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Honestly, I am not sure about that. That is the one thing which is slightly confusing/bothering me. Somewhere it sounded like you could register your Steem public keys, but I have no idea why that would be necessary or beneficial.... It seems to me like you should only need the appropriate ETH addresses.

You can use steem or bitshares keys or our eos key generator

Thanks, Dan. I think there might be an issue with the register EOS key function on the test sale. When I just tried it, the screen briefly said "Generating key...", which then disappeared, and the screen still indicated no public EOS key registered.