Some clients can add hashtags without citing them on the Text.
Discussion
Does the Nostr protocol allow it? It's very interested...
With Astral I see metadata of same note:
{
"id": "cc01f7e6a2b81dba9da597133d0ed4b8678a5c9553580b9344be09de3eafaef6",
"pubkey": "825722b7d74616524ee20c08414b6d33ac8c776a1120bff8c8e58484678977c1",
"created_at": 1679299514,
"kind": 1,
"tags": [
[
"t",
"nostrica"
],
[
"t",
"bitcoin"
]
],
"content": "Anyone ?",
"sig": "84d9d9ccb615d2e58793f46b69430343fb15fd564f0946653b0ca5fd00baa6ff2f7b5009a4862c3f850e7731753f41d67c18d53fc4202d91f4e0d140edeb1541"
}
Yep, everything is allowed :)