> For the complete documentation index, see [llms.txt](https://docs.aetrna.cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aetrna.cloud/overview/welcome.md).

# Welcome!

Aetrna ("*eternal*" or "*forever*" from Latin) is a cloud service to efficiently store files and sign agreements over blockchains. Aetrna is designed to provide access to the data even if the app goes offline decades later. 

There are no databases used, the plaintext data of the files never leaves your browser, most operations are done on-chain and cross-provable. You do not need to verify your identity or register via email address, the only identifier needed is your web3 wallet.

Current list of features:

1. [Upload](/features/upload.md) — store or share the files inside blockchain forever or temporarely, privately or publicly
2. [Download](/features/download.md) — get the uploaded file from blockchain, decrypt in browser or offline
3. [Transfer](/features/transfer.md) — share the files with anyone with web3 wallet. Publicly or privately.
4. [Library](/features/library.md) — access uploaded, transferred or certified files
5. [eSign](/features/esign.md) — sign documents across multiple parties and store the document with signatures in blockchain. 
6. [Docs Verification](/features/docs-verification.md)— Seemlessly verify integrity and autheticity of the signed doc and signatures.

For more details, check the dedicated pages for each feature.

The app is in open alpha test, more features and documentation will be added in near future, meanwhile check out the [Updates](/overview/updates.md) and join the [Public testing](/overview/public-testing.md).


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