Any interested person may release an attorney’s lien by executing an undertaking in an amount double the amount claimed, or in such other amount as may be fixed by a judge of the district court of the county in which the lien is filed or in which the subject of the lien is held. The undertaking must be conditioned to pay to the attorney the amount finally due the attorney for the attorney’s services, which amount may be ascertained by suit on the undertaking. The undertaking must be filed after approval by the clerk of court of the county. Any interested person may make written demand upon the holder of an attorney’s lien for a bill of particulars of the services and amount claimed for each item or upon each written contract with the person for whom the services were rendered, and thereupon, unless such bill of particulars is furnished within ten days after service of the demand, the lien must be released.