I mean, my mindset is "we'll just figure it out if we start 😅", but maybe the new chrome file system api?
I haven’t heard of one, but sounds like a great idea! Where would you store the block and UTXO data?
Discussion
Yeah, file system API is probably a good bet. Especially since Bitcoin core already uses block files. You could maybe consider IndexedDB, but I think that would be a bigger lift.