> For the complete documentation index, see [llms.txt](https://rhys-nemo.gitbook.io/tokenomics-bible/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://rhys-nemo.gitbook.io/tokenomics-bible/protocols-and-utility/shadow-drive.md).

# Shadow Drive

“Shadow drive is a second layer on top of the Solana Chain - as apposed to its own standalone chain”.

![](https://3505330573-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F17Y4ZB0dl280NH9CAMkR%2Fuploads%2FCrEKNyqRySVESZ53G5zK%2Fimage.png?alt=media\&token=36d1c480-b2d8-4d82-955f-c5c1f3da7b1b)

**Shadow Drive IPFS** - Solana based IPFS (permission less cloud for storing data) powered by the Solana blockchain. Shadow Drive is a second layer protocol that has it's own proof of stake.

**$SHDW** - coin <https://shdw.genesysgo.com/><br>

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**Shadow Drive VS Arweave**<br>

| **Shadow Drive**                      | **Arweave**                           |
| ------------------------------------- | ------------------------------------- |
| Built for Solana                      | Multi chain                           |
| Proof of history - on chain storage   | IPFS                                  |
| Requires consensus (on chain)         | Does not require consensus (on chain) |
| Aims to be permission-less/trust-less | Requires centralised team             |

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Key terms:

* CDN
* State machine
* I/O
* Ceph - <https://ceph.com/assets/pdfs/weil-crush-sc06.pdf>
* Horizontal & Vertical scaling
* Object based storage&#x20;
* Blocks - new block created every 400 milliseconds
* Ledger (blockchains are ledgers) - record history of how things have changed over time & all of those changes combined give you the current “state”. Solana is about “Accounts” & the “State” of those accounts