Perun
Virtual Payment and State Channels.
Perun network is a system of payment and state channels over Ethereum. The Perun Network is a framework that supports off-chain protocols for simple payments and generic smart contract off-chain execution. Perun's channels can be virtual, which means that off-chain transactions do not require interaction with intermediaries thereby further reducing trust, latency and costs. In additional Perun offers strong security guarantees backed up by scientific methods from cryptographic research.