According to news on December 23, Binance co-founder Changpeng Zhao tweeted yesterday, "Recently I have seen some people receiving cryptocurrency by accepting private keys or hardware wallets. This is a bad idea because the giver still has do not have access to these cryptocurrencies, they should transfer the cryptocurrencies to their own address, or better yet, just have the giver send it to an address they own. It's a bad idea to have two people accessing the same private key (or mnemonic) when these encryptions are moved ( or stolen by a hacker), it is almost impossible to prove who moved it (or was hacked)."