[Lightning-dev] Lightning over taproot with PTLCs
Anthony Towns
aj at erisian.com.au
Mon Oct 11 06:29:51 UTC 2021
On Sat, Oct 09, 2021 at 11:12:07AM +1000, Anthony Towns wrote:
> 2. The balance transaction - tracks the funding transaction, contains
> a "balance" output for each of the participants.
> 3. The inflight transactions - spends a balance output from the balance
> transaction and provides outputs for any inflight htlc/ptlc transactions.
> 4. Layered transactions - spends inflight htlc/ptlc outputs by revealing
> the preimage, while still allowing for the penalty path.
I don't think the layering here quite works: if Alice forwarded a payment
to Bob, with timeout T, then the only way she can be sure that she can
either reclaim the funds or know the preimage by time T is to close the
channel on-chain at time T-to_self_delay.
Any time later than that, say T-to_self_delay+x+1, would allow Bob to
post the inflight tx at T+x (prior to Alice being able to claim her
balance directly due to the to_self_delay) and then immediately post the
layered transaction (4, above) revealing the preimage, and preventing
Alice from claiming the refund.
Cheers,
aj
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