A Digital Signature Purchase (DSP) is a process of authenticating an electronic document or digital transaction. This type of purchase typically involves the transfer of money and exchanging of information between a consumer and seller.

The main goal of DSPs is to ensure that only the consumer with their unique digital signature can authorise and verify their transactions. This helps to protect both parties from fraudulent activities like identity theft, unauthorised funds transfers or fraudulent payments. To complete a DSP, the consumer must provide additional security measures such as entering a password, providing biometric data or signing off on the transaction digitally. By using DSPs, businesses can guarantee that any deals they enter into are valid and legally binding.