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How to get private key of derived address? #905
Description
I'm trying to get the private key of the derived address generated from the code below.
I know I must pass my private key somewhere, but I do not know where. This problem is the function $child_key->getPrivateKey(). It returns an error: Unable to get private key, not known.
$xpub = '...........';
$pubkeytype = substr($xpub, 0, 4);
$bitcoin_prefixes = new BitcoinRegistry();
$adapter = Bitcoin::getEcAdapter();
$slip132 = new Slip132(new KeyToScriptHelper($adapter));
if ($pubkeytype == 'xpub') $pubPrefix = $slip132->p2pkh($bitcoin_prefixes);
if ($pubkeytype == 'ypub') $pubPrefix = $slip132->p2shP2wpkh($bitcoin_prefixes);
if ($pubkeytype == 'zpub') $pubPrefix = $slip132->p2wpkh($bitcoin_prefixes);
$config = new GlobalPrefixConfig([new NetworkConfig(NetworkFactory::bitcoin(), [$pubPrefix])]);
$serializer = new Base58ExtendedKeySerializer(new ExtendedKeySerializer($adapter, $config));
$key = $serializer->parse(NetworkFactory::bitcoin(), $xpub);
$child_key = $key->derivePath($path);
return [$child_key->getPrivateKey(), $child_key->getAddress(new AddressCreator())->getAddress()];
Thank you!
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[-]How to get private key of derived address from?[/-][+]How to get private key of derived address?[/+]