Leashing is a proprietary Safetrust technology embedded in door readers that securely detects the presence of a mobile device with the Safetrust Wallet enabled. It automatically wakes up the application in the background to authenticate using a valid credential stored in the wallet.
Technically, this is achieved by configuring supported readers as "central" devices and mobile phones as "peripheral" devices. The phone remains idle until the reader scans for it, at which point it responds to the request, ensuring efficient and secure authentication while conserving battery life.