A review of Roostock (RSK) a second layer built on top of Bitcoin, what its use cases are, why you may want to use it and the pros and cons of Roostock| The Bitcoin Manual
The Liquid Network is a Bitcoin side chain providing faster and more confidential Bitcoin transactions - find out more here.| The Bitcoin Manual
The Lightning Network is built on top of Bitcoin's main chain and facilitates instant and near feeless transactions - find out more here.| The Bitcoin Manual