Oh that's a cool idea!
Fuse seem to be the cutting edge in regards to filters at the moment.
With a similar idea in mind, I have experimented with bloom filters on my blossom server implementation.
https://almond.slidestr.net/_bloom
there is also a serverside check to debug:
I haven't really used it yet but my idea is to have "edge blossom servers" that proxy to "backend blossom servers" and the filter would be a great optimization if the proxy had knowledge where to find a specific blob. It could also be used in clients, to speed up failover to other blossom servers.
Have to look into those binary fuse filters now.
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