If an account had ETH before the DAO-fork does the ETH now not exist on both the ETH and the ETC chains?
A Poloniex notice says "All users who had an Ethereum balance at the moment of the fork now have a matching balance of ETC". It seems that if the ETC chain lives, then account holders can spend and trade on two chains. Effectively, is it possible to transfer your ETH balance to someone else on the ETC chain, and have it remain in your ETH account on the main ETH chain?
We also have a couple of posts referencing this:
Step 2: Send funds to Poloniex. Generate an ETH deposit address or use an existing one. Then send a test transaction (for example 1ETH) to this address. You should be credited ETH and the same amount of ETC. If so go ahead and send the rest of the ETH.
Can someone please help explain whether a double spending issue exists?