There's at the very least length mismatches. Npub's are 32 bytes; BIP-85 will give you an xpriv which you can extract a 33 byte key from.
I mean, maybe you could just truncate the string and treat it as an nsec and derive an npub from it, but there's no way to get from the xpub to the npub, so I'm not sure what the benefit would be aside from it being 'already backed up' with your Bitcoin backup. Just likely bad entropy.
Cykros
npub1lc…63apw
2026-01-28 11:08:14 UTC
in reply to nevent1q…3j20
Author Public Key
npub1lcetwt8hcd9gagdytu4e35ufykxek0elfvx8q3spugmgj9x0ev0q363apwPublished at
2026-01-28 11:08:14 UTCEvent JSON
{
"id": "7276bab89700a6002536da1fdc545cb3d9284c42a41205c41e477cb47489fa99",
"pubkey": "fe32b72cf7c34a8ea1a45f2b98d389258d9b3f3f4b0c704601e2368914cfcb1e",
"created_at": 1769598494,
"kind": 1,
"tags": [
[
"alt",
"A short note: There's at the very least length mismatches. Npub'..."
],
[
"e",
"74520d5d3c2444002ffc3eb99abbb6292fed69dace8b0ad4c808f37f34f5c32f",
"wss://relay.damus.io/",
"root",
"ae4c17620c9b3a0413fd019fd7e983da43b2081e7169abecb7764c333a9bfff1"
],
[
"p",
"1989034e56b8f606c724f45a12ce84a11841621aaf7182a1f6564380b9c4276b",
"ws://bugman.mguy.net:4848/"
],
[
"p",
"45904b28ffe0e5cb9132f9a08e976ed7f0fc57d8387781ea9c80f256c412c1b4",
"wss://premium.primal.net/"
],
[
"p",
"ae4c17620c9b3a0413fd019fd7e983da43b2081e7169abecb7764c333a9bfff1",
"wss://premium.primal.net/"
]
],
"content": "There's at the very least length mismatches. Npub's are 32 bytes; BIP-85 will give you an xpriv which you can extract a 33 byte key from.\n\nI mean, maybe you could just truncate the string and treat it as an nsec and derive an npub from it, but there's no way to get from the xpub to the npub, so I'm not sure what the benefit would be aside from it being 'already backed up' with your Bitcoin backup. Just likely bad entropy.",
"sig": "4c8707d5e3d6202558e7d6f961d749715c8a5cc363e81c8d8ded694671a65766942c247c00665224fb72fb647c927e03cbd809fa7919390d03b9bb5c1ab9f6c1"
}