With a fast network and a smartphone, anyone who has passed the identity (身份) check can be an online teacher, and anyone with an online account can buy "pay for knowledge" products that he or she wants at an affordable price.

通过高速网络和智能手机，任何人通过身份核验后都可以成为一名线上教师，并且任何拥有线上账户的人都可以以实惠的价格购买自己需要的“知识付费”产品。

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On receiving this signed order, the online-trade server needs to validate the uniqueness of the nonce and check whether its identity is specified as the intended recipient.

一接收到经签名的订单，在线交易服务器就需要确认现时标志的唯一性，并检查其身份是否被指定为目标接收方。

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Members are asked to check each other's identity on their passports, and encouraged to verify their location by making a small credit card contribution to the site.

会员们被要求拿出他们的身份证验证，他们也被鼓励着用信用卡捐一小部分钱来确认他们的地址。

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Credit and debit card fraud has increased by 53% over the last two years, which is why banks sometimes check the identity of the card user if a transaction is taking place abroad.

BBC: Hotline combats card mix-ups

But although adding an extra identity check to such financial transactions improves security, doesn't it also add complexity and inconvenience?

ECONOMIST: Security

Mr. Merah was arrested by Afghan police during a routine identity check in Kandahar and put on a flight to Europe, prosecutors say.

WSJ: French Killer Mohamed Merah's Path to Jihadist Rampage