12 Blockchain: the road ahead

12.1       Decentralized identity

12.1.1   Self-managed identity

12.2       Consensus and integrity

12.2.1   Proof of work

12.2.2   Proof of stake

12.2.3   Byzantine fault-tolerant consensus

12.3       Scalability

12.3.1   Solutions

12.4       Privacy

12.4.1   Public, private and permissioned networks

12.5       Confidentiality

12.5.1   Open information

12.5.2   A solution

12.6       Security

12.6.1   Securing it with cryptocurrency

12.7       Accessing off-chain data (Oracles)

12.8       From foundations to practical systems

12.9       Blockchain, the road ahead

12.10    Best Practices

12.11    Wrapping it up

12.12    Summary