We will be disabling deposits and withdrawals of Bitcoin (and all BTC related tokens) any time we deem necessary to ensure that all tokens stored on Poloniex remain safe. The length of any possible downtime is unknown as this is highly dependent on network stability. Our objective will be to bring the wallet back online and enable deposits and withdrawals as soon as we believe it is safe to do so. Trading will be unaffected during these periods.
At this time, we cannot commit to supporting any specific blockchain that may emerge if there is a blockchain split. Even if two viable blockchains emerge, we may or may not support both and will make such a decision only after we are satisfied that we can safely support either blockchain in an enterprise environment.
The “BTC” balance and trading activity you see on Gemini will likely reflect the chain with the greater total difficulty.
We may choose to eventually open new order books for the chain with less total difficulty.
We will make every effort to support withdrawals of the chain with less total difficulty, if it ends up having a significant amount of hashpower, exchange volume, or economic value.
This means if there are two separate digital currencies — bitcoin (BTC) and bitcoin cash (BCC) — customers with Bitcoin stored on Coinbase will only have access to the current version of bitcoin we support (BTC). Customers will not have access to, or be able to withdraw, bitcoin cash (BCC).
In the event of a User Activated Hard Fork (UAHF) on 1 August or thereafter, it is important to clarify that Bitstamp would not be in a position to support Bitcoin Cash (BCC), the coin associated with the Bitcoin Cash proposal. In Bitstamp’s view, BCC is an alt-coin and the decision to list BCC tokens remains at our sole discretion at all times.
If Bitstamp chooses to list BCC, we would decide at our own discretion on what course of action to take with balances deriving from the hard fork.
BitMEX will not support the split or distribution of Bitcoin Cash, nor will BitMEX be liable for any Bitcoin Cash sent to BitMEX. Therefore, it is up to our users to withdraw from BitMEX prior to August 1st if they wish to access Bitcoin Cash tokens or any other hardfork.