A method and system for generating a log with location and accelerometer history and verifying the authenticity of the user based on the log. A stroke and capture module captures stroke data from a user. A location identifier module identifies the portable computing device's location. An accelerometer determines the portable computing device's acceleration. A logging module generates metadata that includes the location and accelerometer history. A verification module receives the location and the accelerometer history. The verification module determines the user's mode of transportation based on the accelerometer history. The location and the mode of transportation are compared with information from an authority. If the data matches, the verification authenticates the document.