Kind 1 notes are defined in NIP-10:
https://github.com/nostr-protocol/nips/blob/master/10.md
Where it specifically states:
Markup languages such as markdown and HTML SHOULD NOT be used.
Innis
npub1l3…5cxyz
2026-06-05 02:42:56 UTC
in reply to nevent1q…zhur
Author Public Key
npub1l33660awkeycecn9grhrvzyn0fmes8245ke7k82y8njz8uqu3vlqk5cxyzSeen on
wss://nostr.momPublished at
2026-06-05 02:42:56 UTCEvent JSON
{
"id": "03ecbd5c6bbf64200e65199a60a58985bd78025741241464702e7fe65c2b0972",
"pubkey": "fc63ad3faeb6498ce26540ee3608937a77981d55a5b3eb1d443ce423f01c8b3e",
"created_at": 1780627376,
"kind": 1,
"tags": [
[
"e",
"e9a212e73c86ae2076055e06b7088f767c9eba7983ee23cee1f77740cdd4340d",
"",
"root"
],
[
"e",
"a9ceb42fdcf722718f5f6d455fbe7e8a18b56d4a61381484fa052165ac19f967",
"",
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],
[
"p",
"e4e847f9b3e29e930b3f05218767828f8ddd5ac177f5ad46a6616f52e5c37d6d",
""
],
[
"p",
"fc63ad3faeb6498ce26540ee3608937a77981d55a5b3eb1d443ce423f01c8b3e",
""
],
[
"client",
"Hubstr"
]
],
"content": "Kind 1 notes are defined in NIP-10:\n\nhttps://github.com/nostr-protocol/nips/blob/master/10.md\n\nWhere it specifically states:\n\nMarkup languages such as markdown and HTML SHOULD NOT be used.",
"sig": "320608433fb581069ee3b0d3e3ab7eaa959f9400090bdc58a045f44be2ad5bbc80fae46e12c2978e65a9e83400870c962532b7aa1cdfdc0c280cd62e285f24b1"
}