the spec only says that only single letter tags have to be *indexed* not that any such tags other than a-zA-Z are invalid

it isn't supposed to index these tags, and if the spec for marketplaces depends on non-single-alphabetical-letter tags then it is wrong 

 like this one:

https://github.com/nostr-protocol/nips/blob/d251ca0da5372ba0ae0df76754d96068266a6778/24.md

this "title" tag key is wrong, for example, i don't know why it isn't `T` that is the logical one to use for that 

 just to clarify, what the spec states about indexing means that you can't search for this tag using a filter 

 Huh, ya and calendar events worked fine so that prob means my theory is wrong.  Could just really be malformed json, I'll have to snoop it on the wire. 

 this is why logging is so helpful - crazy ever changing protocols need it 

 Ohhh, interesting to know the indexing thing 🤔.. the world of nips 😎 

 yeah, filters are basically a super simple database query language