sorry, i wasnt clear and im probably still missing something glaringly obvious with this. The return transaction would be similar to the locktimed refund talked about in [1] where there is a nonce/challenge of e2=H(L||kI2*G+kA2*G) for a locktimed refund. If a payment channel has a return transaction with a similar challenge at locktime L, a payment channel tx with a locktime at L-1, then a new return transaction with L-2 would surely make the payment channel tx now redundant ? Do you know where Im going wrong with this thinking ?
[1] https://lists.launchpad.net/mimblewimble/msg00047.html On Tue, Aug 22, 2017 at 10:41 PM, Andrew Poelstra <apoels...@wpsoftware.net> wrote: > > I'm not sure what you mean by "at a lower height"...there isn't really any > way to revoke transactions, in the sense that you want, that I'm aware of. > > > On Tue, Aug 22, 2017 at 06:21:25PM +0100, Quirinus Quirrell wrote: > > I was looking at payment channels in mimblewimble and I wasnt clear if > they > > could be bi-directional, by revoking transactions. The whitepaper talks > > about increase value v. > > > > I think a transaction in a channel could just be revoked by B signing a > new > > return transaction, but at a lower height than the transaction being > > revoked. New transactions that A signs would be at a decreasing height. > > > > Publishing spends would have to be timed carefully, and the size of the > > channel would gradually shorten, but they have to close anyway... > > > > Q > > > -- > > Mailing list: https://launchpad.net/~mimblewimble > > Post to : mimblewimble@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~mimblewimble > > More help : https://help.launchpad.net/ListHelp > > > -- > Andrew Poelstra > Mathematics Department, Blockstream > Email: apoelstra at wpsoftware.net > Web: https://www.wpsoftware.net/andrew > > "A goose alone, I suppose, can know the loneliness of geese > who can never find their peace, > whether north or south or west or east" > --Joanna Newsom > >
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