user73701: How can I learn who has access the the address that my btc were incorrectly sent to? I look in btc.com and see that the btc was sent and completed, and unspent. It's just sitting somewhere on the blockchain? How can I contact the person who has access to the key? 

user69241: There is no way to find/contact that person.
You are acting pseudonymously in the bitcoin network. You don't know who owns the adress if the owner doesn't tell you that he/she is the owner.

73701: <p>How can I learn who has access the the address that my btc were incorrectly sent to? I look in btc.com and see that the btc was sent and completed, and unspent. It's just sitting somewhere on the blockchain? How can I contact the person who has access to the key? </p>
 69241: <p>There is no way to find/contact that person.</p>

<p>You are acting pseudonymously in the bitcoin network. You don't know who owns the adress if the owner doesn't tell you that he/she is the owner.</p>
