user124350: After derive parent key i have IL, IR and pIL
Then i get ki:
curve_n = 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141';

ki = remainder((pIL + priv), curve_n);

I know that parentFingerpring is:
parentFingerprint = slice(rdm160(sha256(UNKNOW)), 4);

what varable or operation must be instead of UNKNOW?

user48884: UNKNOWN is the serialized compressed public key for ki. ki is the private keys, so compute the public key for it and serialize it in compressed form.

124350: <p>After derive parent key i have IL, IR and pIL</p>
<p>Then i get ki:</p>
<pre><code>curve_n = 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141';

ki = remainder((pIL + priv), curve_n);
</code></pre>
<p>I know that parentFingerpring is:</p>
<pre><code>parentFingerprint = slice(rdm160(sha256(UNKNOW)), 4);
</code></pre>
<p>what varable or operation must be instead of UNKNOW?</p>
 48884: <p><code>UNKNOWN</code> is the serialized compressed public key for <code>ki</code>. <code>ki</code> is the private keys, so compute the public key for it and serialize it in compressed form.</p>
