Update 19.md

Co-authored-by: lollerfirst <43107113+lollerfirst@users.noreply.github.com>
thesimplekid · Nov 14, 2024 · 8144ac8 · 8144ac8
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@@ -79,7 +79,7 @@ Here, `||` denotes string concatenation. The `B_` of each output is **a hex stri
 
 #### Signature scheme
 
-To mint a quote where a public key was provided, the minter needs to include signatures in the `PostMintBolt11Request`. We use `libsecp256k1`'s serialized 64-byte Schnorr signatures on the SHA256 hash of the message to sign as defined above.
+To mint a quote where a public key was provided, the minter needs to include signatures in the `PostMintBolt11Request`. We use a [BIP340](https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki) signature on the SHA-256 hash of the message to sign as defined above.
 
 # Minting tokens