I was thinking around http://lightning.network/ .
My problem is Alice sending coins to Bob via Eve:
A -- tx1 -> E -- tx2 -> B
Is there a way to condition tx1 on Eve signing tx2?
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Not directly, but you could do something similar by combining tx1 and tx2 into a single transaction.
So, instead of:
Input | Output Alice (1 BTC) | Eve (1 BTC)
Input | Output Eve (0.99 BTC) | Bob (0.99 BTC)
you could use:
Input | Output Alice (1 BTC) | Eve (0.01 BTC) | Bob (0.99 BTC)
This doesn't seem useful for the lightning network, because you really don't want to have a payment fail just because a settlement somewhere along the path failed.