In Mastering Bitcoin a sample LN transaction is explained using the example of Alice sending 1BTC to Eric by using channels between three other network participants (Bob, Carol, and Diana).
It is mentioned that Hash Time Lock Contracts (HTLC) are used with a 10-block refund timeout (see illustration from Mastering Bitcoin's github: https://github.com/bitcoinbook/bitcoinbook/blob/develop/images/mbc2_1207.png).
My question is: Why is the refund period decreased by one block for each hop in the network?
Given that these hops, e.g. between Bob and Carol happen much faster than block confirmations, I'm not sure I'm fully following the logic here. On the illustration it looks like like the refund period for the last transaction between Diana and Eric is only 7. Why has it decreased by 3 blocks?
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