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# Hush Delayed Proof Of Work
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The software which performs the actual action of injecting data into blockchains is called *Dragon*.
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It's not a silent *Dragon*, it's quite talkative and likes to talk about blockhash data across
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chains. You could say it spits DPoW fire cross-chain.
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Dragon is an evolved form of a previous software called iguana. Dragons are bigger and better
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than iguanas, as everybody knows.
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## Differences from Iguana
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Dragon inherits some features from Komodo [Iguana](https://github.com/komodoplatform/dpow), specificallly those needed to make notarizations, and the
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dependencies of those algorithms. Large amounts of non-notarization code was deleted in the making
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of dragon, drastically reducing the attack surface, increasing maintainability and reducing RAM/CPU
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at compile-time and run-time. Some things that were deleted
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* Old version of libjpeg (8.4) that has CVE's: https://nvd.nist.gov/vuln/detail/CVE-2020-14153
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* JUMBLR, a failed mixer project
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* Market-making bots
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* APIs to talk with various exchanges that either don't exist or are being investigated
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* InstantDEX, a failed precursor to BarterDEX/AtomicDEX
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* Datachain, experimental precursor to KV
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* Ramchain - not even sure but it got deleted
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## Installing Dragon
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### Build instructions for NN operations:
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```
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cd dragon
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```
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### Build dragon for notary operations
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```
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./m_notary_build
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```
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### Start main-net notarizations:
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```
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./m_notary_HUSH
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```
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### Start 3rd party notarizations:
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```
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./m_notary_3rdparty
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```
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### Running Production
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Get those bath salts ready.
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### To build and launch in one step
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Run
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```
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./m_notary
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```
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## License
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GNU Public License Version 3
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## Copyright
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See [AUTHORS](https://git.hush.is/hush/dragon/src/master/AUTHORS) for details.
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