Nice one bro, I find your information very useful. Though this post is old, I hope you can respond and on time (if alive...lolzz) We I have a thousand list of address I need to check their balance (all at once maybe with a code or script to load the TXT file and display their balances). Checking them one after the other on the blockchain is stressful and can take my time. The list is made up of its private keys in Hex format arranged like this:

             *BITCOIN ADDRESS*                                                   *PRIVATE KEY IN HEX*

112puGbENBwLroiyaMwtDPLBCkdbRLBJbd      3A7BE45E33DDDEA55FC278BAECCB6163D7E4266EEB6F43C1F1F3837C24815E9A
112r2gz5LjoEdUsB4KEYnpSVxkTa8v3q6m       7B8D2B9229078635D15413C444E71EBAAE0D168F0C343F8278D648A33DA2F700
112ruKBUtZLLeuhapCSeJQiEHxci1jXnWH        EECE8A447C32B88E279D258CCE80A030AE4B9161F96320B8AAB0FE2FE0852BAB

I hope you understand me. Thanks.