTLCs I found https://ellemouton.com/posts/htlc-deep-dive/#all-together-now
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Very nice diagram.
Can be improved further with to_local_anchor and to_remote_anchor outputs for anchor channels!
Good stuff. Saw her give a talk in London at Advancing Bitcoin and was very impressed with the quality.
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Now the dirty secret: HTLCs are not really used most of the time.
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