I regularly use blockchain.info's payment forwarding service (aka "receive payments API"). Do you guys know if it's possible to determine whether a given address is actually a forwading address and, if so, where it is forwarding to? I know there's a "Check Callback Response Log" feature (
http://blockchain.info/api/api_receive), but that only works when blockchain.info invoked the callback address and received a reply, which only happens once the address has been used (and also when the service works, which unfortunately doesn't happen 100% of time
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