You totally can use RFC6979.
BIP340 even says how to do it: https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#alternative-signing
conduition
npub1l6…6zvtg
2024-02-21 03:14:38
in reply to nevent1q…4s33
Author Public Key
npub1l6uy9chxyn943cmylrmukd3uqdq8h623nt2gxfh4rruhdv64zpvsx6zvtgPublished at
2024-02-21 03:14:38Event JSON
{
"id": "40329ae4068488c777ff7a39e2890ed4b97e8dbf877d6c2e765d971cbbbf64ec",
"pubkey": "feb842e2e624cb58e364f8f7cb363c03407be9519ad48326f518f976b3551059",
"created_at": 1708485278,
"kind": 1,
"tags": [
[
"e",
"0e887ddefa96e4ab48cd7204510033307f5dcd94e62977e6fea470454d3a4cbe",
"",
"root"
],
[
"p",
"e1ff3bfdd4e40315959b08b4fcc8245eaa514637e1d4ec2ae166b743341be1af"
],
[
"r",
"https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#alternative-signing"
]
],
"content": "You totally can use RFC6979. \n\nBIP340 even says how to do it: https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#alternative-signing",
"sig": "14e75decc1cac4e5379c09b6394bfdeaf2a529a7185717270c1b4c7d31ee14cd5325284aa069b5165e964c0e3f02c4b38ca9255da6ff631231d22304f6f910a6"
}