The banknotes Zhang Nan wants to take out are different. Although the Tang Dynasty can now make cheap paper, the technology of this cheap paper is still firmly grasped in Zhang Nan's hands, and even the Tang Dynasty officials do not know about this.

Zhang Nan gave the papermaking career to Cui Shao, which was equivalent to giving it to the Cui family. Although the Cui family is a family, Zhang Nan believes that Cui Shao would not be so stupid that he would give out such real money and silver to others.

Although the factory is in the hands of the Cui family, only two people know the real papermaking technology, one is Zhang Nan, and the other is Cui Shao, who gave the formula to Zhang Nan.

The work in the paper mill is carried out during work, and these workers only know the steps of their work. As for the previous or next step, they do not know it. This also ensures that the cheap paper made by Zhang Nan will not be known by the outside world.

Although Comrade Li Er wanted to use such cheap paper to restrain the aristocratic families, it was not the time yet, and the aristocratic families and the royal family have become more harmonious now, so Zhang Nan still chose to take this technology into his own hands.

This is more at ease for Li Er and other aristocratic families. Although ordinary people can afford paper now, for aristocratic families, as long as Li Er does not have the technology of cheap paper in their hands, they will be more at ease.

"Your Majesty, since copper coins are so easy to fake, our banknotes can ensure the authenticity of the currency to the greatest extent." Zhang Nan said.

"Are you so sure that this banknote will not be fake? According to my opinion, it is easier to counterfeit this banknote. Think about it, ordinary people in the Tang Dynasty can buy your cheap paper at will. Wouldn't it be easy to counterfeit it?" Li Er said in confusion.

"No, no, no, you are too worried. The paper I took out is very different from the paper sold on the market. This paper can even be wet and not broken after it is wet, and it has better toughness to ensure its use time." Zhang Nan said.

"Don't break when encountering water? Where can I find such paper? I don't believe it." Li Erdao.

"Your Majesty, if you don't believe it, you can try it." After Zhang Nan finished speaking, he took out a green picture of Grandpa Mao. Although Zhang Nan wanted to get a red picture of Grandpa Mao at first, he had no choice but to have a slightly larger face value, so Zhang Nan was also a little reluctant to let it go.

Li Er took the banknotes from Zhang Nan's hand and looked at them carefully.

"Qingquan, are you in the frame? This is not a paper currency, it is clearly a painting, the portrait is so lifelike." Li Er looked into the air with a pen and said.

"This is the banknote, and the paintings on it are just the design style of the banknote." Zhang Nan said.

"Oh? As of this, is this the banknotes you passed through the door? Then who is this person?" Li Er asked, looking at the avatar on the banknotes.

"...Well, this is a great man from our time travel gate. In order to commemorate him, we will print his avatar on the banknotes through the time travel gate." Zhang Nan thought for a while and said.

When Li Er heard Zhang Nan say this, he immediately stopped talking. Then a strange light appeared in his eyes. Zhang Nan knew very well what this light represented.

"If the emperor likes it, then when our Tang Dynasty banknotes are designed, you can also print your avatar on your head." Zhang Nan said helplessly.

"Okay! What I want is your words. It's true. I have a deep intention. Let's make this banknote first and let me see. If it is indeed feasible, let's discuss it." Li Eryi was immediately happy when he heard that Zhang Nan could also print his avatar on the banknote.

"Okay, that's all for today's matters. Tomorrow, Qingquan, please hand me a note. Bank matters can be put on the agenda. Compared with our Tang Dynasty, we need a lot of money to develop our technology and construction." Li Erdao.

"I obey the order." Zhang Nan bowed and said.

After returning to the mansion, Zhang Nan took out a note to build a bank based on the actual situation of Datang. The bank's name was "Datang Bank". In fact, Zhang Nan wanted to call it "Chang'an Bank" at the beginning, but this bank was aimed at the entire Datang, so it seemed a bit petty when he called Chang'an Bank. In the end, Zhang Nan denied this idea.

Although the bank's idea is good, it is still very difficult to operate. The first thing is to solve the problem of saving and withdrawing money. Datang does not have an Internet system, so how to unify the deposits and withdrawals of major prefectures is a big problem.

Although Zhang Nan also designed a passbook, it is relatively inconvenient, and identity verification is also a difficult task when withdrawing money. Without a network system, there is no way to set a password. Without a password and no object that can prove the identity of the owner of the household, this will cause great inconvenience to withdraw money.

Zhang Nan thought for a long time but still couldn't come up with a solution that could solve this problem well.

During dinner, Cui Yue seemed to see that Zhang Nan was having trouble, and then asked Zhang Nan what was going on. Zhang Nan also told Cui Yue in a simplified manner. After all, there was nothing to hide.

Unexpectedly, after Cui Yue heard Zhang Nan's troubles, she chuckled and said, "Mr. I usually think you are the smartest person in the world. Why are you confused now?"

When Zhang Nan heard Cui Yue say this, he was puzzled, and then asked, "Can you have any good methods, Yue'er?"

"Of course there is." Cui Yue said with a smile.

"If you have it, just say it quickly." Zhang Nan said.

"Isn't this simple? Langjun, do you remember the ID card you gave me there? Then, wouldn't it be enough to bring this thing with you when you deposit and withdraw money? Although our Tang Dynasty cannot be as advanced as yours, isn't it simple to provide a proof of identity?" Cui Yue looked at Zhang Nan and smiled.

After hearing this, Zhang Nan slapped his head. How could he forget this method?
Chapter completed!