A limitation on most existing micropayment channel ideas is that payments can only flow in one direction. 

It's worth noting that the original protocol as designed by Satoshi did not have this limitation. It has evolved this way because of ad-hoc DoS fixes over time (btw I'm not saying they were the wrong thing to do, as non "ad hoc" solutions are significantly more work). But it seems like eventually a different approach to handling DoS attacks based on resource prioritisation and scheduling will become needed / implemented, and at that point the original design could be safely brought back to life.

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