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BIP341: Clarify tweaking of secret keys

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Brandon Black 2021-10-29 15:01:39 -07:00
parent d690408080
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@ -175,6 +175,8 @@ The parity bit will be required for spending the output with a script path.
In order to allow spending with the key path, we define <code>taproot_tweak_seckey</code> to compute the secret key for a tweaked public key.
For any byte string <code>h</code> it holds that <code>taproot_tweak_pubkey(pubkey_gen(seckey), h)[1] == pubkey_gen(taproot_tweak_seckey(seckey, h))</code>.
Note that because tweaks are applied to 32-byte public keys, `taproot_tweak_seckey` may need to negate the secret key before applying the tweak.
<source lang="python">
def taproot_tweak_pubkey(pubkey, h):
t = int_from_bytes(tagged_hash("TapTweak", pubkey + h))