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Currently HTLC's timeout transaction relies on absolute timelock enforced on the script. It allows a counterparty to withdraw the money from the contract if the other party doesn't release the preimage. What would have been the problem if instead of using timelock before the counterparty can unlock its money, the condition is replaced with timelock puzzle? The time taken to solve the puzzle will be same as the locktime of the offchain contract.

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  • How do you (gu)estimate the "time taken to solve the puzzle" ?
    – darosior
    Aug 25 '20 at 11:25
  • That can be decided by the sender who wants to initiate payment Aug 25 '20 at 11:37
  • Lightning HTLCs use relative timelock (CSV) not absolute (CLTV). This is because we don't know when the commitment tx will be confirmed (it is offline)
    – pinhead
    Aug 25 '20 at 11:43
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    I was talking about the timeout period of HTLC within which the counterparty must provide the preimage in order to claim payment. Isn't that using an absolute timelock? Aug 25 '20 at 12:01
  • sorry you're right - in fact CSV and CLTV are both employed in different LN use cases: github.com/lightningnetwork/lightning-rfc/blob/master/…
    – pinhead
    Aug 25 '20 at 12:13

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