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Ethereum Merge, Derivatives Trading
Will the ETH index for both fixed and perpetual Derivatives continue as the PoS chain?
Yes. As the Proof of Stake upgrade has the majority support of the Ethereum community, the ETH index will continue as the Proof of Stake chain after the merge.
Will fixed maturity derivatives be settled to the PoS chain, PoW chain or a combination of both?
Fixed maturity contracts will be settled to the Proof of Stake chain. Any new Proof of Work asset arising from a fork after the merge will be treated as an entirely separate asset.
Will fixed maturity derivatives be settled on the merge date or at the usual settlement date?
Fixed maturity contracts will be settled on their usual settlement date.
How will you handle the ETH perpetual derivatives contracts? Will you settle it and start a new ETHPoS contract?
Due to the Proof of Stake upgrade having majority support of the Ethereum community, both ETH perpetual contracts will continue to trade as the upgraded Proof of Stake chain.
Will there be any changes to margin requirements for the currently-listed ETH contracts?
Kraken Derivatives reserve the right to update the margin schedule at any time without warning. However, we will endeavour to give as much notice as possible via platform notifications. Note that if there is not sufficient margin in a trader’s wallet to meet updated requirements, position(s) can be liquidated.
If the ETH PoW airdrop is supported on spot, will this include my Futures balances? 
If the ETH PoW airdrop is supported on spot, your ETH balance in your Derivatives account at time of the snapshot will be included. Your spot account would be credited based on the combined balance of your spot and Derivatives accounts at the time of the snapshot. Unrealised PnL on single-collateral inverse futures positions will be included in the snapshot.
Note: Unrealised PnL on multi-collateral positions with ETH as the PnL preference will be not be included.
For Derivatives balances, only Kraken Single Sign-On (SSO) accounts, or sub-accounts linked to a Kraken SSO accounts will be eligible in the event of an ETH PoW airdrop. Any legacy non-SSO futures account that is not linked to a Kraken SSO account will not be eligible.
For additional information on the Ethereum Merge, see Ethereum Merge, Staking and Trading FAQ

Updated 13-Sep-2022