I'm reading about lightning and I have a few questions:
The HTLC contract seems to be different at each new path payment channel is opened (due to a different Hash value that needs to be provided), but from my understatement, the channel opens in an independent and in advance to the payments in that channels, between two parties. How is it possible? Does the HTLC is not written on the blockchain?
This part confuses me.
Are there are known ways to extend the time of a channel before the predefined period time is over? (without closing and opening a new channel)?