# Further Reading

To delve deeper into the Ouroboros protocol, from its inception to recent new features, follow these links:

1. [Ouroboros (Classic)](http://ia.cr/2016/889): the first provably secure proof-of-stake blockchain protocol.
2. [Ouroboros Praos](http://ia.cr/2017/573): removes the need for a rigid round structure and improves resilience against ‘adaptive’ attackers.
3. [Ouroboros Genesis](https://ia.cr/2018/378): how to avoid the need for a recent checkpoint and prove the protocol is secure under dynamic availability for trustless joining and participating.
4. [Ouroboros Chronos](http://ia.cr/2019/838): removes the need for a common clock.
5. [Reward sharing schemes](https://arxiv.org/abs/1807.11218) for stake pools.
6. [Account management](https://ia.cr/2020/525) and maximizing participation in stake pools.
7. [Optimizing transaction throughput](http://ia.cr/2020/037) with proof-of-stake protocols.
8. [Fast settlement](http://ia.cr/2020/675) using ledger combiners.
9. [Ouroboros Crypsinous](http://ia.cr/2018/1132): a privacy-preserving proof-of-stake protocol.
10. [Kachina](http://ia.cr/2020/543): a unified security model for private smart contracts.
11. [Hydra](http://ia.cr/2020/299): an off-chain scalability architecture for high transaction throughput with low latency, and minimal storage per node.


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