user4034: I was reading this blog post From Classic to Hydra and I was wondering which version of Ouroboros is currently implemented in Cardano: Classic, BFT or Praos?

user4023: Updated: July 26th, 2022.
Ouroboros family implementations

Classic implemented in 2017
BFT implemented
Praos is currently running
Genesis development's in progress...
Hydra development's in progress...
Crypsinous development’s in progress...
Chronos development’s in progress...
Omega brings together Classic, Praos, Genesis, Redux, Chronos, etc...


Details you can find in my medium story Twenty interesting facts about Cardano.
Eras
Some of the above algorithms have mutually dependent ingredients for launching a certain era:

Byron Era (Foundation) – reached in 2017
Shelley Era (Decentralization and delegation) – reached in 2020

Allegra Sub-Era (Token locking mechanism)
Mary Sub-Era (Multi-asset implementation)


Goguen Era (Smart Contracts, DeFi, Dapps) – hit Testnet in September 2021

Alonzo Sub-Era (Smart Contracts implementation)
Babbage Sub-Era (Eliminates flaws of Alonzo)
Vasil Sub-Era (Increases network's scaling capabilities) – reached in July 2022


Basho Era (Scaling) – development's in progress...
Voltaire Era (Governance) – development's in progress...


4034: <p>I was reading this blog post <a href="https://iohk.io/en/blog/posts/2020/03/23/from-classic-to-hydra-the-implementations-of-ouroboros-explained/" rel="nofollow noreferrer">From Classic to Hydra</a> and I was wondering which version of Ouroboros is currently implemented in Cardano: Classic, BFT or Praos?</p>
 4023: <p>Updated: July 26th, 2022.</p>
<h2>Ouroboros family implementations</h2>
<ul>
<li><strong>Classic</strong>    <em>implemented in 2017</em></li>
<li><strong>BFT</strong>        <em>implemented</em></li>
<li><strong>Praos</strong>      <em>is</em> <em><strong>currently running</strong></em></li>
<li><strong>Genesis</strong>    <em>development's in progress...</em></li>
<li><strong>Hydra</strong>      <em>development's in progress...</em></li>
<li><strong>Crypsinous</strong> <em>development’s in progress...</em></li>
<li><strong>Chronos</strong>    <em>development’s in progress...</em></li>
<li><strong>Omega</strong>    <em>brings together Classic, Praos, Genesis, Redux, Chronos, etc...</em></li>
</ul>
<p><br></p>
<p><em><strong>Details you can find in my medium story <a href="https://medium.com/geekculture/cardano-911-twenty-interesting-facts-about-cardano-6e165914d1e8" rel="nofollow noreferrer">Twenty interesting facts about Cardano</a></strong></em>.</p>
<h2>Eras</h2>
<p>Some of the above algorithms have mutually dependent ingredients for launching a certain era:</p>
<ul>
<li><strong>Byron Era</strong> (Foundation) – <em>reached in 2017</em></li>
<li><strong>Shelley Era</strong> (Decentralization and delegation) – <em>reached in 2020</em>
<ul>
<li><strong>Allegra Sub-Era</strong> (Token locking mechanism)</li>
<li><strong>Mary Sub-Era</strong> (Multi-asset implementation)</li>
</ul>
</li>
<li><strong>Goguen Era</strong> (Smart Contracts, DeFi, Dapps) – <em>hit Testnet in September 2021</em>
<ul>
<li><strong>Alonzo Sub-Era</strong> (Smart Contracts implementation)</li>
<li><strong>Babbage Sub-Era</strong> (Eliminates flaws of Alonzo)</li>
<li><strong>Vasil Sub-Era</strong> (Increases network's scaling capabilities) – <em>reached in July 2022</em></li>
</ul>
</li>
<li><strong>Basho Era</strong> (Scaling) – <em>development's in progress...</em></li>
<li><strong>Voltaire Era</strong> (Governance) – <em>development's in progress...</em></li>
</ul>
