user5450: If challenged, I could do this on demand with an amount of the challenger's choosing, to 'prove' I have control of the funds.

user5406: Yes, it is possible to send to the same address. However, to prove control of an address, you could instead sign a message.

5450: <p>If challenged, I could do this on demand with an amount of the challenger's choosing, to 'prove' I have control of the funds.</p>
 5406: <p>Yes, it is possible to send to the same address. However, to prove control of an address, you could instead <a href="https://bitcoin.stackexchange.com/questions/3898/how-does-sign-message-work">sign a message</a>.</p>
