This NIP is not yet in main. Here is an overview of PRs referencing this NIP.
NIP-XX - Nostr Token Login OPEN @arthurfranca
Fix typo "NIP: 26" to "NIP-26" MERGED @AsaiToshiya
Add context for limiting `before` timestamp MERGED @sethforprivacy
Add protocol handler for oauth-style delegation to NIP26 OPEN @earonesty
More precise wording on delegation conditions in NIP-26 OPEN @sistemd
Implement Markdownlint GitHub action OPEN @mariano-perez-rodriguez
Markdown improvements, embelishments, and standardizations CLOSED @mariano-perez-rodriguez
NIP-26 allow delegator to delete events published by delegatee MERGED @CodyTseng
Update all NIPs to include 'depends' and 'mentions' tags OPEN @blakejakopovic
NIP-26: Add hint notes on typical delegation UX flow (by copy&paste of delegation tag) OPEN @optout21
[NIP-26] Minor change to make delegation token/string naming consistent MERGED @optout21
Add `content` restriction to NIP-26 CLOSED @pablof7z
[NIP-26] Fix for multiple `kind`s in delegation conditions MERGED @kdmukai
NIP-26: Advice on using after operators in conditions query string MERGED @bhayward93
NIP-26: fixing typo in conditions query string section MERGED @zackwy
NIP-26: adding section documenting valid fields and operators for conditions string MERGED @zackwy
NIP-26: Change example condition to expire at a future date MERGED @kdmukai
NostrAuth easily readable UIN address derived from pubkey  CLOSED @saranshisatgit
added examples CLOSED @monlovesmango
NIP-26: Delegated Event Signing MERGED @markharding