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No, i don'n send another Cryptocurrency address. I send my myetherwallet when I filled in the registration form Twitter bounty campaign for participation.
As long as you posted your Eth address, and you can sign a message from it, you can provide proof.
If you need help with signing a message read here:
https://bitcointalksearch.org/topic/how-to-sign-a-message-990345
Note: The wallets are for btc, but the same principal applies to other Cryptocurrency wallets.
You should be able to "right click" on the address and sign/verify message, or a "tab" on the
Menu.