I think this matters, since it means I can run a single instance to support all of my projects, regardless of language, because everything speaks HTTP. I don't have to grapple with OmniAuth for Ruby, AllAuth for Python, Passwordless for Node, and lord knows what for experiments in Clojure, Elixir, and Rust. I don't have to set up outbound email, register social API keys, and design a hybrid login form for each of those projects, either. Set up Portier once, and I'm done. I've written more about Persona's failings and virtues at https://github.com/portier/portier.github.io/blob/master/Oth..., which might better explain why I view this as a successor.
As to Identity Providers... as long as websites utilize email addresses as a way of identifying accounts and resetting passwords, we're in the same place. Portier makes this no worse. I sympathize with the notion that identity should not be leased from a third party, but I don't know how to solve that. Blockchains? I'd encourage others to pursue that future while Portier tries to carve out an ephemeral but useful island in the present.
I see. Thanks for clarifying!
I just thought Persona was about privacy (IdPs unaware about identity consumers), and potential browser integration - this was its good points. So, when comparing to Persona, this one looks pale to me.
TBH, I don't see any necessity to prove chronologies or require global consensus, unless a globally-unique human-readable identities (like email addresses, but actually owned) are desirable. But are they? I mean, when I walk in some company's reception desk, I don't normally show them some universally recognized ID, I just say "hi, I'm your customer, we had business before - you know me as Aleksey".
Just that I believe it's good to have an authentication protocol (something better than usernames-and-passwords) that is universally accepted, rather than an universally accepted identity. Do you know, does general audience wants it differently?