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I don’t know about different wallets or exchanges but my understanding is that if you hold eos on an ethereum address after the go live date, it will effectively be worthless unless you register it.

OK thanks for that.

The current EOS token is only a placeholder for your real EOS tokens when the platform launches in june 2018. Registering your tokens on the Ethereum platform allows them to swap you 1:1 for the real EOS token. They can't give you the real tokens if they can't find you. Hence, registering your tokens on the Ethereum platform is a must.