Add username to first UCAN

[nichoth]

Summary

Add a username as a fact in the first UCAN created for an account.

Problem

From what I understand, usernames never change per account. It would make it easier to verify a DID + username if the username is recorded in UCAN.

Impact

Save you from needing to lookup a username + DID via DNS.

Solution

Add a fact when you call Ucan.build —

ts-odd/src/components/auth/implementation/wnfs.ts

Line 112 in 36c5e95

const fsUcan = await Ucan.build({

---

I don't think this would break any existing functionality.

[icidasset]

Thanks for the suggestion! I think we'll implement this for the upcoming rs-wnfs edition.