@lukechampine about your vulnerability. Would you consider it's safe to send first little amount to make sure you have the right address? Do you consider that address reuse?
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Great question. First, sending a small amount first is a good idea in general, since it rules out many potential problems, and reusing an address once isn't a big deal. However, it will not prevent the attack I described.
What the attacker can do is "allow through" any transaction smaller than some threshold, and only "lock" the address when it receives more than that. So sending a test transaction may just give you a false sense of security.
