Also re. decentralized search: Negatives are hard to prove so I'd be careful with "it's not possible". This here looks promising:
https://www.cs.cornell.edu/~bwong/Cubit/
nostr:note154eyvuyvkrhf203ptx8dsnc63dexag2dwkpuhmet5kxaxkwlznasas8a6d
Discussion
Sigh... anyone can make up this stuff, it is impossible, and I will bet money on that.