Checkout my demo of Oblivious message retrieval (OMR) - https://github.com/Janmajayamall/ObliviousMessageRetrieval. 

If you find this interesting then let's work together :)

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What's OMR ? It's a way for an untrusted server to send you pertaining messages/transactions from set of all messages without ever learning which ones actually do! 

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I am working on implementing OMR for wide adoption so that privacy focussed app/blockchain users don't have to trust servers! 

The implementation linked above isn't quite there yet, but I am working on improving it! 

For ex - adding SIMD support for underlying fhe library - https://github.com/Janmajayamall/fhe.rs
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Other than this there's no real word usage data on OMR - if someone (crypto-wallet, blockchain, privacy app) is interested in providing OMR to their users. Do lmk, I would love to integrate it.

Also if OMR interests you then you will be glad to know that OMR uses...

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BFV homomorphic encryption underneath. It's based on RLWE primitive. So working on OMR also means getting to learn FHE, which makes it a lot more fun!

/fin

It's very useful for privacy focussed blockchains / messaging apps, since it allows mobile/light clients to receive latest messages pertaining to them without trusting servers.

You can learn more about OMR on readme of github link above. 

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