Specifically interested in which features of the various protocols will be interoperable with each other. Eg/ will the DID’s within Block’s TBD protocol be interoperable with Holepunch and/or Synonym’s Slashtags?
Interoperability in this context is a red herring. Specs and protocols compete, and eventually there is capitulation to the winner that gets the most support and thus most tools, in the most coding languages, for the most OS's, with the most end users, skin in the game, etc.
Interoperability is not easy even when you cooperate. People use different languages to program in on both the base/native level, and then in implementations at app level, and then syncing over protocol/specs is another issue.
Even LN implementations are not fully interop.
Interoperability just means people using the same thing, but these are all different things (Slashtags, Web5, nostr) despite them solving some overlapping use cases. So what is really needed is some combination of migration, resolvers, aliasing, conversion, support for multiple formats in clients, etc, etc.
You probably won't see much of that at this stage. This is not to say that Synonym is closed-minded or stubborn, so much as all of our teams have to manage our priorities. Synonym has actively researched, contacted, and collaborated as often as possible, but this environment, so far is honestly one of the more hostile and collaboration-disinterested I have encountered. Very competitive.
I personally think managing keys across formats, resolving/aliasing, is an interesting problem, but until there are actually two popular formats, it is merely a curiosity and academic challenge, thus not a priority.
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That's a good take
Personally, from where I'm sitting, I see it as two horse race between:
Nostr + bitcoin IPFS + altcoins
Not to belittle other efforts, I wish them well. There's various other things out there that may change the game, but more or less those two, have, and will continue to have traction, imho
Smart would be to pivot to one or the other, at least as a side-gig, nostr likely being the non-fiat option
The linked data world has some traction but no payments, in general
IPFS ahead, but nostr with some momentum
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