TON Payments is a part of infrastructure of Telegram Open Network dedicated to ensuring cheap and fast (micro)payments, see TON Payments, chapter 5 in Nikolai Durov, Telegram Open Network, technical overview, Dec 2017, 132 pp. pdf, mirror pdf
Joshua Lind, Ittay Eyal, Peter Pietzuch, Emin Gün Sirer, Teechan: payment channels using trusted execution environmentsarxiv/1612.07766; Lind J, Eyal I, Kelbert F, Naor O, Pietzuch P, Sirer G S. Teechain: Scalable blockchain payments using trusted execution environmentsarXiv/1707.05454
C Decker, R Wattenhofer A fast and scalable payment network with bitcoin duplex micropayment channels Symposium on Self-Stabilizing Systems, 2015
Andrew Miller, Iddo Bentov, Ranjit Kumaresan, Christopher Cordi, Patrick McCorry, Sprites and state channels: payment networks that go faster than lightningarxiv/1702.05812
A secure versatile light payment system based on blockchaindoi
A simple Ethereum payment channel implementationgridplus