/**
 * 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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