Nostr Web Client

Have you tried a self hosted Electrum server? That is exactly what you are looking for

It looks like electrum also needs to have some copy of the chain state? So I need another 20-800gb?

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Kind of, only the scriptpubkeys.

I see some sort of "pruning" is supported. It's just getting expensive to have this many copies of stuff around.

This will delete old blocks

And by extension break yout electrum server.

Bummer. So I should provision another 500gb-1tb of disk space?