Quote from: phucthinh11061997 on February 20, 2018, 01:59:31 PM

Who knows if the balances_498754.csv file shared above contains the compressed or uncompressed format of the bitcoin public address?

It is impossible to know if a bitcoin address is made using a compressed or uncompressed public key. Every bitcoin address has many compressed and uncompressed public keys that will generate that address.
There are 2^160 possible addresses and 2^256 public keys, which makes about 2^96 different keys for each address

But you can make an educated guess based on the date when the address was created. During the last 3-4 years >99% of generated addresses would use compressed public keys. And the oldest ones would probably use uncompressed keys.

The only way to be certain is if there is a spend action from that address. then you can look at the published public key and you will know if it is compressed or not.