<p>Bitcoin main net was launched on January 3, 2009 at 19:15:05 UTC. But what is the history of the two other network options in Bitcoin: <code>testnet</code> and <code>regtest</code>?</p>
<p>I think <code>testnet</code> is on version 3, what was version 2, 1 (and 0)? And when was the <code>regtest</code> option added to Bitcoin Core?</p>

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2021-09-17T07:19:10.710Z
Related to https://bitcoin.stackexchange.com/questions/9975/has-the-testnet-ever-been-reset but also asks about `regtest` network option.
Thorkil Værge
<testnet><regtest><history>
History of Bitcoin's Networks
Thorkil Værge
# History of Bitcoin's Networks

(Asked by: username_0 on 2021-09-17)

Bitcoin main net was launched on January 3, 2009 at 19:15:05 UTC. But what is the history of the two other network options in Bitcoin: `testnet` and `regtest`?

I think `testnet` is on version 3, what was version 2, 1 (and 0)? And when was the `regtest` option added to Bitcoin Core?

**Tags:** testnet, regtest, history

> **Comments:**
> **username_0**: Related to https://bitcoin.stackexchange.com/questions/9975/has-the-testnet-ever-been-reset but also asks about `regtest` network option.  

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