In response to receiving a second verification record of a second location and time at which a user is verified as present by a second internet of things (loT) device based on biometric input recognition, a proximity service maintains the second verification record in association with a user identifier only if travel between the second location and a first location previously recorded at a first time prior to the second time is feasible as determined by a mapping service. In response to receiving a verification request for verifying feasibility of the proximity of an authorized user of an account identifier at a third location at which the account identifier is presented with a transaction request and detecting the second verification record is maintained, the proximity service verifies the feasibility of the proximity of the authorized user as present at the third location in view of the second location and time.