bip32 hd wallets – How get fingerprint after derive parent key?

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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?



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