1. introduction
2. what is blockchain
3. benefits and use cases
4. blockchain security
5. bitcoin and proof of work consensus
6. Inherent Centralization of PoW blockchains
7. bitcoins lack of sustainability
8. scalability of bitcoin
9. xpeerchain and proof of stake consensus
10. efficient and sustainable security
11. economics or xpeerchain
12. scalability of xpeerchain
13. a stronger foundation to build upon