And how you know for sure that those public keys was in the 170 bit range? How to tell what range what a public key is in?
These pubkeys are interesting. All of them coresponds to uncompressed addresses, and for example the first 3 of them are:
13GUJutC6GKgJQTcGzCtznDDYFQKVJFVwp
13Sa73PU9Ar5sE4SdFcBdbg9ntbNcMQhaA
14k4GhqA1svNZPbssdAjgdnfzWTpAigZVH
The input transactions to them were in May 2011, and released only this year in September 2019 (amounts 147BTC, 122BTC and 147BTC).
But why
drotika combined these pubkeys saying that they are 170bit?