Correction: the bitcointalk link above is wrong, it should be https://bitcointalk.org/index.php?topic=244656.0 https://bitcointalk.org/index.php?topic=244656.0.

Correction: the bitcointalk link above is wrong, it should be https://bitcointalk.org/index.php?topic=244656.0 https://bitcointalk.org/index.php?topic=244656.0. I also got the times wrong because of that - BitcoinJ released payment channel support 2.5 years ago, not "nearly two years ago" as in the original comment (which cannot be edited now).