About Techrair

Techrair explains how everyday online services work: payments, promotional mechanics, security, and the infrastructure in between. The aim is to make the behaviour of these systems less surprising.

Conventions

• One system per page, described in the order things happen.
• References are linked where a definition or a standard is involved.
• Some pages point to examples on other sites, including sites in Chinese. Those sites are responsible for their own content, and a link is not an endorsement.
• Nothing here is security, legal or financial advice for your specific case.