IOTA and i think Cardano use "block tangles" and i think some space chain shit that Bram Cohen is involved with, or was that um... some sprout thing...

there has been multiple attempts at doing concurrent chains. ah yeah, ICP is another one. And arweave too. all the hype about "rollups" is about this, and Liquid is basically a kind of concurrent chain attached to bitcoin, and all those ordinals are another kind of concurrent chain attached to bitcoin.

the thing is, they don't really solve a problem that wasn't already addresed by IP, DNS and HTTP... making the data transparently redundant, is something that nostr or similar type of event protocol is uniquely capable of doing though. IPFS is also similar, in that it has a primary key based on the content of the event data. but the real challenge is making it into a "consensus"

i think the problem is, you don't need to. you just pick your data sets, replicate them, and spiders can index everything and locate it. it's not a consensus, it's just a self-mapping system.

what's already happening to nostr's kind 1 feed and associated user metadata is already sprawling into a hive of near total replicas of the same data set, at least in the short time scale.

what i find most appealing about the protocol though, is the fact it lets you build anything on top of it. except for the One True Money Ledger bitcoin. but you can build a facebook, a snapshat, an instagram, a twitter. it is just a generic, open format for the same type of data those sites work with, that is deliberately designed to be leaky, so anyone can repurpose the data if they can read it.