The only way I can think of to transfer a good reputation from the physical, non-anonymous world to the anonymous online one, while minimizing the effort to build it and without having to reveal my anonymity to even a limited group of people, is to maintain and use the same natural behavior and attitude that brought me a good reputation in the digital world. Naturalness will ensure that my efforts are minimized and if it is respectful in the physical world, it will be successful in the online environment.