user6039: How can you prevent bitcoins from unknown parties being transferred to any of your bitcoin addresses? if so, how? If not, why not?

user6987: No way. 
But you can detect what coins transferred from one address and what coins transferred from another.
Look for example at the first address in the network:
12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX
http://blockchain.info/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX
https://blockexplorer.com/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX
Nobody can stop people to send bitcoins to Satoshi's address, first bitcoin address in the network.

user85: Receiving Bitcoins is entirely passive. The receiver plays no part in the process whatsoever. There is no way to refuse a Bitcoin transaction, other than to transfer the Bitcoins back to the sender.

6039: <p>How can you prevent bitcoins from unknown parties being transferred to any of your bitcoin addresses? if so, how? If not, why not?</p>
 6987: <p>No way. </p>

<p>But you can detect what coins transferred from one address and what coins transferred from another.</p>

<p>Look for example at the first address in the network:</p>

<p>12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX</p>

<p><a href="http://blockchain.info/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX" rel="nofollow">http://blockchain.info/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX</a></p>

<p><a href="https://blockexplorer.com/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX" rel="nofollow">https://blockexplorer.com/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX</a></p>

<p>Nobody can stop people to send bitcoins to Satoshi's address, first bitcoin address in the network.</p>
 85: <p>Receiving Bitcoins is entirely passive. The receiver plays no part in the process whatsoever. There is no way to refuse a Bitcoin transaction, other than to transfer the Bitcoins back to the sender.</p>
