[**Lightning Network**](https://lightning.network)  - Instant, low-fee transactions 
[**Schnorr Signatures**](https://medium.com/@SDWouters/why-schnorr-signatures-will-help-solve-2-of-bitcoins-biggest-problems-today-9b7718e7861c) - Scaling & privacy
[**MimbleWimble**](https://github.com/mimblewimble/grin/blob/master/doc/intro.md) - Privacy
[**Rootstock**](https://www.rsk.co/#resources) - Smart contracts
[**Ivy**](https://blog.chain.com/ivy-for-bitcoin-a-smart-contract-language-that-compiles-to-bitcoin-script-bec06377141a) - Smart contracts
[**Komodo**](https://www.komodoplatform.com/en) - Decentralized exchange
[**Atomic Swaps**](https://hackernoon.com/atomic-swap-why-its-a-game-changer-for-exchanges-fb1380f5cb6c) - Cross chain trading

![bitcoin2.jpg](https://steemitimages.com/DQmYFVEbHdUquhy4zJXEsTVfXtUkHooS3dPF9kD6BtPjQrk/bitcoin2.jpg)