A method for transmitting data by a mobile device on behalf of a vehicle, the method comprising: obtaining , by the mobile device, vehicle capabilities associated with the vehicle, the vehicle capabilities indicating one or more sensors of the vehicle; determining , by the mobile device, mobile device capabilities indicating processing resources and/or one or more sensors of the mobile device; obtaining , by the mobile device from a credential authority, one or more transmission credentials for vehicle-to-everything transmissions based at least in part on the one or more sensors of the vehicle and based at least in part on the processing resources and/or one or more sensors of the mobile device, wherein obtaining the one or more transmission credentials comprises transmitting, to the credential authority, the vehicle capabilities that indicate the one or more sensors of the vehicle, the mobile device capabilities that indicate the processing resources and/or one or more sensors of the mobile device, and a public key generated by the mobile device, wherein the one or more transmission credentials are obtained conditional on the one or more sensors of the vehicle and the processing resources and/or one or more sensors of the mobile device satisfying transmission threshold requirements, wherein the obtained one or more transmission credentials comprise the public key generated by the mobile device as encrypted with a private key associated with the credential authority; and in response to obtaining the one or more transmission credentials for vehicle-to-everything transmissions, transmitting , by the mobile device via one or more transceivers, one or more data messages on behalf of the vehicle utilizing the one or more transmission credentials. obtaining , by the mobile device, vehicle capabilities associated with the vehicle, the vehicle capabilities indicating one or more sensors of the vehicle; determining , by the mobile device, mobile device capabilities indicating processing resources and/or one or more sensors of the mobile device; obtaining , by the mobile device from a credential authority, one or more transmission credentials for vehicle-to-everything transmissions based at least in part on the one or more sensors of the vehicle and based at least in part on the processing resources and/or one or more sensors of the mobile device, wherein obtaining the one or more transmission credentials comprises transmitting, to the credential authority, the vehicle capabilities that indicate the one or more sensors of the vehicle, the mobile device capabilities that indicate the processing resources and/or one or more sensors of the mobile device, and a public key generated by the mobile device, wherein the one or more transmission credentials are obtained conditional on the one or more sensors of the vehicle and the processing resources and/or one or more sensors of the mobile device satisfying transmission threshold requirements, wherein the obtained one or more transmission credentials comprise the public key generated by the mobile device as encrypted with a private key associated with the credential authority; and in response to obtaining the one or more transmission credentials for vehicle-to-everything transmissions, transmitting , by the mobile device via one or more transceivers, one or more data messages on behalf of the vehicle utilizing the one or more transmission credentials. <EOS>