What only got me thinking is why would tezos and cosmos do an ICO this year because I think these two projects are not new anymore. What if these were the fake projects because we have lots of them right now that their names are identical to the original/reputed projects.
Cosmos (ATOM) had an ICO where the Token Sale event ended on
5 APRIL 2017 while Tezos had one where the token sale even ended on
13 JULY 2017The only reason I see why OP wants to sell the addresses that participated in the ICOs is because he's probably planning to scam. Otherwise, of what use are those addresses right now?
Maybe because there are potential aidrops coming from those wallets he held and he want to use that as a bait so that he can possibly get the balances of his possible buyers if they filled some of it. But I don't think that there are crazy people will buy used private key since we know how risky it is and chances for getting benefits is low or maybe we can say impossible.