user323: There are a few websites that use green addresses, but how can one go about implementing it using the standard Bitcoin API?

user1507: Green addresses are by convention, not by protocol.  You would need to publish an address and then sign a message with the corresponding private key that says, "I promise never to double-spend any coins from this address."  Then you'd need to convince others to believe your promise.

323: <p>There are a few websites that use <a href="https://en.bitcoin.it/wiki/Green_address" rel="nofollow">green addresses</a>, but how can one go about implementing it using the standard <a href="https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list" rel="nofollow">Bitcoin API</a>?</p>
 1507: <p>Green addresses are by convention, not by protocol.  You would need to publish an address and then sign a message with the corresponding private key that says, "I promise never to double-spend any coins from this address."  Then you'd need to convince others to believe your promise.</p>
