How does etherscan know that a particular transaction is an ERC20 token transfer? If you look here: https://rinkeby.etherscan.io/tx/0xa8e4aa4f533e03bd8298f393d50d4ca41dba3368493c481e386d11389008353d etherscan knows that account A is transfering account B 200 tokens. IM quite familiar with quering ethereum using JSON RPC, so IM wondering if that info is there somewhere.
Thanks