i bought zilliqa in june 2020 .so does this mean they are mainnet zil ,rather than interim erc20 ?
where did you bought it, and in which wallet do you keep it?
if the wallet start with zil, it is mainnet coin, if wallet starts with 0x, then that is erc20 token
since you probably bought it on the exchange, than you can see in the token description on the exchange, but most probably that is mainnet coin