I am test etherscan for getting token transactions, it shows up but the token name and token symbol show empty, and some token the token name and symbol shows but some not, all created long time ago. Is this a bug? Thanks
This is not a bug. Etherscan will only show information such as the token name, symbol, total supply etc. if a token contract adheres to the ERC20 specification and provides that information using the appropriate functions.
For example, for token 0xecf8f87f810ecf450940c9f60066b4a7a501d6a7, this does not appear to be the case. They don't provide the
symbol values as required by the specification, and are thus non-ERC20 compliant.