Consider A wants to send some funds to E. They don’t have a direct payment channel among them. So, they use a following path A-B-C-D-E. A is the sender of payment and E is final recipient.
E sends the hash of a secret r to A, A passes on the hash to B, B to C, C to D, and D to E. E discloses the secret to C (a partner in crime with E) and E do not respond to D. C gives the secret to B (settling the HTLC between them). Then, B gives the secret to A (settling the HTLC between them). A sent (and lost) the money, as E denies receiving the money (and the promised service/good). How the lightening network sees this? Out of their control? -- A_G
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