/**
* Co-sign a PSBT.
* Simply a wrapper around `utxolib.bitgo.createPsbtFromBuffer` and `psbt.signAllInputsHD`.
* @param params
*/
export declare function signPsbtRequest(params: {
psbt: string;
keychain: {
xprv: string;
};
} | unknown): {
psbt: string;
};
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