I think the most secure way is to just use Qora itself as in investors pm me the address they want to receive their share on.
+1
As for me I'll just sing a message with my qora address using btc investment address. I think it's the most secure way.
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∞I guess the safety concern is that out PM address could be compromised. If it was your plan still would not be perfect.
If i had access to your PM and account generally, which the moderators do here by the way. Then they know everything, including the btc address you sent on and probably the signature you used for your BTC address.
I'm absolutely no expert but surely sending a Qora address to Qora. Then he takes the list and puts it next to the BTC donations. Then give everyone a week to see that list, which gives people a chance to say if someone has sent a false address. Then Qora sends out.
Some people could make false claims and say oh that address is not right but they could be worked out by sending a small payment on their BTC address etc.
I think we need a fool proof and easy way, I'm sure we can sort this out. But with the recent holes found in windows and this forum being a harem of hackers we should go the 100% hacker proof way and assume the worst about access to our PM address. I mean someone needs only to hack a moderators address and all PM's are compromised.