宋仁宗时,姚涣在益州交子务当监理。这个“交子务”是专门管纸币流通的机构,那时候的纸币就叫“交子”。姚涣到交子务上任不久,便接到匿名信,说交子务大小官吏差不多都有贪污公款的行为,只是多少不等而已,官越大贪污得越多。姚涣决心把这件事搞清楚,调来几个心腹开始查交子务的 Renzong Song, Yao 交 Jiao Zi in Yizhou act as supervision. The “pay service” is a specialized agency for the circulation of banknotes, banknotes at that time called “pay.” Shortly after Yao took office, he received an anonymous letter saying that almost all the officials of the same age have committed embezzlement of public funds. Yao 涣 determined to make this matter clear, transferred a few confidante began to check the child service