How do pass a 'blob' from frontend to backend?

I'm having trouble doing this without converting an audio Blob to base64 and then decrypting it and creating a file on the server. Base64 is huge and breaks the app, but if I create it client side it's no problem. However I don't want to expose API keys that I need in order to do so (which it does currently). Any ideas on what I could do?
I’ll take a look, thank you.

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