Bitcoin is bigger than the Bitcoin blockchain.
Bitcoin (BTC) the asset is tracked on the Bitcoin blockchain and transferred over the Bitcoin network (usually). If this was the end of the story, it would be a problem, since the Bitcoin blockchain is first generation technology with limited throughput and features.
But BTC can be used on other protocols and networks. The Lightning Network is a layer 2 protocol that allows for numerous fast and cheap BTC transfers that settle to and are secured by the Bitcoin network. People may also use sidechains, drivechains, and other L2 or L3 solutions.
[This] means that BTC is unlikely to be rendered obsolete by competing protocols that offer incremental improvements. BTC users can access those features or greater bandwidth by using BTC on other protocols like LN.
2019-02-08 | Full Review